update: add leftbar to app

This is nice for deployments

base/src/expressions/parser/mod.rs

@@ -717,7 +717,7 @@ impl Parser {
                         return Node::ParseErrorKind {
                             formula: self.lexer.get_formula(),
                             position: 0,
-                            message: "sheet not found".to_string(),
+                            message: format!("sheet not found: {}", context.sheet),
                         };
                     }
                 };
@@ -850,7 +850,7 @@ impl Parser {
                         return Node::ParseErrorKind {
                             formula: self.lexer.get_formula(),
                             position: 0,
-                            message: "sheet not found".to_string(),
+                            message: format!("sheet not found: {}", context.sheet),
                         };
                     }
                 };
@@ -878,7 +878,7 @@ impl Parser {
                         return Node::ParseErrorKind {
                             formula: self.lexer.get_formula(),
                             position: 0,
-                            message: "sheet not found".to_string(),
+                            message: format!("table sheet not found: {}", table.sheet_name),
                         };
                     }
                 };

base/src/functions/logical.rs

@@ -246,7 +246,7 @@ impl Model {
         }
         // None of the cases matched so we return the default
         // If there is an even number of args is the last one otherwise is #N/A
-        if args_count % 2 == 0 {
+        if args_count.is_multiple_of(2) {
             return self.evaluate_node_in_context(&args[args_count - 1], cell);
         }
         CalcResult::Error {
@@ -262,7 +262,7 @@ impl Model {
         if args_count < 2 {
             return CalcResult::new_args_number_error(cell);
         }
-        if args_count % 2 != 0 {
+        if !args_count.is_multiple_of(2) {
             // Missing value for last condition
             return CalcResult::new_args_number_error(cell);
         }

base/src/functions/statistical.rs

@@ -350,7 +350,7 @@ impl Model {
     // FIXME: This function shares a lot of code with apply_ifs. Can we merge them?
     pub(crate) fn fn_countifs(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
         let args_count = args.len();
-        if args_count < 2 || args_count % 2 == 1 {
+        if args_count < 2 || !args_count.is_multiple_of(2) {
             return CalcResult::new_args_number_error(cell);
         }
 
@@ -476,7 +476,7 @@ impl Model {
         F: FnMut(f64),
     {
         let args_count = args.len();
-        if args_count < 3 || args_count % 2 == 0 {
+        if args_count < 3 || args_count.is_multiple_of(2) {
             return Err(CalcResult::new_args_number_error(cell));
         }
         let arg_0 = self.evaluate_node_in_context(&args[0], cell);

bindings/nodejs/README.md

@@ -4,14 +4,19 @@
 Example usage:
 
 ```javascript
-import { Model } from '@ironcalc/wasm';
+import { Model } from '@ironcalc/nodejs';
  
 const model = new Model("Workbook1", "en", "UTC");
 
 model.setUserInput(0, 1, 1, "=1+1");
-const result1 = model.getFormattedCellValue(0, 1, 1);
 
-console.log('Cell value', result1);
+const result1 = model.getFormattedCellValue(0, 1, 1);
+console.log('Cell value', result1); // "#ERROR"
+
+model.evaluate();
+
+const resultAfterEvaluate = model.getFormattedCellValue(0, 1, 1);
+console.log('Cell value', resultAfterEvaluate); // 2
 
 let result2 = model.getCellStyle(0, 1, 1);
 console.log('Cell style', result2);

docs/src/features/value-types.md

@@ -67,3 +67,7 @@ Using IronCalc, a complex number is a string of the form "1+j3".
 "#N/A" => #N/A
 
 ## Arrays
+
+## References
+
+A reference is a pointer to a single cell or a range of cells. The reference can either be entered manually, for example "A4", or as the result of a calculation, such as the OFFSET Function or the INDIRECT Function. A reference can also be built, for example with the Colon (\:) Operator. 

docs/src/functions/lookup-and-reference.md

@@ -16,7 +16,7 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
 | CHOOSE       | <Badge type="tip" text="Available" />          | –             |
 | CHOOSECOLS   | <Badge type="info" text="Not implemented yet" /> | –             |
 | CHOOSEROWS   | <Badge type="info" text="Not implemented yet" /> | –             |
-| COLUMN       | <Badge type="tip" text="Available" />          | –             |
+| COLUMN       | <Badge type="tip" text="Available" />          | [COLUMN](lookup_and_reference/column)             |
 | COLUMNS      | <Badge type="tip" text="Available" />          | –             |
 | DROP         | <Badge type="info" text="Not implemented yet" /> | –             |
 | EXPAND       | <Badge type="info" text="Not implemented yet" /> | –             |

docs/src/functions/lookup_and_reference/column.md

@@ -4,8 +4,28 @@ outline: deep
 lang: en-US
 ---
 
-# COLUMN
-
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::
+# COLUMN function
+## Overview
+The COLUMN Function in IronCalc is a lookup & reference formula that is used to query and return the column number of a referenced Column or Cell.
+## Usage
+### Syntax
+**COLUMN(<span title="Reference" style="color:#1E88E5">reference</span>) => <span title="Number" style="color:#1E88E5">column</span>**
+### Argument descriptions
+* *reference* ([cell](/features/value-types#references), [optional](/features/optional-arguments.md)). The number of the cell you wish to reference the column number of.
+### Additional guidance
+* When referencing a range of cells, only the column number of the left most cell will be returned.
+* You are also able to reference complete columns instead of individual cells.
+### Returned value
+COLUMN returns the [number](/features/value-types#numbers) of the specific cell or column which is being referenced.
+### Error conditions
+* IronCalc currently does not support the referencing of cells with names.
+## Details
+The COLUMN Function can only be used to display the correlating number of a single column within a Sheet. If you wish to show the number of columns used within a specific range, you can use the COLUMNS Function.
+## Examples
+### No Cell Reference
+When no cell reference is made, the formula uses **=COLUMN()**. This will then output the column number of the cell where the formula is placed.<br><br>For example, if the formula is placed in cell A1, then "1" will be displayed.
+### With Cell Reference
+When a cell reference is made, the formula uses **=COLUMN([Referenced Cell])**. This will then output the column number of the referenced cell, regardless of where the formula is placed in the sheet.<br><br>For example, if the cell B1 is the referenced cell, "2" will be the output of the formula no matter where it is placed in the sheet.<br><br>**Note:** references do not always have to be specific cells, you can also reference complete columns. For example, **=COLUMN(B:B)** would also result in an output of "2".
+### Range References
+The COLUMN function can also be used to reference a range of Cells or Columns. In this case only the most left-hand column will be the resulting output.<br><br>For example, **=COLUMN(A1:J1)** will result in the ouput of "1".
+## Links

docs/src/functions/math-and-trigonometry.md

@@ -13,16 +13,16 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
 | --------------- | ---------------------------------------------- | ------------- |
 | ABS             | <Badge type="tip" text="Available" />          | –             |
 | ACOS            | <Badge type="tip" text="Available" />          | [ACOS](math_and_trigonometry/acos) |
-| ACOSH           | <Badge type="tip" text="Available" />          | –             |
+| ACOSH           | <Badge type="tip" text="Available" />          | [ACOSH](math_and_trigonometry/acosh) |
 | ACOT            | <Badge type="info" text="Not implemented yet" /> | –             |
 | ACOTH           | <Badge type="info" text="Not implemented yet" /> | –             |
 | AGGREGATE       | <Badge type="info" text="Not implemented yet" /> | –             |
 | ARABIC          | <Badge type="info" text="Not implemented yet" /> | –             |
 | ASIN            | <Badge type="tip" text="Available" />          | [ASIN](math_and_trigonometry/asin) |
-| ASINH           | <Badge type="tip" text="Available" />          | –             |
+| ASINH           | <Badge type="tip" text="Available" />          | [ASINH](math_and_trigonometry/asinh) |
 | ATAN            | <Badge type="tip" text="Available" />          | [ATAN](math_and_trigonometry/atan) |
-| ATAN2           | <Badge type="tip" text="Available" />          | –             |
-| ATANH           | <Badge type="tip" text="Available" />          | –             |
+| ATAN2           | <Badge type="tip" text="Available" />          | [ATAN2](math_and_trigonometry/atan2) |
+| ATANH           | <Badge type="tip" text="Available" />          | [ATANH](math_and_trigonometry/atanh) |
 | BASE            | <Badge type="info" text="Not implemented yet" /> | –             |
 | CEILING         | <Badge type="info" text="Not implemented yet" /> | –             |
 | CEILING.MATH    | <Badge type="info" text="Not implemented yet" /> | –             |
@@ -49,9 +49,9 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
 | ISO.CEILING     | <Badge type="info" text="Not implemented yet" /> | –             |
 | LCM             | <Badge type="info" text="Not implemented yet" /> | –             |
 | LET             | <Badge type="info" text="Not implemented yet" /> | –             |
-| LN              | <Badge type="info" text="Not implemented yet" /> | –             |
-| LOG             | <Badge type="info" text="Not implemented yet" /> | –             |
-| LOG10           | <Badge type="info" text="Not implemented yet" /> | –             |
+| LN              | <Badge type="info" text="Available" />           | –             |
+| LOG             | <Badge type="info" text="Available" />           | –             |
+| LOG10           | <Badge type="info" text="Available" />           | –             |
 | MDETERM         | <Badge type="info" text="Not implemented yet" /> | –             |
 | MINVERSE        | <Badge type="info" text="Not implemented yet" /> | –             |
 | MMULT           | <Badge type="info" text="Not implemented yet" /> | –             |
@@ -80,11 +80,11 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
 | SIN             | <Badge type="tip" text="Available" />          | [SIN](math_and_trigonometry/sin) |
 | SINH            | <Badge type="tip" text="Available" />          | [SINH](math_and_trigonometry/sinh) |
 | SQRT            | <Badge type="tip" text="Available" />          | –             |
-| SQRTPI          | <Badge type="info" text="Not implemented yet" /> | –             |
+| SQRTPI          | <Badge type="info" text="Available" />         | –             |
 | SUBTOTAL        | <Badge type="info" text="Not implemented yet" /> | –             |
 | SUM             | <Badge type="tip" text="Available" />          | –             |
 | SUMIF           | <Badge type="tip" text="Available" />          | –             |
-| SUMIFS          | <Badge type="info" text="Not implemented yet" /> | –             |
+| SUMIFS          | <Badge type="info" text="Available" />         | –             |
 | SUMPRODUCT      | <Badge type="info" text="Not implemented yet" /> | –             |
 | SUMSQ           | <Badge type="info" text="Not implemented yet" /> | –             |
 | SUMX2MY2        | <Badge type="info" text="Not implemented yet" /> | –             |

docs/src/functions/math_and_trigonometry/acosh.md

@@ -3,9 +3,40 @@ layout: doc
 outline: deep
 lang: en-US
 ---
+# ACOSH function
+## Overview
+ACOSH is a function of the Math and Trigonometry category that calculates the inverse hyperbolic cosine (hyperbolic arccosine) of a number, returning a non-negative value in the range [0, +∞).
+## Usage
+### Syntax
+**ACOSH(<span title="Number" style="color:#1E88E5">number</span>) => <span title="Number" style="color:#1E88E5">acosh</span>**
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The value whose hyperbolic arccosine is to be calculated. The value must be greater than or equal to 1.
 
-# ACOSH
+### Additional guidance
+The hyperbolic arccosine function is defined as:
 
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::
+$$
+\operatorname{acosh}(x) = \ln(x + \sqrt{x^2 - 1})
+$$
+
+### Returned value
+ACOSH returns a [number](/features/value-types#numbers) in the range [0, +∞) that is the hyperbolic arccosine of the specified value, expressed in radians.
+### Error conditions
+* In common with many other IronCalc functions, ACOSH propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then ACOSH returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then ACOSH returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the value of the *number* argument is less than 1, then ACOSH returns the [`#NUM!`](/features/error-types.md#num) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+## Details
+* The ACOSH function utilizes the *acosh()* method provided by the [Rust Standard Library](https://doc.rust-lang.org/std/).
+* The figure below illustrates the output of the ACOSH function for values $x \geq 1$ in the range [0, +∞).
+<center><img src="/functions/images/hyperbolicarccosine-curve.png" width="350" alt="Graph showing acosh(x) for x ≥ 1."></center>
+
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=acosh).
+
+## Links
+* For more information about inverse hyperbolic functions, visit Wikipedia's [Inverse hyperbolic functions](https://en.wikipedia.org/wiki/Inverse_hyperbolic_functions) page.
+* See also IronCalc's [COSH](/functions/math_and_trigonometry/cosh), [ASINH](/functions/math_and_trigonometry/asinh) and [ATANH](/functions/math_and_trigonometry/atanh) functions.
+* Visit Microsoft Excel's [ACOSH function](https://support.microsoft.com/en-us/office/acosh-function-e3992cc1-103f-4e72-9f04-624b9ef5ebfe) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093391) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/ACOSH) provide versions of the ACOSH function.

docs/src/functions/math_and_trigonometry/asinh.md

@@ -4,8 +4,36 @@ outline: deep
 lang: en-US
 ---
 
-# ASINH
+# ASINH function
+## Overview
+ASINH is a function of the Math and Trigonometry category that calculates the inverse hyperbolic sine (hyperbolic arcsine) of a number, returning the hyperbolic angle expressed in radians.
+## Usage
+### Syntax
+**ASINH(<span title="Number" style="color:#1E88E5">number</span>) => <span title="Number" style="color:#1E88E5">asinh</span>**
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The value whose inverse hyperbolic sine is to be calculated. 
+### Additional guidance
+The hyperbolic arcsine function is defined as:
+$$
+\operatorname{asinh}(x) = \ln\!\left(x + \sqrt{x^2 + 1}\,\right)
+$$
+### Returned value
+ASINH returns a real [number](/features/value-types#numbers) in the range (-∞, +∞) that is the hyperbolic arcsine of the specified value, expressed in radians.
+### Error conditions
+* In common with many other IronCalc functions, ASINH propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then ASINH returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then ASINH returns the [`#VALUE!`](/features/error-types.md#value) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+## Details
+* The ASINH function utilizes the *asinh()* method provided by the [Rust Standard Library](https://doc.rust-lang.org/std/).
+* The figure below illustrates the output of the ASINH function.
+<center><img src="/functions/images/hyperbolicarcsine-curve.png" width="350" alt="Graph showing asinh(x)."></center>
 
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=asinh).
+
+## Links
+* For more information about inverse hyperbolic functions, visit Wikipedia's [Inverse hyperbolic functions](https://en.wikipedia.org/wiki/Inverse_hyperbolic_functions) page.
+* See also IronCalc's [SINH](/functions/math_and_trigonometry/sinh), [ACOSH](/functions/math_and_trigonometry/acosh) and [ATANH](/functions/math_and_trigonometry/atanh) functions.
+* Visit Microsoft Excel's [ASINH function](https://support.microsoft.com/de-de/office/asinh-function-62b4f5b6-d9cc-4c17-9d04-aa5371806c74) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093393) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/ASINH) provide versions of the ASINH function.

docs/src/functions/math_and_trigonometry/atan2.md

@@ -4,8 +4,34 @@ outline: deep
 lang: en-US
 ---
 
-# ATAN2
+# ATAN2 function
+## Overview
+ATAN2 is a function of the Math and Trigonometry category that calculates the inverse tangent (arctangent) for the specified *x* and *y* coordinates. The arctangent returns the angle defined by the x-axis and a line defined by the origin and a point with coordinates (x,y). The returned angle is expressed in radians, in the range (-$\pi$, +$\pi$].
+## Usage
+### Syntax
+**ATAN2(<span title="Number" style="color:#1E88E5">x,y</span>) => <span title="Number" style="color:#1E88E5">atan2</span>**
+### Argument descriptions
+* *x* ([number](/features/value-types#numbers), required). Value of the x coordinate.
+* *y* ([number](/features/value-types#numbers), required). Value of the y coordinate.
+### Additional guidance
+If the returned value is positive, it represents a counterclockwise angle from the x-axis, while a negative value represents a clockwise angle.  
+ATAN2(x,y) is equivalent to ATAN(y/x), with the difference that the x argument in ATAN2 can be 0.
+### Returned value
+ATAN2 returns a number in radians in the range (-$\pi$, +$\pi$] that is the inverse tangent for the specified x and y coordinates.
+### Error conditions
+* In common with many other IronCalc functions, ATAN2 propagates errors that are found in its argument.
+* If no argument, or arguments other than 2, are supplied, then ATAN2 returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of either the *x* or *y* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then ATAN2 returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If both *x* and *y* are equal to 0, ATAN2 returns a [`#DIV/0!`](/features/error-types.md#div-0) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+## Details
+* The ATAN2 function utilizes the *atan2()* method provided by the [Rust Standard Library](https://doc.rust-lang.org/std/).
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=atan2).
+
+## Links
+* For more information about inverse trigonometric functions, visit Wikipedia's [Inverse trigonometric functions](https://en.wikipedia.org/wiki/Inverse_trigonometric_functions) page.
+* See also IronCalc's [ATAN](/functions/math_and_trigonometry/atan), [TAN](/functions/math_and_trigonometry/tan) and [ASIN](/functions/math_and_trigonometry/asin) functions.
+* Visit Microsoft Excel's [ATAN2 function](https://support.microsoft.com/en-us/office/atan2-function-51123ced-348c-416a-b2e2-833f7868569f) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093468) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/ATAN2) provide versions of the ATAN2 function.
 
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::

docs/src/functions/math_and_trigonometry/atanh.md

@@ -4,8 +4,37 @@ outline: deep
 lang: en-US
 ---
 
-# ATANH
+# ATANH function
+## Overview
+ATANH is a function of the Math and Trigonometry category that calculates the inverse hyperbolic tangent (hyperbolic arctangent) of a number in the range (-1, +1), returning the hyperbolic angle expressed in radians.
+## Usage
+### Syntax
+**ATANH(<span title="Number" style="color:#1E88E5">number</span>) => <span title="Number" style="color:#1E88E5">atanh</span>**
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The value whose inverse hyperbolic tangent is to be calculated, in the range (-1,+1).
+### Additional guidance
+The hyperbolic arctangent function is defined as:
+$$
+\operatorname{atanh}(x) = \tfrac{1}{2}\,\ln\!\left(\dfrac{1+x}{1-x}\right),\quad |x| < 1
+$$
+### Returned value
+ATANH returns a real [number](/features/value-types#numbers) in the range (-∞, +∞) that is the hyperbolic arctangent of the specified value, expressed in radians.
+### Error conditions
+* In common with many other IronCalc functions, ATANH propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then ATANH returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then ATANH returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the value of the *number* argument lies outside the domain (-1, +1), then ATANH returns the [`#NUM!`](/features/error-types.md#num) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+## Details
+* The ATANH function utilizes the *atanh()* method provided by the [Rust Standard Library](https://doc.rust-lang.org/std/).
+* The figure below illustrates the output of the ATANH function.
+<center><img src="/functions/images/hyperbolicarctangent-curve.png" width="350" alt="Graph showing atanh(x)."></center>
 
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=atanh).
+
+## Links
+* For more information about inverse hyperbolic functions, visit Wikipedia's [Inverse hyperbolic functions](https://en.wikipedia.org/wiki/Inverse_hyperbolic_functions) page.
+* See also IronCalc's [ASINH](/functions/math_and_trigonometry/asinh), [ACOSH](/functions/math_and_trigonometry/acosh) and [TANH](/functions/math_and_trigonometry/tanh) functions.
+* Visit Microsoft Excel's [ATANH function](https://support.microsoft.com/de-de/office/atanh-function-453534d1-76a5-4f17-8c04-c3f2feee0dd5) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093397) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/ATANH) provide versions of the ATANH function.

docs/src/functions/math_and_trigonometry/ln.md

@@ -7,6 +7,5 @@ lang: en-US
 # LN
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
 :::

docs/src/functions/math_and_trigonometry/log.md

@@ -7,6 +7,5 @@ lang: en-US
 # LOG
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
 :::

docs/src/functions/math_and_trigonometry/log10.md

@@ -7,6 +7,5 @@ lang: en-US
 # LOG10
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
 :::

webapp/app.ironcalc.com/frontend/src/App.tsx

@@ -2,6 +2,7 @@ import "./App.css";
 import styled from "@emotion/styled";
 import { useEffect, useState } from "react";
 import { FileBar } from "./components/FileBar";
+import LeftDrawer from "./components/LeftDrawer/LeftDrawer";
 import {
   get_documentation_model,
   get_model,
@@ -9,7 +10,10 @@ import {
 } from "./components/rpc";
 import {
   createNewModel,
+  deleteModelByUuid,
   deleteSelectedModel,
+  // getModelsMetadata,
+  // getSelectedUuid,
   loadModelFromStorageOrCreate,
   saveModelToStorage,
   saveSelectedModelInStorage,
@@ -21,6 +25,7 @@ import { IronCalc, IronCalcIcon, Model, init } from "@ironcalc/workbook";
 
 function App() {
   const [model, setModel] = useState<Model | null>(null);
+  const [isDrawerOpen, setIsDrawerOpen] = useState(false);
 
   useEffect(() => {
     async function start() {
@@ -79,48 +84,80 @@ function App() {
   // We could use context for model, but the problem is that it should initialized to null.
   // Passing the property down makes sure it is always defined.
 
-  return (
-    <Wrapper>
-      <FileBar
-        model={model}
-        onModelUpload={async (arrayBuffer: ArrayBuffer, fileName: string) => {
-          const blob = await uploadFile(arrayBuffer, fileName);
-
-          const bytes = new Uint8Array(await blob.arrayBuffer());
-          const newModel = Model.from_bytes(bytes);
-          saveModelToStorage(newModel);
-
+  // Handlers for model changes that also update our models state
+  const handleNewModel = () => {
+    const newModel = createNewModel();
     setModel(newModel);
-        }}
-        newModel={() => {
-          setModel(createNewModel());
-        }}
-        setModel={(uuid: string) => {
+  };
+
+  const handleSetModel = (uuid: string) => {
     const newModel = selectModelFromStorage(uuid);
     if (newModel) {
       setModel(newModel);
     }
-        }}
-        onDelete={() => {
+  };
+
+  const handleDeleteModel = () => {
     const newModel = deleteSelectedModel();
     if (newModel) {
       setModel(newModel);
     }
+  };
+
+  const handleDeleteModelByUuid = (uuid: string) => {
+    const newModel = deleteModelByUuid(uuid);
+    if (newModel) {
+      setModel(newModel);
+    }
+  };
+
+  return (
+    <AppContainer>
+      <LeftDrawer
+        open={isDrawerOpen}
+        onClose={() => setIsDrawerOpen(false)}
+        newModel={handleNewModel}
+        setModel={handleSetModel}
+        onDelete={handleDeleteModelByUuid}
+      />
+
+      <MainContent isDrawerOpen={isDrawerOpen}>
+        <FileBar
+          model={model}
+          onModelUpload={async (arrayBuffer: ArrayBuffer, fileName: string) => {
+            const blob = await uploadFile(arrayBuffer, fileName);
+            const bytes = new Uint8Array(await blob.arrayBuffer());
+            const newModel = Model.from_bytes(bytes);
+            saveModelToStorage(newModel);
+            setModel(newModel);
           }}
+          newModel={handleNewModel}
+          setModel={handleSetModel}
+          onDelete={handleDeleteModel}
+          isDrawerOpen={isDrawerOpen}
+          setIsDrawerOpen={setIsDrawerOpen}
         />
         <IronCalc model={model} />
-    </Wrapper>
+      </MainContent>
+    </AppContainer>
   );
 }
 
-const Wrapper = styled("div")`
-  margin: 0px;
-  padding: 0px;
+const AppContainer = styled("div")`
+  display: flex;
   width: 100%;
   height: 100%;
+  position: relative;
+  overflow: hidden;
+`;
+
+const MainContent = styled("div")<{ isDrawerOpen: boolean }>`
+  margin-left: ${({ isDrawerOpen }) => (isDrawerOpen ? "0px" : "-264px")};
+  transition: margin-left 0.3s ease;
+  width: ${({ isDrawerOpen }) =>
+    isDrawerOpen ? "calc(100% - 264px)" : "100%"};
   display: flex;
   flex-direction: column;
-  position: absolute;
 `;
 
 const Loading = styled("div")`

webapp/app.ironcalc.com/frontend/src/components/DeleteWorkbookDialog.tsx

@@ -12,19 +12,9 @@ function DeleteWorkbookDialog(properties: DeleteWorkbookDialogProperties) {
   const deleteButtonRef = useRef<HTMLButtonElement>(null);
 
   useEffect(() => {
-    const root = document.getElementById("root");
-    if (root) {
-      root.style.filter = "blur(2px)";
-    }
     if (deleteButtonRef.current) {
       deleteButtonRef.current.focus();
     }
-    return () => {
-      const root = document.getElementById("root");
-      if (root) {
-        root.style.filter = "none";
-      }
-    };
   }, []);
 
   return (

webapp/app.ironcalc.com/frontend/src/components/FileBar.tsx

@@ -1,9 +1,9 @@
 import styled from "@emotion/styled";
 import type { Model } from "@ironcalc/workbook";
-import { IronCalcIcon, IronCalcLogo } from "@ironcalc/workbook";
+import { Button, IconButton } from "@mui/material";
+import { PanelLeftClose, PanelLeftOpen } from "lucide-react";
 import { useLayoutEffect, useRef, useState } from "react";
-import { FileMenu } from "./FileMenu";
-import { HelpMenu } from "./HelpMenu";
+import { DesktopMenu, MobileMenu } from "./FileMenu";
 import { ShareButton } from "./ShareButton";
 import ShareWorkbookDialog from "./ShareWorkbookDialog";
 import { WorkbookTitle } from "./WorkbookTitle";
@@ -30,6 +30,8 @@ export function FileBar(properties: {
   setModel: (key: string) => void;
   onModelUpload: (blob: ArrayBuffer, fileName: string) => Promise<void>;
   onDelete: () => void;
+  isDrawerOpen: boolean;
+  setIsDrawerOpen: (open: boolean) => void;
 }) {
   const [isDialogOpen, setIsDialogOpen] = useState(false);
   const spacerRef = useRef<HTMLDivElement>(null);
@@ -45,24 +47,49 @@ export function FileBar(properties: {
     }
   }, [width]);
 
-  return (
-    <FileBarWrapper>
-      <StyledDesktopLogo />
-      <StyledIronCalcIcon />
-      <Divider />
-      <FileMenu
-        newModel={properties.newModel}
-        setModel={properties.setModel}
-        onModelUpload={properties.onModelUpload}
-        onDownload={async () => {
+  // Common handler functions for both menu types
+  const handleDownload = async () => {
     const model = properties.model;
     const bytes = model.toBytes();
     const fileName = model.getName();
     await downloadModel(bytes, fileName);
-        }}
+  };
+
+  return (
+    <FileBarWrapper>
+      <DrawerButton
+        $isDrawerOpen={properties.isDrawerOpen}
+        onClick={() => properties.setIsDrawerOpen(!properties.isDrawerOpen)}
+        disableRipple
+        title="Toggle sidebar"
+      >
+        {properties.isDrawerOpen ? <PanelLeftClose /> : <PanelLeftOpen />}
+      </DrawerButton>
+      <DesktopButtonsWrapper>
+        <DesktopMenu
+          newModel={properties.newModel}
+          setModel={properties.setModel}
+          onModelUpload={properties.onModelUpload}
+          onDownload={handleDownload}
           onDelete={properties.onDelete}
         />
-      <HelpMenu />
+        <FileBarButton
+          disableRipple
+          onClick={() => window.open("https://docs.ironcalc.com", "_blank")}
+        >
+          Help
+        </FileBarButton>
+      </DesktopButtonsWrapper>
+      <MobileButtonsWrapper>
+        <MobileMenu
+          newModel={properties.newModel}
+          setModel={properties.setModel}
+          onModelUpload={properties.onModelUpload}
+          onDownload={handleDownload}
+          onDelete={properties.onDelete}
+        />
+      </MobileButtonsWrapper>
+      <Spacer ref={spacerRef} />
       <WorkbookTitleWrapper>
         <WorkbookTitle
           name={properties.model.getName()}
@@ -88,12 +115,8 @@ export function FileBar(properties: {
   );
 }
 
-// We want the workbook title to be exactly an the center of the page,
-// so we need an absolute position
 const WorkbookTitleWrapper = styled("div")`
-  position: absolute;
-  left: 50%;
-  transform: translateX(-50%);
+  position: relative;
 `;
 
 // The "Spacer" component occupies as much space as possible between the menu and the share button
@@ -101,38 +124,79 @@ const Spacer = styled("div")`
   flex-grow: 1;
 `;
 
-const StyledDesktopLogo = styled(IronCalcLogo)`
-  width: 120px;
-  margin-left: 12px;
-  @media (max-width: 769px) {
-    display: none;
+const DrawerButton = styled(IconButton)<{ $isDrawerOpen: boolean }>`
+  margin-left: 8px;
+  height: 32px;
+  width: 32px;
+  padding: 8px;
+  border-radius: 4px;
+  cursor: ${(props) => (props.$isDrawerOpen ? "w-resize" : "e-resize")};
+  svg {
+    stroke-width: 2px;
+    stroke: #757575;
+    width: 16px;
+    height: 16px;
   }
-`;
-
-const StyledIronCalcIcon = styled(IronCalcIcon)`
-  width: 36px;
-  margin-left: 10px;
-  @media (min-width: 769px) {
-    display: none;
+  &:hover {
+    background-color: #f2f2f2;
+  }
+  &:active {
+    background-color: #e0e0e0;
   }
-`;
-
-const Divider = styled("div")`
-  margin: 0px 8px 0px 16px;
-  height: 12px;
-  border-left: 1px solid #e0e0e0;
 `;
 
 // The container must be relative positioned so we can position the title absolutely
 const FileBarWrapper = styled("div")`
   position: relative;
   height: 60px;
+  min-height: 60px;
   width: 100%;
   background: #fff;
   display: flex;
   align-items: center;
   border-bottom: 1px solid #e0e0e0;
   justify-content: space-between;
+  box-sizing: border-box;
+`;
+
+const DesktopButtonsWrapper = styled("div")`
+  display: flex;
+  gap: 4px;
+  margin-left: 8px;
+  @media (max-width: 600px) {
+    display: none;
+  }
+`;
+
+const MobileButtonsWrapper = styled("div")`
+  display: flex;
+  gap: 4px;
+  @media (min-width: 601px) {
+    display: none;
+  }
+  @media (max-width: 600px) {
+    display: flex;
+  }
+`;
+
+const FileBarButton = styled(Button)`
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  font-size: 12px;
+  height: 32px;
+  width: auto;
+  padding: 4px 8px;
+  font-weight: 400;
+  min-width: 0px;
+  text-transform: capitalize;
+  color: #333333;
+  &:hover {
+    background-color: #f2f2f2;
+  }
+  &:active {
+    background-color: #e0e0e0;
+  }
 `;
 
 const DialogContainer = styled("div")`

webapp/app.ironcalc.com/frontend/src/components/FileMenu.tsx

@@ -1,93 +1,165 @@
 import styled from "@emotion/styled";
-import { Menu, MenuItem, Modal } from "@mui/material";
-import { Check, FileDown, FileUp, Plus, Trash2 } from "lucide-react";
+import { Button, IconButton, Menu, MenuItem, Modal } from "@mui/material";
+import {
+  ChevronRight,
+  EllipsisVertical,
+  FileDown,
+  FileUp,
+  Plus,
+  Trash2,
+} from "lucide-react";
 import { useRef, useState } from "react";
 import DeleteWorkbookDialog from "./DeleteWorkbookDialog";
 import UploadFileDialog from "./UploadFileDialog";
 import { getModelsMetadata, getSelectedUuid } from "./storage";
 
+export function DesktopMenu(props: {
+  newModel: () => void;
+  setModel: (key: string) => void;
+  onDownload: () => void;
+  onModelUpload: (blob: ArrayBuffer, fileName: string) => Promise<void>;
+  onDelete: () => void;
+}) {
+  const [isFileMenuOpen, setFileMenuOpen] = useState(false);
+  const anchorElement = useRef<HTMLButtonElement>(
+    null as unknown as HTMLButtonElement,
+  );
+
+  return (
+    <>
+      <FileBarButton
+        onClick={(): void => setFileMenuOpen(!isFileMenuOpen)}
+        ref={anchorElement}
+        disableRipple
+        isOpen={isFileMenuOpen}
+      >
+        File
+      </FileBarButton>
+      <FileMenu
+        newModel={props.newModel}
+        setModel={props.setModel}
+        onDownload={props.onDownload}
+        onModelUpload={props.onModelUpload}
+        onDelete={props.onDelete}
+        isFileMenuOpen={isFileMenuOpen}
+        setFileMenuOpen={setFileMenuOpen}
+        setMobileMenuOpen={() => {}}
+        anchorElement={anchorElement}
+      />
+    </>
+  );
+}
+
+export function MobileMenu(props: {
+  newModel: () => void;
+  setModel: (key: string) => void;
+  onDownload: () => void;
+  onModelUpload: (blob: ArrayBuffer, fileName: string) => Promise<void>;
+  onDelete: () => void;
+}) {
+  const [isMobileMenuOpen, setMobileMenuOpen] = useState(false);
+  const [isFileMenuOpen, setFileMenuOpen] = useState(false);
+  const anchorElement = useRef<HTMLButtonElement>(
+    null as unknown as HTMLButtonElement,
+  );
+  const [fileMenuAnchorEl, setFileMenuAnchorEl] = useState<HTMLElement | null>(
+    null,
+  );
+
+  return (
+    <>
+      <MenuButton
+        onClick={(): void => setMobileMenuOpen(true)}
+        ref={anchorElement}
+        disableRipple
+      >
+        <EllipsisVertical />
+      </MenuButton>
+      <StyledMenu
+        open={isMobileMenuOpen}
+        onClose={(): void => setMobileMenuOpen(false)}
+        anchorEl={anchorElement.current}
+      >
+        <MenuItemWrapper
+          onClick={(event) => {
+            setFileMenuOpen(true);
+            setFileMenuAnchorEl(event.currentTarget);
+          }}
+          disableRipple
+        >
+          <MenuItemText>File</MenuItemText>
+          <ChevronRight />
+        </MenuItemWrapper>
+        <MenuDivider />
+        <MenuItemWrapper
+          onClick={() => {
+            window.open("https://docs.ironcalc.com", "_blank");
+            setMobileMenuOpen(false);
+          }}
+          disableRipple
+        >
+          <MenuItemText>Help</MenuItemText>
+        </MenuItemWrapper>
+      </StyledMenu>
+      <FileMenu
+        newModel={props.newModel}
+        setModel={props.setModel}
+        onDownload={props.onDownload}
+        onModelUpload={props.onModelUpload}
+        onDelete={props.onDelete}
+        isFileMenuOpen={isFileMenuOpen}
+        setFileMenuOpen={setFileMenuOpen}
+        setMobileMenuOpen={setMobileMenuOpen}
+        anchorElement={anchorElement}
+      />
+    </>
+  );
+}
+
 export function FileMenu(props: {
   newModel: () => void;
   setModel: (key: string) => void;
   onDownload: () => void;
   onModelUpload: (blob: ArrayBuffer, fileName: string) => Promise<void>;
   onDelete: () => void;
+  isFileMenuOpen: boolean;
+  setFileMenuOpen: (open: boolean) => void;
+  setMobileMenuOpen: (open: boolean) => void;
+  anchorElement: React.RefObject<HTMLButtonElement>;
 }) {
-  const [isMenuOpen, setMenuOpen] = useState(false);
   const [isImportMenuOpen, setImportMenuOpen] = useState(false);
-  const anchorElement = useRef<HTMLButtonElement>(null);
   const models = getModelsMetadata();
-  const uuids = Object.keys(models);
   const selectedUuid = getSelectedUuid();
   const [isDeleteDialogOpen, setDeleteDialogOpen] = useState(false);
 
-  const elements = [];
-  for (const uuid of uuids) {
-    elements.push(
-      <MenuItemWrapper
-        key={uuid}
-        onClick={() => {
-          props.setModel(uuid);
-          setMenuOpen(false);
-        }}
-      >
-        <CheckIndicator>
-          {uuid === selectedUuid ? (
-            <StyledIcon>
-              <Check />
-            </StyledIcon>
-          ) : (
-            ""
-          )}
-        </CheckIndicator>
-        <MenuItemText
-          style={{
-            maxWidth: "240px",
-            overflow: "hidden",
-            textOverflow: "ellipsis",
-          }}
-        >
-          {models[uuid]}
-        </MenuItemText>
-      </MenuItemWrapper>,
-    );
-  }
-
   return (
     <>
-      <FileMenuWrapper
-        type="button"
-        id="file-menu-button"
-        onClick={(): void => setMenuOpen(true)}
-        ref={anchorElement}
-        $isActive={isMenuOpen}
-        aria-haspopup="true"
-      >
-        File
-      </FileMenuWrapper>
-      <Menu
-        open={isMenuOpen}
-        onClose={(): void => setMenuOpen(false)}
-        anchorEl={anchorElement.current}
-        autoFocus={false}
-        disableRestoreFocus={true}
-        sx={{
-          "& .MuiPaper-root": { borderRadius: "8px", padding: "4px 0px" },
-          "& .MuiList-root": { padding: "0" },
-          transform: "translate(-4px, 4px)",
+      <StyledMenu
+        open={props.isFileMenuOpen}
+        onClose={(): void => props.setFileMenuOpen(false)}
+        anchorEl={props.anchorElement.current}
+        anchorOrigin={{
+          vertical: "bottom",
+          horizontal: "left",
         }}
-        slotProps={{
-          list: {
-            "aria-labelledby": "file-menu-button",
-            tabIndex: -1,
-          },
+        transformOrigin={{
+          vertical: "top",
+          horizontal: "left",
+        }}
+        // To prevent closing parent menu when interacting with submenu
+        onMouseLeave={() => {
+          if (!isImportMenuOpen && !isDeleteDialogOpen) {
+            props.setFileMenuOpen(false);
+          }
         }}
       >
         <MenuItemWrapper
           onClick={() => {
             props.newModel();
-            setMenuOpen(false);
+            props.setFileMenuOpen(false);
+            props.setMobileMenuOpen(false);
           }}
+          disableRipple
         >
           <StyledIcon>
             <Plus />
@@ -97,34 +169,41 @@ export function FileMenu(props: {
         <MenuItemWrapper
           onClick={() => {
             setImportMenuOpen(true);
-            setMenuOpen(false);
+            props.setFileMenuOpen(false);
+            props.setMobileMenuOpen(false);
           }}
+          disableRipple
         >
           <StyledIcon>
             <FileUp />
           </StyledIcon>
           <MenuItemText>Import</MenuItemText>
         </MenuItemWrapper>
-        <MenuItemWrapper onClick={props.onDownload}>
-          <StyledIcon>
-            <FileDown />
-          </StyledIcon>
+        <MenuItemWrapper
+          onClick={() => {
+            props.onDownload();
+            props.setMobileMenuOpen(false);
+          }}
+          disableRipple
+        >
+          <StyledFileDown />
           <MenuItemText>Download (.xlsx)</MenuItemText>
         </MenuItemWrapper>
+        <MenuDivider />
         <MenuItemWrapper
           onClick={() => {
             setDeleteDialogOpen(true);
-            setMenuOpen(false);
+            props.setFileMenuOpen(false);
+            props.setMobileMenuOpen(false);
           }}
+          disableRipple
         >
           <StyledIcon>
             <Trash2 />
           </StyledIcon>
           <MenuItemText>Delete workbook</MenuItemText>
         </MenuItemWrapper>
-        <MenuDivider />
-        {elements}
-      </Menu>
+      </StyledMenu>
       <Modal
         open={isImportMenuOpen}
         onClose={() => {
@@ -149,7 +228,7 @@ export function FileMenu(props: {
         <DeleteWorkbookDialog
           onClose={() => setDeleteDialogOpen(false)}
           onConfirm={props.onDelete}
-          workbookName={selectedUuid ? models[selectedUuid] : ""}
+          workbookName={selectedUuid ? models[selectedUuid]?.name || "" : ""}
         />
       </Modal>
     </>
@@ -167,7 +246,55 @@ const StyledIcon = styled.div`
   }
 `;
 
-const MenuDivider = styled.div`
+const MenuButton = styled(IconButton)`
+  height: 32px;
+  width: 32px;
+  padding: 8px;
+  border-radius: 4px;
+  svg {
+    stroke-width: 2px;
+    stroke: #757575;
+    width: 16px;
+    height: 16px;
+  }
+  &:hover {
+    background-color: #f2f2f2;
+  }
+  &:active {
+    background-color: #e0e0e0;
+  }
+`;
+
+const FileBarButton = styled(Button)<{ isOpen: boolean }>`
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  font-size: 12px;
+  height: 32px;
+  width: auto;
+  padding: 4px 8px;
+  font-weight: 400;
+  min-width: 0px;
+  text-transform: capitalize;
+  color: #333333;
+  background-color: ${({ isOpen }) => (isOpen ? "#f2f2f2" : "none")};
+  &:hover {
+    background-color: #f2f2f2;
+  }
+  &:active {
+    background-color: #e0e0e0;
+  }
+`;
+
+const StyledFileDown = styled(FileDown)`
+  width: 16px;
+  height: 16px;
+  color: #333333;
+  padding-right: 10px;
+`;
+
+
+const MenuDivider = styled("div")`
   width: 100%;
   margin: auto;
   margin-top: 4px;
@@ -178,6 +305,7 @@ const MenuDivider = styled.div`
 const MenuItemText = styled.div`
   color: #000;
   font-size: 12px;
+  flex-grow: 1;
 `;
 
 const MenuItemWrapper = styled(MenuItem)`
@@ -190,26 +318,19 @@ const MenuItemWrapper = styled(MenuItem)`
   border-radius: 4px;
   padding: 8px;
   height: 32px;
-`;
-
-const FileMenuWrapper = styled.button<{ $isActive: boolean }>`
-  display: flex;
-  align-items: center;
-  font-size: 12px;
-  font-family: Inter;
-  padding: 8px;
-  border-radius: 4px;
-  cursor: pointer;
-  background-color: ${(props) => (props.$isActive ? "#e6e6e6" : "transparent")};
-  border: none;
-  background: none;
-  &:hover {
-    background-color: #f2f2f2;
+  min-height: 32px;
+  svg {
+    width: 16px;
+    height: 16px;
   }
 `;
 
-const CheckIndicator = styled.span`
-  display: flex;
-  justify-content: center;
-  min-width: 26px;
+const StyledMenu = styled(Menu)`
+  .MuiPaper-root {
+    border-radius: 8px;
+    padding: 4px 0px;
+  },
+  .MuiList-root {
+    padding: 0;
+  },
 `;

webapp/app.ironcalc.com/frontend/src/components/LeftDrawer/DrawerContent.tsx

@@ -0,0 +1,29 @@
+import styled from "@emotion/styled";
+import WorkbookList from "./WorkbookList";
+
+interface DrawerContentProps {
+  setModel: (key: string) => void;
+  onDelete: (uuid: string) => void;
+}
+
+function DrawerContent(props: DrawerContentProps) {
+  const { setModel, onDelete } = props;
+
+  return (
+    <ContentContainer>
+      <WorkbookList setModel={setModel} onDelete={onDelete} />
+    </ContentContainer>
+  );
+}
+
+const ContentContainer = styled("div")`
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  padding: 16px 12px;
+  height: 100%;
+  overflow: scroll;
+  font-size: 12px;
+`;
+
+export default DrawerContent;

webapp/app.ironcalc.com/frontend/src/components/LeftDrawer/DrawerFooter.tsx

@@ -0,0 +1,71 @@
+import styled from "@emotion/styled";
+import { BookOpen } from "lucide-react";
+
+function DrawerFooter() {
+  return (
+    <StyledDrawerFooter>
+      <FooterLink
+        href="https://docs.ironcalc.com/"
+        target="_blank"
+        rel="noopener noreferrer"
+      >
+        <OpenBookIcon>
+          <BookOpen />
+        </OpenBookIcon>
+        <FooterLinkText>Documentation</FooterLinkText>
+      </FooterLink>
+    </StyledDrawerFooter>
+  );
+}
+
+const StyledDrawerFooter = styled("div")`
+  display: flex;
+  align-items: center;
+  padding: 12px;
+  justify-content: space-between;
+  max-height: 60px;
+  height: 60px;
+  border-top: 1px solid #e0e0e0;
+  box-sizing: border-box;
+`;
+
+const FooterLink = styled("a")`
+  display: flex;
+  gap: 8px;
+  justify-content: flex-start;
+  font-size: 14px;
+  width: 100%;
+  min-width: 172px;
+  border-radius: 8px;
+  padding: 8px 4px 8px 8px;
+  transition: gap 0.5s;
+  background-color: transparent;
+  color: #000;
+  text-decoration: none;
+  align-items: center;
+
+  &:hover {
+    background-color: #e0e0e0 !important;
+  }
+`;
+
+const OpenBookIcon = styled("div")`
+  height: 16px;
+  width: 16px;
+  svg {
+    height: 16px;
+    width: 16px;
+    stroke: #9e9e9e;
+  }
+`;
+
+const FooterLinkText = styled("div")`
+  color: #000;
+  font-size: 12px;
+  width: 100%;
+  max-width: 240px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+`;
+
+export default DrawerFooter;

webapp/app.ironcalc.com/frontend/src/components/LeftDrawer/DrawerHeader.tsx

@@ -0,0 +1,61 @@
+import styled from "@emotion/styled";
+import { IronCalcLogo } from "@ironcalc/workbook";
+import { IconButton } from "@mui/material";
+import { Plus } from "lucide-react";
+
+interface DrawerHeaderProps {
+  onNewModel: () => void;
+}
+
+function DrawerHeader({ onNewModel }: DrawerHeaderProps) {
+  return (
+    <HeaderContainer>
+      <StyledDesktopLogo />
+      <AddButton onClick={onNewModel} title="New workbook">
+        <PlusIcon />
+      </AddButton>
+    </HeaderContainer>
+  );
+}
+
+const HeaderContainer = styled("div")`
+  display: flex;
+  align-items: center;
+  padding: 12px 8px 12px 16px;
+  justify-content: space-between;
+  max-height: 60px;
+  min-height: 60px;
+  border-bottom: 1px solid #e0e0e0;
+  box-sizing: border-box;
+`;
+
+const StyledDesktopLogo = styled(IronCalcLogo)`
+  width: 120px;
+  height: 28px;
+`;
+
+const AddButton = styled(IconButton)`
+  background: none;
+  border: none;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 8px;
+  height: 32px;
+  width: 32px;
+  border-radius: 4px;
+  margin-left: 10px;
+  color: #333333;
+  stroke-width: 2px;
+  &:hover {
+    background-color: #e0e0e0;
+  }
+`;
+
+const PlusIcon = styled(Plus)`
+  width: 16px;
+  height: 16px;
+`;
+
+export default DrawerHeader;

webapp/app.ironcalc.com/frontend/src/components/LeftDrawer/LeftDrawer.tsx

@@ -0,0 +1,51 @@
+import styled from "@emotion/styled";
+import { Drawer } from "@mui/material";
+import DrawerContent from "./DrawerContent";
+import DrawerFooter from "./DrawerFooter";
+import DrawerHeader from "./DrawerHeader";
+
+interface LeftDrawerProps {
+  open: boolean;
+  onClose: () => void;
+  newModel: () => void;
+  setModel: (key: string) => void;
+  onDelete: (uuid: string) => void;
+}
+
+function LeftDrawer({
+  open,
+  onClose,
+  newModel,
+  setModel,
+  onDelete,
+}: LeftDrawerProps) {
+  return (
+    <DrawerWrapper
+      variant="persistent"
+      anchor="left"
+      open={open}
+      onClose={onClose}
+    >
+      <DrawerHeader onNewModel={newModel} />
+      <DrawerContent setModel={setModel} onDelete={onDelete} />
+
+      <DrawerFooter />
+    </DrawerWrapper>
+  );
+}
+
+const DrawerWrapper = styled(Drawer)`
+  width: 264px;
+  height: 100%;
+  flex-shrink: 0;
+  font-family: "Inter", sans-serif;
+
+  .MuiDrawer-paper {
+    width: 264px;
+    background-color: #f5f5f5;
+    overflow: hidden;
+    border-right: 1px solid #e0e0e0;
+  }
+`;
+
+export default LeftDrawer;

webapp/app.ironcalc.com/frontend/src/components/LeftDrawer/WorkbookList.tsx

@@ -0,0 +1,379 @@
+import styled from "@emotion/styled";
+import { Menu, MenuItem, Modal } from "@mui/material";
+import {
+  EllipsisVertical,
+  FileDown,
+  FileSpreadsheet,
+  Trash2,
+} from "lucide-react";
+import type React from "react";
+import { useEffect, useState } from "react";
+import DeleteWorkbookDialog from "../DeleteWorkbookDialog";
+import { downloadModel } from "../rpc";
+import {
+  getModelsMetadata,
+  getSelectedUuid,
+  selectModelFromStorage,
+} from "../storage";
+
+interface WorkbookListProps {
+  setModel: (key: string) => void;
+  onDelete: (uuid: string) => void;
+}
+
+function WorkbookList({ setModel, onDelete }: WorkbookListProps) {
+  const [menuAnchorEl, setMenuAnchorEl] = useState<null | HTMLElement>(null);
+  const [selectedWorkbookUuid, setSelectedWorkbookUuid] = useState<
+    string | null
+  >(null);
+  const [isDeleteDialogOpen, setIsDeleteDialogOpen] = useState(false);
+  const [workbookToDelete, setWorkbookToDelete] = useState<string | null>(null);
+  const [intendedSelection, setIntendedSelection] = useState<string | null>(
+    null,
+  );
+
+  const selectedUuid = getSelectedUuid();
+
+  // Clear intended selection when selectedUuid changes from outside
+  useEffect(() => {
+    if (intendedSelection && selectedUuid === intendedSelection) {
+      setIntendedSelection(null);
+    }
+  }, [selectedUuid, intendedSelection]);
+
+  const handleMenuOpen = (
+    event: React.MouseEvent<HTMLButtonElement>,
+    uuid: string,
+  ) => {
+    console.log("Menu open", uuid);
+    event.stopPropagation();
+    setSelectedWorkbookUuid(uuid);
+    setMenuAnchorEl(event.currentTarget);
+    setIntendedSelection(uuid);
+    setModel(uuid);
+  };
+
+  const handleMenuClose = () => {
+    console.log(
+      "Menu closing, selectedWorkbookUuid:",
+      selectedWorkbookUuid,
+      "intendedSelection:",
+      intendedSelection,
+    );
+    setMenuAnchorEl(null);
+    // If we have an intended selection, make sure it's still selected
+    if (intendedSelection && intendedSelection !== selectedUuid) {
+      console.log("Re-selecting intended workbook:", intendedSelection);
+      setModel(intendedSelection);
+    }
+    // Don't reset selectedWorkbookUuid here - we want to keep track of which workbook was selected
+    // The selectedWorkbookUuid will be used for download/delete operations
+  };
+
+  const handleDeleteClick = (uuid: string) => {
+    console.log("Delete workbook:", uuid);
+    setWorkbookToDelete(uuid);
+    setIsDeleteDialogOpen(true);
+    setIntendedSelection(null);
+    handleMenuClose();
+  };
+
+  const handleDeleteConfirm = () => {
+    if (workbookToDelete) {
+      onDelete(workbookToDelete);
+      setWorkbookToDelete(null);
+    }
+    setIsDeleteDialogOpen(false);
+  };
+
+  const handleDeleteCancel = () => {
+    setWorkbookToDelete(null);
+    setIsDeleteDialogOpen(false);
+  };
+
+  const handleDownload = async (uuid: string) => {
+    try {
+      const model = selectModelFromStorage(uuid);
+      if (model) {
+        const bytes = model.toBytes();
+        const fileName = model.getName();
+        await downloadModel(bytes, fileName);
+      }
+    } catch (error) {
+      console.error("Failed to download workbook:", error);
+    }
+  };
+
+  // Group workbooks by creation date
+  const groupWorkbooks = () => {
+    const now = Date.now();
+    const millisecondsInDay = 24 * 60 * 60 * 1000;
+    const millisecondsIn30Days = 30 * millisecondsInDay;
+
+    const modelsCreatedToday = [];
+    const modelsCreatedThisMonth = [];
+    const olderModels = [];
+    const modelsMetadata = getModelsMetadata();
+
+    for (const uuid in modelsMetadata) {
+      const createdAt = modelsMetadata[uuid].createdAt;
+      const age = now - createdAt;
+
+      if (age < millisecondsInDay) {
+        modelsCreatedToday.push(uuid);
+      } else if (age < millisecondsIn30Days) {
+        modelsCreatedThisMonth.push(uuid);
+      } else {
+        olderModels.push(uuid);
+      }
+    }
+
+    // Sort each group by creation timestamp (newest first)
+    const sortByNewest = (uuids: string[]) =>
+      uuids.sort(
+        (a, b) => modelsMetadata[b].createdAt - modelsMetadata[a].createdAt,
+      );
+
+    return {
+      modelsCreatedToday: sortByNewest(modelsCreatedToday),
+      modelsCreatedThisMonth: sortByNewest(modelsCreatedThisMonth),
+      olderModels: sortByNewest(olderModels),
+    };
+  };
+
+  const { modelsCreatedToday, modelsCreatedThisMonth, olderModels } =
+    groupWorkbooks();
+
+  const renderWorkbookItem = (uuid: string) => {
+    const isMenuOpen = menuAnchorEl !== null && selectedWorkbookUuid === uuid;
+    const isAnyMenuOpen = menuAnchorEl !== null;
+    const models = getModelsMetadata();
+    return (
+      <WorkbookListItem
+        key={uuid}
+        onClick={() => {
+          // Prevent clicking on list items when any menu is open
+          if (isAnyMenuOpen) {
+            return;
+          }
+          setModel(uuid);
+        }}
+        selected={uuid === selectedUuid}
+        disableRipple
+        style={{ pointerEvents: isAnyMenuOpen ? "none" : "auto" }}
+      >
+        <StorageIndicator>
+          <FileSpreadsheet />
+        </StorageIndicator>
+        <WorkbookListText>{models[uuid].name}</WorkbookListText>
+        <EllipsisButton
+          onClick={(e) => handleMenuOpen(e, uuid)}
+          isOpen={isMenuOpen}
+          onMouseDown={(e) => e.stopPropagation()}
+          style={{ pointerEvents: "auto" }}
+        >
+          <EllipsisVertical />
+        </EllipsisButton>
+      </WorkbookListItem>
+    );
+  };
+
+  const renderSection = (title: string, uuids: string[]) => {
+    if (uuids.length === 0) return null;
+
+    return (
+      <SectionContainer key={title}>
+        <SectionTitle>{title}</SectionTitle>
+        {uuids.map(renderWorkbookItem)}
+      </SectionContainer>
+    );
+  };
+
+  const models = getModelsMetadata();
+
+  return (
+    <>
+      {renderSection("Today", modelsCreatedToday)}
+      {renderSection("Last 30 Days", modelsCreatedThisMonth)}
+      {renderSection("Older", olderModels)}
+
+      <StyledMenu
+        anchorEl={menuAnchorEl}
+        open={Boolean(menuAnchorEl)}
+        onClose={handleMenuClose}
+        MenuListProps={{
+          dense: true,
+        }}
+        anchorOrigin={{
+          vertical: "bottom",
+          horizontal: "right",
+        }}
+        transformOrigin={{
+          vertical: "top",
+          horizontal: "right",
+        }}
+      >
+        <MenuItemWrapper
+          onClick={() => {
+            console.log(
+              "Download clicked, selectedWorkbookUuid:",
+              selectedWorkbookUuid,
+            );
+            if (selectedWorkbookUuid) {
+              handleDownload(selectedWorkbookUuid);
+            }
+            setIntendedSelection(null);
+            handleMenuClose();
+          }}
+          disableRipple
+        >
+          <FileDown />
+          Download (.xlsx)
+        </MenuItemWrapper>
+        <MenuDivider />
+        <MenuItemWrapper
+          selected={false}
+          onClick={() => {
+            if (selectedWorkbookUuid) {
+              handleDeleteClick(selectedWorkbookUuid);
+            }
+          }}
+          disableRipple
+        >
+          <Trash2 size={16} />
+          Delete workbook
+        </MenuItemWrapper>
+      </StyledMenu>
+
+      <Modal
+        open={isDeleteDialogOpen}
+        onClose={handleDeleteCancel}
+        aria-labelledby="delete-dialog-title"
+        aria-describedby="delete-dialog-description"
+      >
+        <DeleteWorkbookDialog
+          onClose={handleDeleteCancel}
+          onConfirm={handleDeleteConfirm}
+          workbookName={workbookToDelete ? models[workbookToDelete].name : ""}
+        />
+      </Modal>
+    </>
+  );
+}
+
+const StorageIndicator = styled("div")`
+  height: 16px;
+  width: 16px;
+  svg {
+    height: 16px;
+    width: 16px;
+    stroke: #9e9e9e;
+  }
+`;
+
+const EllipsisButton = styled("button")<{ isOpen: boolean }>`
+  background: none;
+  border: none;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 4px;
+  height: 24px;
+  width: 24px;
+  border-radius: 4px;
+  color: #333333;
+  stroke-width: 2px;
+  background-color: ${({ isOpen }) => (isOpen ? "#E0E0E0" : "none")};
+  opacity: ${({ isOpen }) => (isOpen ? "1" : "0.5")};
+  transition: opacity 0.3s, background-color 0.3s;
+  &:hover {
+    background: none;
+    opacity: 1;
+  }
+  &:active {
+    background: #bdbdbd;
+    opacity: 1;
+  }
+`;
+
+const WorkbookListItem = styled(MenuItem)<{ selected: boolean }>`
+  display: flex;
+  gap: 8px;
+  justify-content: flex-start;
+  font-size: 14px;
+  width: 100%;
+  min-width: 172px;
+  border-radius: 8px;
+  padding: 8px 4px 8px 8px;
+  height: 32px;
+  min-height: 32px;
+  transition: gap 0.5s;
+  background-color: ${({ selected }) =>
+    selected ? "#e0e0e0 !important" : "transparent"};
+
+  /* Prevent hover effects when menu is open */
+  &:hover {
+    background-color: ${({ selected }) =>
+      selected ? "#e0e0e0 !important" : "transparent"};
+  }
+`;
+
+const WorkbookListText = styled("div")`
+  color: #000;
+  font-size: 12px;
+  width: 100%;
+  max-width: 240px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+`;
+
+const StyledMenu = styled(Menu)`
+  .MuiPaper-root {
+    border-radius: 8px;
+    padding: 4px 0px;
+    box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.01);
+  },
+  .MuiList-root {
+    padding: 0;
+  },
+`;
+
+const MenuDivider = styled("div")`
+  width: 100%;
+  margin: auto;
+  margin-top: 4px;
+  margin-bottom: 4px;
+  border-top: 1px solid #eeeeee;
+`;
+
+const MenuItemWrapper = styled(MenuItem)`
+  display: flex;
+  justify-content: flex-start;
+  font-size: 12px;
+  width: calc(100% - 8px);
+  min-width: 140px;
+  margin: 0px 4px;
+  border-radius: 4px;
+  padding: 8px;
+  height: 32px;
+  gap: 8px;
+  svg {
+    width: 16px;
+    height: 16px;
+  }
+`;
+
+const SectionContainer = styled("div")`
+  margin-bottom: 16px;
+`;
+
+const SectionTitle = styled("div")`
+  font-weight: 600;
+  color: #9e9e9e;
+  margin-bottom: 8px;
+  padding: 0px 8px;
+  font-size: 12px;
+`;
+
+export default WorkbookList;

webapp/app.ironcalc.com/frontend/src/components/WorkbookTitle.tsx

@@ -72,10 +72,10 @@ export function WorkbookTitle(properties: {
 }
 
 const Container = styled("div")`
-  text-align: center;
-  padding: 8px;
+  text-align: left;
+  padding: 6px 4px;
   font-size: 14px;
-  font-weight: 700;
+  font-weight: 600;
   font-family: Inter;
 `;
 
@@ -108,7 +108,7 @@ const TitleInput = styled("input")`
     background-color: #f2f2f2;
   }
   &:focus {
-    border: 1px solid grey;
+    outline: 1px solid grey;
   }
   font-weight: inherit;
   font-family: inherit;

webapp/app.ironcalc.com/frontend/src/components/storage.ts

@@ -3,7 +3,7 @@ import { base64ToBytes, bytesToBase64 } from "./util";
 
 const MAX_WORKBOOKS = 50;
 
-type ModelsMetadata = Record<string, string>;
+type ModelsMetadata = Record<string, { name: string; createdAt: number }>;
 
 export function updateNameSelectedWorkbook(model: Model, newName: string) {
   const uuid = localStorage.getItem("selected");
@@ -12,7 +12,11 @@ export function updateNameSelectedWorkbook(model: Model, newName: string) {
     if (modelsJson) {
       try {
         const models = JSON.parse(modelsJson);
-        models[uuid] = newName;
+        if (models[uuid]) {
+          models[uuid].name = newName;
+        } else {
+          models[uuid] = { name: newName, createdAt: Date.now() };
+        }
         localStorage.setItem("models", JSON.stringify(models));
       } catch (e) {
         console.warn("Failed saving new name");
@@ -28,7 +32,26 @@ export function getModelsMetadata(): ModelsMetadata {
   if (!modelsJson) {
     modelsJson = "{}";
   }
-  return JSON.parse(modelsJson);
+  const models = JSON.parse(modelsJson);
+
+  // Migrate old format to new format
+  const migratedModels: ModelsMetadata = {};
+  for (const [uuid, value] of Object.entries(models)) {
+    if (typeof value === "string") {
+      // Old format: just the name string
+      migratedModels[uuid] = { name: value, createdAt: Date.now() };
+    } else if (typeof value === "object" && value !== null && "name" in value) {
+      // New format: object with name and createdAt
+      migratedModels[uuid] = value as { name: string; createdAt: number };
+    }
+  }
+
+  // Save migrated data back to localStorage
+  if (JSON.stringify(models) !== JSON.stringify(migratedModels)) {
+    localStorage.setItem("models", JSON.stringify(migratedModels));
+  }
+
+  return migratedModels;
 }
 
 // Pick a different name Workbook{N} where N = 1, 2, 3
@@ -48,14 +71,14 @@ function getNewName(existingNames: string[]): string {
 
 export function createNewModel(): Model {
   const models = getModelsMetadata();
-  const name = getNewName(Object.values(models));
+  const name = getNewName(Object.values(models).map((m) => m.name));
 
   const model = new Model(name, "en", "UTC");
   const uuid = crypto.randomUUID();
   localStorage.setItem("selected", uuid);
   localStorage.setItem(uuid, bytesToBase64(model.toBytes()));
 
-  models[uuid] = name;
+  models[uuid] = { name, createdAt: Date.now() };
   localStorage.setItem("models", JSON.stringify(models));
   return model;
 }
@@ -95,7 +118,7 @@ export function saveModelToStorage(model: Model) {
     modelsJson = "{}";
   }
   const models = JSON.parse(modelsJson);
-  models[uuid] = model.getName();
+  models[uuid] = { name: model.getName(), createdAt: Date.now() };
   localStorage.setItem("models", JSON.stringify(models));
 }
 
@@ -127,3 +150,37 @@ export function deleteSelectedModel(): Model | null {
   }
   return selectModelFromStorage(uuids[0]);
 }
+
+export function deleteModelByUuid(uuid: string): Model | null {
+  localStorage.removeItem(uuid);
+  const metadata = getModelsMetadata();
+  delete metadata[uuid];
+  localStorage.setItem("models", JSON.stringify(metadata));
+
+  // If this was the selected model, we need to select a different one
+  const selectedUuid = localStorage.getItem("selected");
+  if (selectedUuid === uuid) {
+    const uuids = Object.keys(metadata);
+    if (uuids.length === 0) {
+      return createNewModel();
+    }
+    // Find the newest workbook by creation timestamp
+    const newestUuid = uuids.reduce((newest, current) => {
+      const newestTime = metadata[newest]?.createdAt || 0;
+      const currentTime = metadata[current]?.createdAt || 0;
+      return currentTime > newestTime ? current : newest;
+    });
+    return selectModelFromStorage(newestUuid);
+  }
+
+  // If it wasn't the selected model, return the currently selected model
+  if (selectedUuid) {
+    const modelBytesString = localStorage.getItem(selectedUuid);
+    if (modelBytesString) {
+      return Model.from_bytes(base64ToBytes(modelBytesString));
+    }
+  }
+
+  // Fallback to creating a new model if no valid selected model
+  return createNewModel();
+}

xlsx/src/bin/xlsx_2_icalc.rs

@@ -7,7 +7,7 @@
 //! This is primary for QA internal testing and will be superseded by an official
 //! IronCalc CLI.
 //!
-//! Usage: test file.xlsx
+//! Usage: test file.xlsx [output.icalc]
 
 use std::path;
 
@@ -15,15 +15,20 @@ use ironcalc::{export::save_to_icalc, import::load_from_xlsx};
 
 fn main() {
     let args: Vec<_> = std::env::args().collect();
-    if args.len() != 2 {
-        panic!("Usage: {} <file.xlsx>", args[0]);
+    if args.len() != 2 && args.len() != 3 {
+        panic!("Usage: {} <file.xlsx> [output.icalc]", args[0]);
     }
     // first test the file
     let file_name = &args[1];
 
+    let output_file_name = if args.len() == 3 {
+        &args[2]
+    } else {
         let file_path = path::Path::new(file_name);
         let base_name = file_path.file_stem().unwrap().to_str().unwrap();
-    let output_file_name = &format!("{base_name}.ic");
+        &format!("{base_name}.ic")
+    };
+
     let model = load_from_xlsx(file_name, "en", "UTC").unwrap();
     save_to_icalc(&model, output_file_name).unwrap();
 }

xlsx/src/import/worksheets.rs

@@ -264,30 +264,29 @@ enum ParseReferenceError {
 // There is a similar named function in ironcalc_base. We probably should fix both at the same time.
 // NB: Maybe use regexes for this?
 fn parse_reference(s: &str) -> Result<CellReferenceRC, ParseReferenceError> {
-    let bytes = s.as_bytes();
     let mut sheet_name = "".to_string();
     let mut column = "".to_string();
     let mut row = "".to_string();
     let mut state = "sheet"; // "sheet", "col", "row"
-    for &byte in bytes {
+    for ch in s.chars() {
         match state {
             "sheet" => {
-                if byte == b'!' {
+                if ch == '!' {
                     state = "col"
                 } else {
-                    sheet_name.push(byte as char);
+                    sheet_name.push(ch);
                 }
             }
             "col" => {
-                if byte.is_ascii_alphabetic() {
-                    column.push(byte as char);
+                if ch.is_ascii_alphabetic() {
+                    column.push(ch);
                 } else {
                     state = "row";
-                    row.push(byte as char);
+                    row.push(ch);
                 }
             }
             _ => {
-                row.push(byte as char);
+                row.push(ch);
             }
         }
     }
@@ -1122,3 +1121,16 @@ pub(super) fn load_sheets<R: Read + std::io::Seek>(
     }
     Ok((sheets, selected_sheet))
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::import::worksheets::parse_reference;
+
+    #[test]
+    fn parse_reference_works() {
+        let cell_reference = parse_reference("📈 Overview!B2");
+        assert!(cell_reference.is_ok());
+        let cell_reference = cell_reference.unwrap();
+        assert_eq!(cell_reference.sheet, "📈 Overview");
+    }
+}

xlsx/tests/test.rs

@@ -472,6 +472,45 @@ fn test_exporting_merged_cells() {
     fs::remove_file(temp_file_name).unwrap();
 }
 
+#[test]
+fn test_templates_xlsx() {
+    let mut entries = fs::read_dir("tests/templates/")
+        .unwrap()
+        .map(|res| res.map(|e| e.path()))
+        .collect::<Result<Vec<_>, io::Error>>()
+        .unwrap();
+    entries.sort();
+    let temp_folder = env::temp_dir();
+    let path = format!("{}", Uuid::new_v4());
+    let dir = temp_folder.join(path);
+    fs::create_dir(&dir).unwrap();
+    let mut is_error = false;
+    for file_path in entries {
+        let file_name_str = file_path.file_name().unwrap().to_str().unwrap();
+        let file_path_str = file_path.to_str().unwrap();
+        println!("Testing file: {file_path_str}");
+        if file_name_str.ends_with(".xlsx") && !file_name_str.starts_with('~') {
+            if let Err(message) = test_file(file_path_str) {
+                println!("Error with file: '{file_path_str}'");
+                println!("{message}");
+                is_error = true;
+            }
+            let t = test_load_and_saving(file_path_str, &dir);
+            if t.is_err() {
+                println!("Error while load and saving file: {file_path_str}");
+                is_error = true;
+            }
+        } else {
+            println!("skipping");
+        }
+    }
+    fs::remove_dir_all(&dir).unwrap();
+    assert!(
+        !is_error,
+        "Models were evaluated inconsistently with XLSX data."
+    );
+}
+
 #[test]
 fn test_documentation_xlsx() {
     let mut entries = fs::read_dir("tests/docs/")