Adding extra info about setting custom rules with fortitude

.gitignore

@@ -5,4 +5,5 @@ build/
 build-cmake/
 *Temporary
 .vscode
-*.egg-info
+*.egg-info
+.venv

.pre-commit-config.yaml

@@ -7,4 +7,4 @@ repos:
     # requires the `--config-file` option to be specified before the `check` subcommand
     # and the pre-commit hook correctly states check in the entry.
     - id: fortitude
-      entry: fortitude --config-file formatting/fortitude.toml check --force-exclude
+      entry: fortitude --config-file formatting/fortitude/fortitude.toml check --force-exclude

README.md

@@ -108,11 +108,11 @@ fpm test
 [pre-commit](https://pre-commit.com/) is utilised within this repo. pre-commit is a tool to help enforce formatting standards as early as possible.
 pre-commit works by running a provided set of checks every time a `git commit` is attempted.
 
-To utilise pre-commit, it must be installed locally. This can be done in several ways but the easiest is to use the provided `pyproject.toml` via...
+To utilise pre-commit, it must be installed locally. This can be done in several ways but the easiest is to use the provided `requirements.txt` via...
 ```
 python3 -m venv .venv
 source .venv/bin/activate
-python -m pip install -e .
+python -m pip install -r requirements.txt
 ``` 
 
 Then, from the root of the repo, you start using pre-commit by running

formatting/README.md

@@ -4,4 +4,4 @@
 
 | tool | description | Known issues |
 | ---- | ----------- | ------------ |
-| [Fortitude](https://fortitude.readthedocs.io/en/stable/) | A [Ruff](https://docs.astral.sh/ruff/) style linter for Fortran. | |
+| [Fortitude](./fortitude/) | A [Ruff](https://docs.astral.sh/ruff/) style linter for Fortran. | |

formatting/fortitude.md → formatting/fortitude/README.md

@@ -6,7 +6,8 @@ A tool for installing, i.e. `pip` or `homebrew`
 
 ## Installation
 
-To install fortitude we can utilise the provided `pyproject.toml` by following the instructions in [the pre-commit install instructions](../README.md#pre-commit). The [quickstart page](https://fortitude.readthedocs.io/en/stable/#quickstart) for Fortitude details multiple other ways of installing the tool.
+To install fortitude we can utilise the provided `requirements.txt` by following the instructions in [the pre-commit install instructions](../../README.md#pre-commit).
+The [quickstart page](https://fortitude.readthedocs.io/en/stable/#quickstart) for Fortitude details multiple other ways of installing the tool.
 
 ## Usage in this repo
 
@@ -16,11 +17,14 @@ This repo has been formatted with Fortitude. To check this repo with Fortitude,
 fortitude --config-file formatting/fortitude.toml check
 ```
 
-The config file, [fortitude.toml](./fortitude.toml), we have provided in the above command contains our rules which alter the [default fortitude rules](https://fortitude.readthedocs.io/en/stable/rules/).
+The config file, [fortitude.toml](./fortitude.toml), we have provided in the above command contains our rules which alter the 
+[default fortitude rules](https://fortitude.readthedocs.io/en/stable/rules/). 
+
+
 
 ### pre-commit
 
-We have also integrated Fortitude with pre-commit. To set this up, follow the [instructions on the main README.md](../README.md#pre-commit).
+We have also integrated Fortitude with pre-commit. To set this up, follow the [instructions on the main README.md](../../README.md#pre-commit).
 Once this is set up, if you then try and commit a poorly formatted Fortran file...
 
 ```sh

formatting/fortitude/fortitude.toml

@@ -0,0 +1,9 @@
+[check]
+# A set of rules we ignore. Fortitude will not enforce these rules.
+ignore = [
+    "C003", # 'implicit none' missing 'external'
+]
+
+# A custom maxmum line length for our repo which will effect the 
+# behaviour of rule S001	(line-too-long)
+line-length = 132

requirements.txt

@@ -0,0 +1,2 @@
+fortitude-lint>=0.7.2
+pre-commit>=4.2.0

testing/veggies/test_poisson_given_when_then.f90

@@ -44,7 +44,6 @@ module veggies_poisson_given_when_then
 contains
 
     function test_poisson_given_when_then() result(test)
-        implicit none
         type(test_item_t) :: test
 
         character(len=:), allocatable :: file_name
@@ -73,7 +72,6 @@ function test_poisson_given_when_then() result(test)
     end function test_poisson_given_when_then
 
     function load_data_file(input) result(output)
-        implicit none
         class(input_t), intent(in) :: input
         type(transformed_t) :: output
 
@@ -109,7 +107,6 @@ function load_data_file(input) result(output)
     end function load_data_file
 
     function check_file_is_open(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -122,7 +119,6 @@ function check_file_is_open(input) result(result_)
     end function check_file_is_open
 
     function check_num_nodes(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -136,7 +132,6 @@ function check_num_nodes(input) result(result_)
     end function check_num_nodes
 
     function check_num_elements(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -150,7 +145,6 @@ function check_num_elements(input) result(result_)
     end function check_num_elements
 
     function check_num_boundary_points(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -164,7 +158,6 @@ function check_num_boundary_points(input) result(result_)
     end function check_num_boundary_points
 
     function check_element_to_node(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -180,7 +173,6 @@ function check_element_to_node(input) result(result_)
     end function check_element_to_node
 
     function check_vb_index(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -193,7 +185,6 @@ function check_vb_index(input) result(result_)
     end function check_vb_index
 
     function check_boundary_node_num(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -208,7 +199,6 @@ function check_boundary_node_num(input) result(result_)
     end function check_boundary_node_num
 
     function check_num_side_nodes(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -225,7 +215,6 @@ function check_num_side_nodes(input) result(result_)
     end function check_num_side_nodes
 
     function check_vb(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -241,7 +230,6 @@ function check_vb(input) result(result_)
     end function check_vb
 
     function check_vb1(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -254,7 +242,6 @@ function check_vb1(input) result(result_)
     end function check_vb1
 
     function check_coordinates(input) result(result_)
-        implicit none
         class(input_t), intent(in) :: input
         type(result_t) :: result_
 
@@ -274,7 +261,6 @@ end function check_coordinates
 !! Constructors
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     function data_file_state_constructor() result(data_file_state)
-        implicit none
         type(data_file_state_t) :: data_file_state
 
         integer, parameter :: file_io = 200