refactor: CI and nix (hmemcpy#306)

* fix: remove custom fonts

Since they are available in Nix, there is no need to keep them in the project anymore

* chore: remove old obsolete files

* refactor: rewrite Nix files

- Switch from `numtide/flake-utils` to `flake-parts`
- Add custom font derivation for LaTeX
- Add `formatter`
- Switch to `python311`

* ci: update Github workflows

* feat: add `Makefile` for local development

Very useful when used in combination with `nix develop`

* feat: add `.envrc` file for loading development environment with `nix-direnv`

* feat: add `.editorconfig` and `.prettierrc`

* style: reformat files using `prettier`

Run `nix run nixpkgs#nodePackages.prettier -- --write .`

* fix: add workaround to prevent bug with `minted` package

see gpoore/minted#353 for context

* fix: add `version.tex` in the repo

* chore: rewrite `README`

* chore: ignore LaTeX temporary files while building locally

* feat: add `latexindent.pl` configuration file

* style: lint LaTeX files

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+indent_size = 4
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[Makefile]
+indent_style = tab
+
+[*.{tex,cls,lua,nix}]
+indent_style = space
+indent_size = 2
+max_line_length = 80
+
+[*.md]
+trim_trailing_whitespace = false
+indent_size = 2
+max_line_length = 80

.envrc

@@ -0,0 +1,2 @@
+use flake .
+use flake github:loophp/nix-prettier

.github/settings.yml

@@ -0,0 +1,51 @@
+# https://github.com/probot/settings
+
+branches:
+    - name: master
+      protection:
+          enforce_admins: false
+          required_pull_request_reviews:
+              dismiss_stale_reviews: true
+              require_code_owner_reviews: true
+              required_approving_review_count: 1
+          restrictions: null
+          required_linear_history: true
+          required_status_checks:
+              strict: true
+
+labels:
+    - name: typo
+      color: ee0701
+
+    - name: dependencies
+      color: 0366d6
+
+    - name: enhancement
+      color: 0e8a16
+
+    - name: question
+      color: cc317c
+
+    - name: security
+      color: ee0701
+
+    - name: stale
+      color: eeeeee
+
+repository:
+    allow_merge_commit: true
+    allow_rebase_merge: true
+    allow_squash_merge: true
+    default_branch: master
+    description:
+        "Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and
+        LaTeX sources"
+    homepage: https://bartoszmilewski.com/2014/10/28/category-theory-for-programmers-the-preface/
+    topics: pdf,haskell,scala,latex,cpp,functional-programming,ocaml,category-theory
+    has_downloads: true
+    has_issues: true
+    has_pages: false
+    has_projects: false
+    has_wiki: false
+    name: milewski-ctfp-pdf
+    private: false

.github/workflows/nix-flake-check.yaml

@@ -0,0 +1,64 @@
+name: Check and build
+
+on:
+    pull_request:
+    push:
+        branches:
+            - master
+jobs:
+    dependencies:
+        name: Build dependencies
+        runs-on: ubuntu-latest
+        outputs:
+            version: ${{ steps.version.outputs.version }}
+
+        steps:
+            - name: Set up Git repository
+              uses: actions/checkout@v3
+
+            - name: Create global variables
+              id: version
+              run:
+                  echo "version=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+    determine-matrix:
+        name: Figure out the packages we need to build
+        runs-on: ubuntu-latest
+        needs: [dependencies]
+
+        outputs:
+            matrix: ${{ steps.set-matrix.outputs.matrix }}
+
+        steps:
+            - name: Set up Git repository
+              uses: actions/checkout@v3
+
+            - name: Install the Nix package manager
+              uses: cachix/install-nix-action@v18
+
+            - id: set-matrix
+              run: |
+                  echo "matrix=$(
+                    nix eval --json .#packages.x86_64-linux --apply builtins.attrNames
+                  )" >> $GITHUB_OUTPUT
+
+    build:
+        name: Build
+        needs: determine-matrix
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                packages: ${{fromJson(needs.determine-matrix.outputs.matrix)}}
+
+        steps:
+            - name: Set up Git repository
+              uses: actions/checkout@v3
+
+            - name: Install Nix
+              uses: cachix/install-nix-action@v18
+
+            - name: Nix flake check
+              run: nix flake check
+
+            - name: Build ${{ matrix.packages }}.pdf
+              run: nix build .#${{ matrix.packages }}

.github/workflows/nix-fmt-checks.yaml

@@ -0,0 +1,17 @@
+name: Nix formatter checks
+
+on:
+    pull_request:
+
+jobs:
+    format-check:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@v3
+
+            - name: Install Nix
+              uses: cachix/install-nix-action@v18
+
+            - name: Run nix formatter tool
+              run: nix fmt . -- --check

.github/workflows/prettier-checks.yaml

@@ -0,0 +1,18 @@
+name: Prettier checks
+
+on:
+    pull_request:
+
+jobs:
+    prettier:
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v3
+
+            - name: Install the Nix package manager
+              uses: cachix/install-nix-action@v18
+
+            - name: Checks
+              run: nix run nixpkgs#nodePackages.prettier -- --check .

.github/workflows/release.yaml

@@ -0,0 +1,99 @@
+name: Release PDFs
+
+on:
+    push:
+        tags:
+            - "**"
+
+jobs:
+    determine-matrix:
+        name: Figure out the assets we need to build
+        runs-on: ubuntu-latest
+
+        outputs:
+            matrix: ${{ steps.set-matrix.outputs.matrix }}
+
+        steps:
+            - name: Set up Git repository
+              uses: actions/checkout@v3
+
+            - name: Install the Nix package manager
+              uses: cachix/install-nix-action@v18
+
+            - id: set-matrix
+              run: |
+                  echo "matrix=$(
+                      nix eval --json --impure \
+                      --expr 'builtins.filter (x: (null == builtins.match "(.*)-nts" x)) (builtins.attrNames (import ./.).packages.x86_64-linux)'
+                  )" >> $GITHUB_OUTPUT
+
+    build:
+        name: Build documents
+        needs: determine-matrix
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                packages: ${{fromJson(needs.determine-matrix.outputs.matrix)}}
+
+        steps:
+            - name: Set up Git repository
+              uses: actions/checkout@v3
+
+            - name: Install Nix
+              uses: cachix/install-nix-action@v18
+
+            - name: Build ${{ matrix.packages }}.pdf
+              run: |
+                  nix build .#${{ matrix.packages }}
+                  mkdir -p out
+                  cp -ar ./result/* out/
+
+            - name: Upload build assets (${{ matrix.packages }}.pdf)
+              uses: actions/upload-artifact@v2
+              with:
+                  name: ctfp
+                  path: out/*
+
+    release:
+        name: "Create Github pre-release"
+        runs-on: ubuntu-latest
+        needs: [build]
+        outputs:
+            upload_url: ${{ steps.create_release.outputs.upload_url }}
+        steps:
+            - name: Create Github pre-release (${{ github.ref }})
+              id: create_release
+              uses: actions/create-release@v1
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              with:
+                  tag_name: ${{ github.ref }}
+                  release_name: ${{ github.ref }}
+                  draft: true
+
+    assets:
+        name: Upload release assets
+        runs-on: ubuntu-latest
+        needs: [determine-matrix, release]
+        strategy:
+            matrix:
+                packages: ${{fromJson(needs.determine-matrix.outputs.matrix)}}
+
+        steps:
+            - name: Download build assets (${{ matrix.packages }}.pdf)
+              uses: actions/download-artifact@v2
+              with:
+                  name: ctfp
+                  path: ctfp
+
+            - name:
+                  Upload release assets (${{ matrix.packages }}--${{ github.ref
+                  }}.pdf)
+              uses: actions/upload-release-asset@v1
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              with:
+                  upload_url: ${{ needs.release.outputs.upload_url }}
+                  asset_path: ctfp/${{ matrix.packages }}.pdf
+                  asset_name: ${{ matrix.packages }}--${{ github.ref }}.pdf
+                  asset_content_type: application/pdf