@@ -21,24 +21,80 @@ jobs:
2121 steps :
2222 - uses : actions/checkout@v4
2323
24+ - name : Check if changes were trivial
25+ id : check_trivial_changes
26+ run : |
27+ git fetch origin ${{ github.base_ref }} --unshallow
28+ base_ref=origin/${{ github.base_ref }}
29+ head_ref=HEAD
30+ changed_files=$(git diff-tree --name-status -r "$base_ref".."$head_ref" -- | cut -f2 -d$'\t')
31+ # Flag to check whether we do the rest of checks
32+ exception=true
33+
34+ for file in $changed_files; do
35+ # If changes were to a markdown file we don't mind
36+ if [[ $file == *.md ]]; then
37+ echo "$file: is markdown, so it doesn't matter (trivial change)"
38+ continue
39+ fi
40+
41+ # If changes were to a .cabal file, we ensure only the version changed
42+ if [[ $file == *.cabal ]]; then
43+ # If file doesn't exist it means it was moved or removed
44+ if [ ! -f "$file" ]; then
45+ echo "$file: was moved or removed and is a cabal file (non-trivial change)"
46+ exception=false
47+ break
48+ fi
49+
50+ # We ensure the only change was to the version field
51+ diff_version=$(git diff "$base_ref".."$head_ref" -- "$file" | perl -ne 'print if /^-(?!version:)/' | wc -l)
52+ diff_no_version=$(git diff "$base_ref".."$head_ref" -- "$file" | perl -ne 'print if /^\+(?!version:)/' | wc -l)
53+
54+ if [ "$diff_version" -gt 1 ] || [ "$diff_no_version" -gt 1 ]; then
55+ echo "$file: was modified beyond the version tag (non-trivial change)"
56+ exception=false
57+ break
58+ fi
59+ echo "In $file, at most the version field was modified"
60+ else
61+ # If other types of files were changed, do not skip the checks
62+ echo "$file: was changed and is not a markdown nor a cabal file (non-trivial change)"
63+ exception=false
64+ break
65+ fi
66+ done
67+
68+ if $exception; then
69+ echo "CHECK_HLS_WORKS=0" >> "$GITHUB_OUTPUT"
70+ echo "All changes are trival, skipping rest of checks..."
71+ else
72+ echo "CHECK_HLS_WORKS=1" >> "$GITHUB_OUTPUT"
73+ echo "Some changes are non-trivial. We need to do the checks!"
74+ fi
2475uses : cachix/install-nix-action@v30
76+ if : steps.check_trivial_changes.outputs.CHECK_HLS_WORKS > 0
2577 with :
2678 nix_path : nixpkgs=channel:nixos-unstable
2779 extra_nix_config : |
2880 trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
2981 substituters = https://cache.iog.io/ https://cache.nixos.org/
3082
3183uses : rrbutani/use-nix-shell-action@v1
84+ if : steps.check_trivial_changes.outputs.CHECK_HLS_WORKS > 0
3285
3386 - name : Update dependencies
87+ if : steps.check_trivial_changes.outputs.CHECK_HLS_WORKS > 0
3488 run : cabal update; cabal freeze
3589
3690 - name : Obtain GHC version
91+ if : steps.check_trivial_changes.outputs.CHECK_HLS_WORKS > 0
3792 run : |
3893 echo "VERSION=$(ghc --numeric-version)" >> "$GITHUB_OUTPUT"
3994id : ghc
4095
4196 - name : HLS caching
97+ if : steps.check_trivial_changes.outputs.CHECK_HLS_WORKS > 0
4298 uses : actions/cache@v4
4399 with :
44100 path : |
52108 hls-cache-${{ env.HLS_CACHE_VERSION }}-${{ runner.os }}-${{ steps.ghc.outputs.VERSION }}-${{ hashFiles('**/cabal.project.freeze') }}-
53109
54110name : Test HLS works
111+ if : steps.check_trivial_changes.outputs.CHECK_HLS_WORKS > 0
55112 run : haskell-language-server
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