tldr/scripts/check-pr.sh

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#!/usr/bin/env bash
# SPDX-License-Identifier: MIT
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# This script is executed by GitHub Actions for every pull request opened.
# It currently accomplishes the following objectives (for English pages only):
#
# 1. Detect pages that were just copied (i.e. cp pages/{common,linux}/7z.md).
# 2. Detect pages that were added in a platform specific directory although
# they already exist under 'common'.
# 3. Detect pages that were added in the 'common' platform although they
# already exist under a platform specific directory.
# 4. Detect other miscellaneous anomalies in the pages folder.
#
# Results are printed to stdout, logs and errors to stderr.
#
# NOTE: must be run from the repository root directory to correctly work!
# NOTE: no `set -e`, failure of this script should not invalidate the build.
# Check for duplicated pages.
function check_duplicates {
local page=$1 # page path in the format 'platform/pagename.md'
local parts
local other
readarray -td'/' parts < <(echo -n "$page")
local platform=${parts[0]}
local file=${parts[1]}
case "$platform" in
common) # check if page already exists in other platforms
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for other in ${PLATFORMS/common/}; do
if [[ -f "pages/$other/$file" ]]; then
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printf "\x2d $MSG_EXISTS" "$page" "$other"
fi
done
;;
*) # check if page already exists under common
if [[ -f "pages/common/$file" ]]; then
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printf "\x2d $MSG_EXISTS" "$page" 'common'
fi
;;
esac
}
# Look at git diff and check for copied/duplicated pages.
function check_diff {
local git_diff
local line
local entry
git_diff=$(git diff --name-status --find-copies-harder --diff-filter=AC --relative=pages/ remotes/origin/main)
if [[ -n $git_diff ]]; then
echo -e "Check PR: git diff:\n$git_diff" >&2
else
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echo 'Check PR: git diff looks fine, no interesting changes detected.' >&2
return 0
fi
while read line; do
readarray -td$'\t' entry < <(echo -n "$line")
local change="${entry[0]}"
local file1="${entry[1]}"
local file2="${entry[2]}"
case "$change" in
C*) # file2 is a copy of file1
local percentage=${change#C}
percentage=${percentage#0}
percentage=${percentage#0}
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printf "\x2d $MSG_IS_COPY" "$file2" "$file1" "$percentage"
;;
A) # file1 was newly added
check_duplicates "$file1"
;;
esac
done <<< "$git_diff"
}
# Recursively check the pages/ folder for anomalies.
function check_structure {
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for platform in $PLATFORMS; do
if [[ ! -d "pages/$platform" ]]; then
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printf "\x2d $MSG_NOT_DIR" "pages/$platform"
else
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for page in "pages/$platform"/*; do
if [[ ! -f $page ]]; then
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printf "\x2d $MSG_NOT_FILE" "$page"
elif [[ ${page:(-3)} != ".md" ]]; then
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printf "\x2d $MSG_NOT_MD" "$page"
fi
done
fi
done
}
###################################
# MAIN
###################################
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MSG_EXISTS='The page `%s` already exists under the `%s` platform.\n'
MSG_IS_COPY='The page `%s` seems to be a copy of `%s` (%d%% matching).\n'
MSG_NOT_DIR='The file `%s` does not look like a directory.\n'
MSG_NOT_FILE='The file `%s` does not look like a regular file.\n'
MSG_NOT_MD='The file `%s` does not have a `.md` extension.\n'
PLATFORMS=$(ls pages/)
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if [[ $CI == true && $GITHUB_REPOSITORY == "tldr-pages/tldr" && $PULL_REQUEST_ID != "" ]]; then
check_diff
check_structure
else
echo 'Not a pull request, refusing to run.' >&2
exit 0
fi