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173
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1 #!/bin/bash
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2
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3 set -euo pipefail
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4
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5 # "script-and-regex.regex": "/^(?P<severity>.*?)\n(?P<message>.*?)\n(?P<line>\\d),(?P<char>\\d)(\n(?P<original>.*?)>>>>\n(?P<replacement>.*?)<<<<?)$/s",
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6
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7 # Arcanist linter that invokes clang-format via clang/tools/clang-format/clang-format-diff.py
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8 # stdout from this script is parsed into a regex and used by Arcanist.
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9 # https://secure.phabricator.com/book/phabricator/article/arcanist_lint_script_and_regex/
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10
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11 # To skip running all linters when creating/updating a diff, use `arc diff --nolint`.
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12
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13 # advice severity level is completely non-disruptive.
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14 # switch to warning or error if you want to prompt the user.
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15 if ! hash clang-format >/dev/null; then
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16 echo "advice"
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17 echo "clang-format not found in user's PATH; not linting file."
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18 echo "===="
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19 exit 0
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20 fi
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21 if ! git rev-parse --git-dir >/dev/null; then
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22 echo "advice"
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23 echo "not in git repostitory; not linting file."
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24 echo "===="
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25 exit 0
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26 fi
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27
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28 src_file="${1}"
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29 original_file="$(mktemp)"
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30 formatted_file="$(mktemp)"
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31 readonly src_file
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32 readonly original_file
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33 readonly formatted_file
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34 cp -p "${src_file}" "${original_file}"
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35 cp -p "${src_file}" "${formatted_file}"
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36
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37 cleanup() {
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38 rc=$?
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39 rm "${formatted_file}" "${original_file}"
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40 exit ${rc}
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41 }
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42 trap 'cleanup' INT HUP QUIT TERM EXIT
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43
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44 # Arcanist can filter out lint messages for unchanged lines, but for that, we
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45 # need to generate line by line lint messages. Instead, we generate one lint
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46 # message on line 1, char 1 with file content edited using clang-format-diff.py
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47 #
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48 # We do not use git-clang-format because it wants to modify the index,
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49 # and arc is already holding the lock.
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50 #
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51 # We do not look for clang-format-diff or clang-format-diff.py in the PATH
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52 # because whether/how these are installed differs between distributions,
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53 # and we have an executable copy in the tree anyway.
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54 arc_base_commit=$(arc which --show-base)
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55 git diff-index -U0 "${arc_base_commit}" \
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56 | clang/tools/clang-format/clang-format-diff.py -style file -i -p1
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57
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58 cp -p "${src_file}" "${formatted_file}"
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59 cp -p "${original_file}" "${src_file}"
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60 if ! diff -q "${src_file}" "${formatted_file}" > /dev/null ; then
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61 echo "autofix"
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62 echo "clang-format suggested style edits found:"
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63 echo "1,1" # line,char of start of replacement.
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64 cat "${src_file}"
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65 echo ">>>>"
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66 cat "${formatted_file}"
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67 echo "<<<<"
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68 fi
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