precommit.clang-format.sh

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#!/usr/bin/env bash

# This is a pre-commit hook for use with either mercurial or git.

# Install this by running the script with an argument of "install".

# All that does is add the following lines to .hg/hgrc:

# [hook]

# pretxncommit.clang-format = [ ! -x ./coreconf/precommit.clang-format.sh ] || ./coreconf/precommit.clang-format.sh

# Or installs a symlink to .git/hooks/precommit:

# $ ln -s ../../coreconf/precommit.clang-format.sh .git/hooks/pre-commit

hash clang-format || exit 1

[ "$(hg root 2>/dev/null)" = "$PWD" ] && hg=1 || hg=0

[ "$(git rev-parse --show-toplevel 2>/dev/null)" = "$PWD" ] && git=1 || git=0

if [ "$1" = "install" ]; then

    if [ "$hg" -eq 1 ]; then

        hgrc="$(hg root)"/.hg/hgrc

        if ! grep -q '^pretxncommit.clang-format' "$hgrc"; then

            echo '[hooks]' >> "$hgrc"

            echo 'pretxncommit.clang-format = [ ! -x ./coreconf/precommit.clang-format.sh ] || ./coreconf/precommit.clang-format.sh' >> "$hgrc"

            echo "Installed mercurial pretxncommit hook"

            exit

fi

fi

    if [ "$git" -eq 1 ]; then

        hook="$(git rev-parse --show-toplevel)"/.git/hooks/pre-commit

        if [ ! -e "$hook" ]; then

            ln -s ../../coreconf/precommit.clang-format.sh "$hook"

            echo "Installed git pre-commit hook"

            exit

fi

fi

    echo "Hook already installed, or not in NSS repo"

    exit 2

fi

err=0

files=()

if [ "$hg" -eq 1 ]; then

    files=($(hg status -m -a --rev tip^:tip | cut -f 2 -d ' ' -))

fi

if [ "$git" -eq 1 ]; then

    files=($(git status --porcelain | sed '/^[MACU]/{s/..//;p;};/^R/{s/^.* -> //;p;};d'))

fi

tmp=$(mktemp)

trap 'rm -f "$tmp"' ERR EXIT

for f in "${files[@]}"; do

    ext="${f##*.}"

    if [ "$ext" = "c" -o "$ext" = "h" -o "$ext" = "cc" ]; then

        [ "$hg" -eq 1 ] && hg cat -r tip "$f" > "$tmp"

        [ "$git" -eq 1 ] && git show :"$f" > "$tmp"

        if ! cat "$tmp" | clang-format -assume-filename="$f" | \

            diff -q "$tmp" - >/dev/null; then

            [ "$err" -eq 0 ] && echo "Formatting errors found in:" 1>&2

            echo "  $f" 1>&2

            err=1

fi

fi

done

exit "$err"