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−#!/usr/bin/env bash
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−# This is a pre-commit hook for use with either mercurial or git.
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−#
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−# Install this by running the script with an argument of "install".
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−#
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−# All that does is add the following lines to .hg/hgrc:
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−#
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−# [hook]
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−# pretxncommit.clang-format = [ ! -x ./coreconf/precommit.clang-format.sh ] || ./coreconf/precommit.clang-format.sh
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−#
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−# Or installs a symlink to .git/hooks/precommit:
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−# $ ln -s ../../coreconf/precommit.clang-format.sh .git/hooks/pre-commit
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−
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−hash clang-format || exit 1
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−[ "$(hg root 2>/dev/null)" = "$PWD" ] && hg=1 || hg=0
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−[ "$(git rev-parse --show-toplevel 2>/dev/null)" = "$PWD" ] && git=1 || git=0
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−
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−if [ "$1" = "install" ]; then
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−    if [ "$hg" -eq 1 ]; then
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−        hgrc="$(hg root)"/.hg/hgrc
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−        if ! grep -q '^pretxncommit.clang-format' "$hgrc"; then
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−            echo '[hooks]' >> "$hgrc"
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−            echo 'pretxncommit.clang-format = [ ! -x ./coreconf/precommit.clang-format.sh ] || ./coreconf/precommit.clang-format.sh' >> "$hgrc"
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−            echo "Installed mercurial pretxncommit hook"
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−            exit
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−        fi
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−    fi
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−    if [ "$git" -eq 1 ]; then
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−        hook="$(git rev-parse --show-toplevel)"/.git/hooks/pre-commit
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−        if [ ! -e "$hook" ]; then
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−            ln -s ../../coreconf/precommit.clang-format.sh "$hook"
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−            echo "Installed git pre-commit hook"
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−            exit
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−        fi
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−    fi
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−    echo "Hook already installed, or not in NSS repo"
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−    exit 2
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−fi
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−
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−err=0
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−files=()
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−if [ "$hg" -eq 1 ]; then
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−    files=($(hg status -m -a --rev tip^:tip | cut -f 2 -d ' ' -))
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−fi
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−if [ "$git" -eq 1 ]; then
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−    files=($(git status --porcelain | sed '/^[MACU]/{s/..//;p;};/^R/{s/^.* -> //;p;};d'))
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−fi
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−tmp=$(mktemp)
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−trap 'rm -f "$tmp"' ERR EXIT
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−for f in "${files[@]}"; do
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−    ext="${f##*.}"
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−    if [ "$ext" = "c" -o "$ext" = "h" -o "$ext" = "cc" ]; then
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−        [ "$hg" -eq 1 ] && hg cat -r tip "$f" > "$tmp"
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−        [ "$git" -eq 1 ] && git show :"$f" > "$tmp"
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−        if ! cat "$tmp" | clang-format -assume-filename="$f" | \
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−            diff -q "$tmp" - >/dev/null; then
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−            [ "$err" -eq 0 ] && echo "Formatting errors found in:" 1>&2
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−            echo "  $f" 1>&2
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−            err=1
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−        fi
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−    fi
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−done
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−exit "$err"