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#!/usr/bin/env bash
#
# Copy or link this file as ".git/hooks/pre-commit".
# Prepare a copy of the message:
# - strip comment lines
# - stop at "diff --git" (git commit -v)
commit_msg="$GIT_DIR/COMMIT_MSG"
sed -n -e '/^#/d' -e '/^diff --git/q' -e 'p;d' "$1" > "$commit_msg"
die() {
echo 'commit-msg hook failure' 1>&2
echo '-----------------------' 1>&2
echo '' 1>&2
echo "$@" 1>&2
echo 'To continue editing, run the command
git commit -e -F '"$commit_msg"'
(assuming your working directory is at the top).' 1>&2
exit 1
}
#-----------------------------------------------------------------------------
# Check the commit message layout with a simple state machine.
msg_first() {
len=$(echo -n "$line" | wc -c)
if test $len -eq 0; then
# not yet first line
return
elif test $len -lt 8; then
die 'The first line must be at least 8 characters:
--------
'"$line"'
--------
'
elif test $len -gt 78; then
die 'The first line may be at most 78 characters:
------------------------------------------------------------------------------
'"$line"'
------------------------------------------------------------------------------
'
elif echo "$line" | grep "^[ ]\|[ ]$" >/dev/null 2>&1; then
die 'The first line may not have leading or trailing space:
['"$line"']
'
else
# first line okay
state=second
fi
}
msg_second() {
if test "x$line" != "x"; then
die 'The second line must be empty:
'"$line"
else
state=rest
fi
}
msg_rest() {
false
}
# Pipe commit message into the state machine.
state=first
cat "$commit_msg" |
while IFS='' read line; do
msg_$state || break
done &&
rm -f "$commit_msg"
|
