prepare-commit-msg

#!/bin/bash -e

COMMIT_FILE=$1

. git-sh-setup

CACHE_FILE=$GIT_DIR/jira.cache

JIRA_SERVER=$(git config jira.server || true)
JIRA_USER=$(git config jira.user || true)
JIRA_PASSWORD=$(git config jira.password || true)

JIRA_COMMIT_TEMPLATE=$(git config jira.commit.template || true)

JIRA_CLI=$(git config jira.cli || true)

JIRA_CMD="$JIRA_CLI --server $JIRA_SERVER --user $JIRA_USER --password $JIRA_PASSWORD"

function prepend () {
	local MSG=$1
	# Give up if we already have a commit message (like when rebasing)
	awk 'NR==1 && /^$/ { exit 0 }; {exit 1} ' < $COMMIT_FILE || return 0
	echo -e $MSG | sed -i '' -e "1s/^/\
# [jira]/" -e 'r /dev/stdin' -e '2s/^/# \
/' $COMMIT_FILE
}

function prepend_ok () {
	local MSG=$1
	# Give up if we already have a commit message (like when rebasing)
	awk 'NR==1 && /^$/ { exit 0 }; {exit 1} ' < $COMMIT_FILE || return 0
	echo $MSG | sed -i '' -e 'r /dev/stdin'  -e '1d' -e '2s/^/\
/' $COMMIT_FILE
}

function get_cached_issue () {
	local ISSUE=$1
	test -f $CACHE_FILE || return 0
	local LINE=`grep ^$ISSUE: $CACHE_FILE`
	test -n "$LINE" || return 0
	ISSUE_DESCR=$(echo $LINE | sed -e "s/^$ISSUE: //")
}

function fail () {
	echo $@
	exit 1
}

# start to work

require_work_tree

test -n "$GIT_DIR" || fail "Missing GIT_DIR variable"
test -n "$COMMIT_FILE" || fail "Missing commit file argument"
test -n "$JIRA_SERVER" || fail "Missing git config variable jira.server (set it with 'git config jira.server ...')"
test -n "$JIRA_CLI" || fail "Missing git config variable jira.cli (set it with 'git config jira.cli ...')"
test -n "$JIRA_USER" || fail "Missing git config variable jira.user (set it with 'git config jira.user ...')"
test -n "$JIRA_PASSWORD" || fail "Missing git config variable jira.password (set it with 'git config jira.password ...')"
test -n "$JIRA_COMMIT_TEMPLATE" || JIRA_COMMIT_TEMPLATE="[%i]: %t"


BRANCH_NAME=`git symbolic-ref HEAD | sed -e 's/refs\/heads\///'`

if test -z "$BRANCH_NAME"
then
	prepend "# Not committing from a branch"
	exit 0
fi

# is the branch a JIRA key?
if [[ ! ( $BRANCH_NAME =~ ^[A-Z]+-[0-9]+$ ) ]]
then
	prepend "# Branch does not appear to be a JIRA issue"
	exit 0
fi

get_cached_issue $BRANCH_NAME

if test -z "$ISSUE_DESCR"
then
	echo "Querying JIRA, this might take a while..."
	ISSUE_DESCR=`$JIRA_CMD --action getFieldValue --issue $BRANCH_NAME --field Summary | sed -e '1d'`
	SHOULD_CACHE=1
fi

if test -z "$ISSUE_DESCR"
then
	prepend "# Branch appears to be a JIRA issue but we were unable to get its description"
	exit 0
fi

if test "$SHOULD_CACHE" = "1"
then
	echo "$BRANCH_NAME: $ISSUE_DESCR" >> $CACHE_FILE

fi

prepend "# [$BRANCH_NAME]: $ISSUE_DESCR\n# View issue at $JIRA_SERVER/browse/$BRANCH_NAME"

MSG=`echo $JIRA_COMMIT_TEMPLATE | awk -v i="$BRANCH_NAME" -v t="$ISSUE_DESCR" '{sub(/%i/,i); sub(/%t/,t); print}'`
prepend_ok "#$MSG"