git-case-field

#!/bin/bash
#
# Assumptions:
#  - in a git repository
#  - we can access git-case-common
#  - the branch defined by GIT_CASE_HEAD exists (see git-case-common)

source $(dirname $0)/git-case-common

test -z "$1" && die "$PROGRAM [-d] <field-name> [<value>]"

if test "$1" = "-d" ; then
        test "${#@}" = 2 || die "when deleting syntax is: $PROGRAM -d <field-name>"

        action="removed"
        FIELD="$2"

elif test "${#@}" = 1 ; then
        action="read"
        FIELD="$1"

elif test "${#@}" = 2 ; then
        action="set"
        FIELD="$1" ; shift
        VALUE="$@"

else
        die "too many arguments"
fi

echo "$FIELD" | grep -q '^[a-zA-Z0-9][a-zA-Z0-9._-]*$' || die "format of field '$FIELD' is invalid"

ID=$(cat "$GIT_CASE_ACTIVE" 2>/dev/null || true)
test -z "$ID" && die "no active case set"
shortID=$(gen_short_case_id "$ID")

FIELD_FILE="$ID/fields/$FIELD"

count=$(git ls-tree $GIT_CASE_HEAD "$FIELD_FILE" | wc -l)
if test "$action" = "removed" -a "$count" -ne "1" ; then
        die "no field '$FIELD' set on case $shortID"
fi

# handle read first
if test "$action" = "read" ; then
        test "$count" -ne "1" && die "no field '$FIELD' set on case $shortID"

        exec git show "$GIT_CASE_HEAD:$FIELD_FILE"
fi

# we work in the working dir
go_to_git_case_work_dir

git read-tree -i --reset "$GIT_CASE_HEAD"

if test "$action" = "set" ; then
        add_file_to_index "$FIELD_FILE" "$VALUE"
else
        git update-index --remove "$FIELD_FILE"
fi

commit_index_and_update_branch "field '$FIELD' $action on $ID" "-p $GIT_CASE_HEAD"