#!/bin/bash

check_po() {
    rev=$1
    path=$2
    mode=$3

    case "$path" in
	*.po)
	    ;;
	*)
	    return
	    ;;
    esac

    basename=`basename $path`

    # Perform extensive tests. This could be disabled if GNOME .po
    # files used newer features than those available on git.gnome.org.
    dash_c="-c"

    # Parse the file and check for errors
    result=`git cat-file blob "$rev:$path" | msgfmt $dash_c -o /dev/null - 2>&1`
    if [ $? -gt 0 ]; then
	cat <<EOF >&2
---
The following translation (.po) file appears to be invalid.$branch_message

$path

The results of the validation follow. Please correct the errors on the line numbers mentioned and try to push again.

$result

To check this locally before attempting to push again, you can use the following command:

msgfmt $dash_c $basename

After making fixes, modify your commit to include them, by doing:

git add $basename
git commit --amend

If you have any further problems or questions, please contact the GNOME Translation Project mailing list <gnome-i18n@gnome.org>. Thank you.
---
EOF
	exit 1
    fi

     # Check for the absence of an executable flag
    if expr "$mode" : ".*\([1357]..\|[1357].\|[1357]\)$" > /dev/null 2>& 1; then
	cat <<EOF >&2
---
The following translation file appears to have its executable flag set.$branch_message

$path

Translation files should not be executable. Please remove the flag and try to push again. The following commands may help:

chmod a-x $basename
git add $basename
git commit --amend

If you have any further problems or questions, please contact the GNOME Translation Project mailing list <gnome-i18n@gnome.org>. Thank you.
---
EOF
	exit 1
    fi
}

check_pos() {
    oldrev=$1
    newrev=$2
    refname=$3

    branchname=${refname#refs/heads/}
    if [ "$branchname" = "$refname" ] ; then
        # not a branch update
	return
    fi

    branch_message=
    if [ "x$branchname" != "master" ] ; then
	branch_message=" (When updating branch '$branchname'.)"
    fi

    if expr $newrev : "^0\+$" > /dev/null 2>&1; then
        # Branch deletion, nothing to check
	return 0
    fi

    if expr $oldrev : "^0\+$" > /dev/null 2>&1; then
	# Branch creation
	git ls-tree -r $newrev | (
	    while read mode objtype sha path ; do
		if [ $objtype = blob ] ; then
		    check_po $newrev $path $mode
		fi
	    done
	)
    else
	# Branch update
	git diff-tree -r $oldrev $newrev | (
	    while read srcmode destmode srcsha destsha status srcpath destpath ; do
		if [ $status = 'D' ] ; then
		    continue # deleted
		fi

		# destpath only present for copies/renames
		if [ x"$destpath" = x ] ; then
		    destpath=$srcpath
		fi

		# Strip colon from the source mode
		srcmode=${srcmode#:}

		check_po $newrev $destpath $destmode
	    done
	)
    fi

}

# Use a newer version of the gettext tools than the ones shipped with RHEL 5
PATH=/usr/libexec/gettext17:$PATH

GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)

# Don't check .po's during import; we don't want to enforce correct
# .po files for some ancient historical branch
if [ -e $GIT_DIR/pending ] ; then
    exit 0
fi

if [ $# = 3 ] ; then
    check_pos $@ || exit 1
else
    while read oldrev newrev refname; do
	check_pos $oldrev $newrev $refname || exit 1
    done
fi