#!/bin/bash -l
# Copyright (C) 2016 Ian Kelling

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# my projects all have README or --help with a short single line
# description which I parse and put into the gitweb description.

# If it's a repo with just a single bash script or *-function script,
# then call it with --help, grap the 2nd line.
# else, parse the readme, find the first non blank, not starting with [#*],
# and use that line.

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

if [[ ! $1 ]]; then
    echo "need gitroot arg"
    exit 1
fi

gitroot=$1
cd $gitroot

shopt -s extglob

_git_desc_readme() {
    while read -r line; do
        [[ $line ]] || continue
        if echo "$line" | grep "^ *[#*]" &>/dev/null; then
            continue
        fi
        echo "$line" > .git/description
        break
    done < README*
}

dirs=()
for d in $gitroot/*; do
    if [[ -d $d && ! -L $d ]]; then
        for sub in $d/*; do
            dirs+=($sub)
        done
    else
        dirs+=($d)
    fi
done

gitweb-descriptions() {
    for d in ${dirs[@]}; do
        d=$(readlink -f $d)
        cd $d/..
        e ${PWD##*/}
        shopt -s nullglob
        f=(!(LICENSE|COPYING|README|.git))
        shopt -u nullglob
        if [[ ${#f[@]} == 1 && ! -d $f ]]; then
            if [[ ! -x $f ]]; then
                if [[ $f == *-function ]]; then
                    ${f%-function} --help | sed -n '2p' > .git/description
                else
                    _git_desc_readme
                fi
            else
                ./$f --help | sed -n '2p' > .git/description
            fi
        else
            _git_desc_readme
        fi
    done
}
gitweb-descriptions "$@"