#!/bin/bash
# $Id$
#
# Copyright 2005, Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Written by Aron Griffis <agriffis@gentoo.org>
#
# eviewcvs - generate viewcvs urls for some files
#

if [[ -t 1 ]]; then
    blue=""
    cyan=""
    green=""
    red=""
    off=""
else
    unset blue cyan green red off
fi

startdir="$PWD"
url="http://sources.gentoo.org/viewcvs.py"
unset diffs
declare -a hdr orev

chdir() {
    cd "$1" || return

    # Figure out where we are, hopefully
    unset cwd root
    if [[ -f CVS/Repository ]]; then
        cwd=$(<CVS/Repository)
    elif [[ -f .svn/entries ]]; then
        cwd=$(grep -om1 'url=.*' .svn/entries)
        cwd=${cwd#*/var/svnroot/}
        cwd=${cwd%\"*}
    fi
}

# Default to all files in directory
[[ -n $* ]] || set -- *

for f in "$@"; do
    [[ -f $f ]] || continue

    # Determine the directory settings
    if [[ $f == */* ]]; then
        chdir ${f%/*}
        f=${f##*/}
    else
        chdir ${startdir}
    fi

    # Default to the directory settings
    fwd=$cwd

    # Get the header for this file, from which we can extract the root,
    # directory and revision
    hdr=( $(egrep -m1 -o '\$(Header|Id):[^$]*\$' "$f") )
    frev=${hdr[2]}
    case ${hdr[*]} in
        \$Header:\ /var/cvsroot/*/*\ \$*)
            fwd=${hdr[1]}                       # /var/cvsroot/gentoo-src/keychain/keychain.sh,v
            fwd=${fwd#/var/cvsroot/}            # gentoo-src/keychain/keychain.sh,v
            fwd=${fwd%/*}                       # gentoo-src/keychain
            ;;
        '')
            if [[ -d CVS ]]; then
                frev=$(cvs log "$f" 2>/dev/null | awk '/^head:/{print $2}')
            elif [[ -d .svn ]]; then
                frev=$(svn info "$f" 2>/dev/null | awk '/^Revision:/{print $2}')
            fi
            ;;
    esac
    [[ -n ${frev} ]] || continue

    # Here is the simple URL to view it
    echo "${url}/${fwd:+$fwd/}${green}${f}${off}?rev=${frev}&view=markup"

    # Also supply a diff URL if possible
    if [[ ${frev##*.} -gt 1 ]]; then
        orev=( ${frev//./ } )           # convert to array
        (( orev[${#orev[@]}-1]-- ))     # decrement the last element
        orev=${orev[*]}                 # convert to string
        orev=${orev// /.}               # revert spaces to dots
        diffs="${diffs:+$diffs
}${url}/${fwd:+$fwd/}${blue}${f}${off}?r1=${orev}&r2=${frev}"
    fi
done

if [[ -n ${diffs} ]]; then
    echo "${diffs}"
fi

# vim:set expandtab sw=4 smarttab: