#!/bin/sh
#
# func/giturl
#
# A convenient way to display the gitweb URL of a commit-ish, as well as the
# base URL and tree. Also for each argument, the tree or blob URL is printed.
#
# Copyright © 2010 martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
# Contributions from Yaroslav O. Halchenko <debian@onerussian.com>
#
# Source repository: http://git.madduck.net/v/etc/zsh.git
#

local branch remote remote_name
branch=$(git symbolic-ref -q HEAD); branch="${branch#refs/heads/}"
# Obtain remote which current branch tracks, origin if not known
remote_name=$(git config branch.$branch.remote || echo origin)
remote=$(git config --get remote.$remote_name.url)

local part gitweb_base style commitkw
style=gitweb
commitkw=commitdiff          # keyword for commit -- differ for github
argssep=:                    # separator for arguments of the query
case "$remote" in
  madduck:pub/*|ssh://git.madduck.net/madduck/pub/*)
    gitweb_base=http://git.madduck.net/v
    part="${remote#madduck:pub/}"
    part="${part#ssh://git.madduck.net/madduck/pub/}"
    part="${part%.git}.git"
    ;;
  debian:*|*://git.debian.org/git/*|*://alioth.debian.org/git/*|*@git.debian.org/git/*)
    gitweb_base=http://git.debian.org
    part="${remote#debian:}"
    part="${part#*://git.debian.org/git/}"
    part="${part#*://alioth.debian.org/git/}"
    part="${part#*@git.debian.org/git/}"
    part="${part%.git}.git"
    style=gitweb_old
    ;;
  github:*|*://github.com/*|*@github.com[/:]*)
    gitweb_base=http://github.com
    part="${remote#github:}"
    part="${part#*://github.com/}"
    part="${part#*@github.com[:/]}"
    part="${part%.git}"
    style=github
    commitkw=commit
    argssep=
    ;;
  *)
    echo >&2 "E: I do not know how to translate $remote into a gitweb URL."
    return 1
    ;;
esac

local hash
hash=$(git rev-parse HEAD)

case "$style" in
  gitweb|github)
    echo "$gitweb_base/$part"
    echo "$gitweb_base/$part/$commitkw/$hash"
    echo "$gitweb_base/$part/tree/HEAD"
    for i in $@; do
      [ -f "$i" ] && echo "$gitweb_base/$part/blob/HEAD${argssep}/$i"
      [ -d "$i" ] && echo "$gitweb_base/$part/tree/HEAD${argssep}/$i"
    done
    ;;
  gitweb_old)
    echo "$gitweb_base/?p=$part"
    echo "$gitweb_base/?p=$part;a=commitdiff;h=$hash"
    echo "$gitweb_base/?p=$part;a=tree;h=HEAD"
    for i in $@; do
      [ -f "$i" ] && echo "$gitweb_base/?p=$part;a=blob;hb=HEAD;f=$i"
      [ -d "$i" ] && echo "$gitweb_base/?p=$part;a=tree;hb=HEAD;f=$i"
    done
    ;;
esac