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#!/bin/bash
# emacs-pkg-subtree --- manage Emacs packages as git subtrees in your dotfiles git repo
# Author/maintainer : Sean Whitton <spwhitton@spwhitton.name>
# Instructions for use : https://spwhitton.name/blog/entry/emacs-pkg-subtree/
# Copyright (C) 2015 Sean Whitton. Released under the GNU GPL 3.
DEST="$HOME/src/dotfiles/.emacs.d/pkg"
set -e
if [ "$3" = "" ]; then
echo "$(basename $0): usage: $(basename $0) add|pull git_clone_uri ref" >&2
exit 1
fi
cd $DEST
op="$1"
uri="$2"
repo="$(basename $2)"
pkg="${repo%%\.git}"
ref="$3"
top="$(git rev-parse --show-toplevel)"
prefix="${DEST##$top/}/$pkg"
cd $top
clean="$(git status --porcelain)"
if [ ! -z "$clean" ]; then
echo "commit first" >&2
exit 1
fi
if [ "$op" = "add" ]; then
if [ ! -e "$DEST/$pkg" ]; then
git subtree add --squash --prefix $prefix $uri $ref
echo "$uri $ref" >> $DEST/subtrees
git add $DEST/subtrees
git commit -m "updated Emacs packages record"
else
echo "you already have a subtree by that name" >&2
exit 1
fi
elif [ "$op" = "pull" ]; then
git subtree pull --squash --prefix $prefix $uri $ref
sed -i -e "s|^${uri} .*$|${uri} ${ref}|" $DEST/subtrees
git add $DEST/subtrees
git commit -m "updated Emacs packages record"
else
echo "$(basename $0): usage: $(basename $0) add|pull git_clone_uri ref" >&2
exit 1
fi
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