initial

tmux/powerline/segments/vcs_compare.sh

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+# This checks if the current branch is ahead of
+# or behind the remote branch with which it is tracked
+
+# Source lib to get the function get_tmux_pwd
+source "${TMUX_POWERLINE_DIR_LIB}/tmux_adapter.sh"
+
+flat_symbol="⤚"
+
+run_segment() {
+	tmux_path=$(get_tmux_cwd)
+	cd "$tmux_path"
+	stats=""
+	if [ -n "${git_stats=$(__parse_git_stats)}" ]; then
+		stats="$git_stats"
+	elif [ -n "${svn_stats=$(__parse_svn_stats)}" ]; then
+		stats="$svn_stats"
+	elif [ -n "${hg_stats=$(__parse_hg_stats)}" ]; then
+		stats="$hg_stats"
+	fi
+
+	if [ -n "$stats" ]; then
+		echo "${stats}"
+	fi
+	return 0
+}
+
+__parse_git_stats() {
+	type git >/dev/null 2>&1
+	if [ "$?" -ne 0 ]; then
+		return
+	fi
+
+	# check if git
+	[[ -z $(git rev-parse --git-dir 2> /dev/null) ]] && return
+
+	symbolic_ref=$(git symbolic-ref -q HEAD)
+	[[ -z "${symbolic_ref}" ]] && return
+
+	tracking_branch=$(git for-each-ref --format='%(upstream:short)' ${symbolic_ref})
+
+	# creates global variables $1 and $2 based on left vs. right tracking
+	set -- $(git rev-list --left-right --count $tracking_branch...HEAD)
+
+	behind=$1
+	ahead=$2
+
+	# print out the information
+	if [[ $behind -gt 0 ]] ; then
+		local ret="↓ $behind"
+	fi
+	if [[ $ahead -gt 0 ]] ; then
+		local ret="${ret}↑ $ahead"
+	fi
+	echo "$ret"
+}
+
+__parse_hg_stats() {
+	type hg >/dev/null 2>&1
+	if [ "$?" -ne 0 ]; then
+		return
+	fi
+	# not yet implemented
+}
+
+__parse_svn_stats() {
+	type svn >/dev/null 2>&1
+	if [ "$?" -ne 0 ]; then
+		return
+	fi
+	# not yet implemented
+}