ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/scripts/env b/scripts/env
new file mode 100755
index 0000000..5987b41
--- /dev/null
+++ b/scripts/env
@@ -0,0 +1,226 @@
+#!/usr/bin/env bash
+BASEDIR="$PWD"
+ENVDIR="$PWD/env"
+export GREP_OPTIONS=
+
+usage() {
+ cat <<EOF
+Usage: $0 [options] <command> [arguments]
+Commands:
+ help This help text
+ list List environments
+ clear Delete all environment and revert to flat config/files
+ new <name> Create a new environment
+ switch <name> Switch to a different environment
+ delete <name> Delete an environment
+ rename <newname> Rename the current environment
+ diff Show differences between current state and environment
+ save [message] Save your changes to the environment, optionally using
+ the given commit message
+ revert Revert your changes since last save
+
+Options:
+
+EOF
+ exit "${1:-1}"
+}
+
+error() {
+ echo "$0: $*"
+ exit 1
+}
+
+ask_bool() {
+ local DEFAULT="$1"; shift
+ local def defstr val
+ case "$DEFAULT" in
+ 1) def=0; defstr="Y/n";;
+ 0) def=1; defstr="y/N";;
+ *) def=; defstr="y/n";;
+ esac
+ while [ -z "$val" ]; do
+ local VAL
+
+ echo -n "$* ($defstr): "
+ read -r VAL
+ case "$VAL" in
+ y*|Y*) val=0;;
+ n*|N*) val=1;;
+ *) val="$def";;
+ esac
+ done
+ return "$val"
+}
+
+env_init() {
+ local CREATE="$1"
+ if [ -z "$CREATE" ]; then
+ [ -d "$ENVDIR" ] || exit 0
+ fi
+ command -v git >/dev/null || error "Git is not installed"
+ mkdir -p "$ENVDIR" || error "Failed to create the environment directory"
+ cd "$ENVDIR" || error "Failed to switch to the environment directory"
+ [ -d .git ] || {
+ git init -b master &&
+ touch .config &&
+ mkdir files &&
+ git add . &&
+ git commit -q -m "Initial import"
+ } || {
+ rm -rf .git
+ error "Failed to initialize the environment directory"
+ }
+}
+
+env_sync_data() {
+ [ ! -L "$BASEDIR/.config" ] && [ -f "$BASEDIR/.config" ] && mv "$BASEDIR/.config" "$ENVDIR"
+ git add .
+ git add -u
+}
+
+env_sync() {
+ local STR="$1"
+ env_sync_data
+ git commit -m "${STR:-Update} at $(date)"
+}
+
+env_link_config() {
+ rm -f "$BASEDIR/.config"
+ ln -s env/.config "$BASEDIR/.config"
+ mkdir -p "$ENVDIR/files"
+ [ -L "$BASEDIR/files" ] || ln -s env/files "$BASEDIR/files"
+}
+
+env_do_reset() {
+ git reset --hard HEAD
+ git clean -d -f
+}
+
+env_list() {
+ env_init
+ git branch --color | grep -vE '^. master$'
+}
+
+env_diff() {
+ env_init
+ env_sync_data
+ git diff --cached --color=auto
+ env_link_config
+}
+
+env_save() {
+ env_init
+ env_sync "$@"
+ env_link_config
+}
+
+env_revert() {
+ env_init
+ env_do_reset
+ env_link_config
+}
+
+env_ask_sync() {
+ env_sync_data
+ LINES="$(env_diff | wc -l)" # implies env_init
+ [ "$LINES" -gt 0 ] && {
+ if ask_bool 1 "Do you want to save your changes"; then
+ env_sync
+ else
+ env_do_reset
+ fi
+ }
+}
+
+env_clear() {
+ env_init
+ [ -L "$BASEDIR/.config" ] && rm -f "$BASEDIR/.config"
+ [ -L "$BASEDIR/files" ] && rm -f "$BASEDIR/files"
+ [ -f "$ENVDIR/.config" ] || ( cd "$ENVDIR/files" && find . | grep -vE '^\.$' > /dev/null )
+ env_sync_data
+ if ask_bool 1 "Do you want to keep your current config and files"; then
+ mkdir -p "$BASEDIR/files"
+ shopt -s dotglob
+ cp -a "$ENVDIR/files/"* "$BASEDIR/files" 2>/dev/null >/dev/null
+ shopt -u dotglob
+ cp "$ENVDIR/.config" "$BASEDIR/"
+ else
+ rm -rf "$BASEDIR/files" "$BASEDIR/.config"
+ fi
+ cd "$BASEDIR" || exit 1
+ rm -rf "$ENVDIR"
+}
+
+env_delete() {
+ local name="${1##*/}"
+ env_init
+ [ -z "$name" ] && usage
+ branch="$(git branch | grep '^\* ' | awk '{print $2}')"
+ [ "$name" = "$branch" ] && error "cannot delete the currently selected environment"
+ git branch -D "$name"
+}
+
+env_switch() {
+ local name="${1##*/}"
+ [ -z "$name" ] && usage
+
+ env_init
+ env_ask_sync
+ git checkout "$name" || error "environment '$name' not found"
+ env_link_config
+}
+
+env_rename() {
+ local NAME="${1##*/}"
+ env_init
+ git branch -m "$NAME"
+}
+
+env_new() {
+ local NAME="$1"
+ local branch
+ local from="master"
+
+ [ -z "$NAME" ] && usage
+ env_init 1
+
+ branch="$(git branch | grep '^\* ' | awk '{print $2}')"
+ if [ -n "$branch" ] && [ "$branch" != "master" ]; then
+ env_ask_sync
+ if ask_bool 0 "Do you want to clone the current environment?"; then
+ from="$branch"
+ fi
+ rm -f "$BASEDIR/.config" "$BASEDIR/files"
+ fi
+ git checkout -b "$1" "$from"
+ if [ -f "$BASEDIR/.config" ] || [ -d "$BASEDIR/files" ]; then
+ if ask_bool 1 "Do you want to start your configuration repository with the current configuration?"; then
+ if [ -d "$BASEDIR/files" ] && [ ! -L "$BASEDIR/files" ]; then
+ mkdir -p "$ENVDIR/files"
+ shopt -s dotglob
+ mv "$BASEDIR/files/"* "$ENVDIR/files/" 2>/dev/null
+ shopt -u dotglob
+ rmdir "$BASEDIR/files"
+ fi
+ env_sync
+ else
+ rm -rf "$BASEDIR/.config" "$BASEDIR/files"
+ fi
+ fi
+ env_link_config
+}
+
+COMMAND="$1"; shift
+case "$COMMAND" in
+ help) usage 0;;
+ new) env_new "$@";;
+ list) env_list "$@";;
+ clear) env_clear "$@";;
+ switch) env_switch "$@";;
+ delete) env_delete "$@";;
+ rename) env_rename "$@";;
+ diff) env_diff "$@";;
+ save) env_save "$@";;
+ revert) env_revert "$@";;
+ *) usage;;
+esac