Enable loading non-powerline themes via TMP

Without break backwards compatibility.

Should fix issue #6.

README.md

@@ -25,10 +25,11 @@ A pack of various themes for Tmux.
 
 You can pick and choose a theme via `.tmux.conf` option:
 
-- `set -g @themepack 'block/blue'` (default)
-- `set -g @themepack 'block/cyan'`
-- `set -g @themepack 'default/gray'`
-- `set -g @themepack 'double/megenta'`
+- `set -g @themepack 'basic'` (default)
+- `set -g @themepack 'powerline/block/blue'`
+- `set -g @themepack 'powerline/block/cyan'`
+- `set -g @themepack 'powerline/default/gray'`
+- `set -g @themepack 'powerline/double/megenta'`
 - `...`
 
 ## Themes

themepack.tmux

@@ -3,21 +3,27 @@
 CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 theme_option="@themepack"
-default_theme='block/blue'
+default_theme='basic'
 
 get_tmux_option() {
-	local option="$1"
-	local default_value="$2"
-	local option_value="$(tmux show-option -gqv "$option")"
-	if [ -z "$option_value" ]; then
-		echo "$default_value"
-	else
-		echo "$option_value"
-	fi
+  local option="$1"
+  local default_value="$2"
+  local option_value="$(tmux show-option -gqv "$option")"
+
+  if [ -n "$option_value" ]; then
+    echo "$option_value"
+  else
+    echo "$default_value"
+  fi
 }
 
 main() {
-	local theme="$(get_tmux_option "$theme_option" "$default_theme")"
-	tmux source-file "$CURRENT_DIR/powerline/${theme}.tmuxtheme"
+  local theme="$(get_tmux_option "$theme_option" "$default_theme")"
+  if [ -f "$CURRENT_DIR/${theme}.tmuxtheme" ]; then
+    tmux source-file "$CURRENT_DIR/${theme}.tmuxtheme"
+  else
+    tmux source-file "$CURRENT_DIR/powerline/${theme}.tmuxtheme"
+  fi
 }
+
 main