Add keybinding ctrl+y for copying stash ID in gss (#295)

Author: carlfriedrich

README.md

@@ -122,13 +122,13 @@ Install `forgit` in just one click.
 | <kbd>Alt</kbd> - <kbd>W</kbd>                 | Toggle preview wrap       |
 | <kbd>Ctrl</kbd> - <kbd>S</kbd>                | Toggle sort               |
 | <kbd>Ctrl</kbd> - <kbd>R</kbd>                | Toggle selection          |
-| <kbd>Ctrl</kbd> - <kbd>Y</kbd>                | Copy commit hash*         |
+| <kbd>Ctrl</kbd> - <kbd>Y</kbd>                | Copy commit hash/stash ID*|
 | <kbd>Ctrl</kbd> - <kbd>K</kbd> / <kbd>P</kbd> | Selection move up         |
 | <kbd>Ctrl</kbd> - <kbd>J</kbd> / <kbd>N</kbd> | Selection move down       |
 | <kbd>Alt</kbd> - <kbd>K</kbd> / <kbd>P</kbd>  | Preview move up           |
 | <kbd>Alt</kbd> - <kbd>J</kbd> / <kbd>N</kbd>  | Preview move down         |
 
-\* Available when the selection contains a commit hash.
+\* Available when the selection contains a commit hash or a stash ID.
 For linux users `FORGIT_COPY_CMD` should be set to make copy work. Example: `FORGIT_COPY_CMD='xclip -selection clipboard'`.
 
 ### ⚙  Options

bin/git-forgit

@@ -217,6 +217,7 @@ _forgit_stash_show() {
     opts="
         $FORGIT_FZF_DEFAULT_OPTS
         +s +m -0 --tiebreak=index --bind=\"enter:execute($cmd | $_forgit_enter_pager)\"
+        --bind=\"ctrl-y:execute-silent(echo {} | cut -d: -f1 | tr -d '[:space:]' | ${FORGIT_COPY_CMD:-pbcopy})\"
         --preview=\"$cmd\"
         $FORGIT_STASH_FZF_OPTS
     "