Add autocompletion for Fish Shell

.github/workflows/main.yml

@@ -27,4 +27,4 @@ jobs:
       - name: Run Shellcheck
         run: |
           ./shellcheck --version
-          ./shellcheck -e SC2148 wt completions/*
+          ./shellcheck -e SC2148 wt completions/_wt_completion completions/wt_completion

README.md

@@ -41,6 +41,11 @@ sudo cp completions/_wt_completion <one-of-$fpath>
 
 exec zsh
 ```
+
+**For Fish**
+```bash
+cp completions/wt.fish ~/.config/fish/completions
+```
 ---
 Tab autocompletion works for switching between your worktrees.
 ```bash

completions/wt.fish

@@ -0,0 +1,16 @@
+# AUTOCOMPLETION FOR FISH
+# Reference: https://fishshell.com/docs/current/completions.html
+
+# wt list: list all the available worktrees
+# | awk '{ print $1; }': grab the first column of the output
+# | tr "\n" " ": replace line break character with space to put the worktrees on single line
+# separated by space
+
+set list (wt list | awk '{ print $1; }' | tr "\n" " ")
+set opts ""
+
+for item in (string split " " "$list")
+   set -a opts (basename -- "$item")
+end
+
+complete -c wt -f -a "$opts"