fix: Add shell completion installation to Homebrew formula (#204)

Co-authored-by: Claude <[email protected]>

Author: koki-develop

.gitignore

@@ -1,2 +1,3 @@
 /gat
 /dist/
+/completions/

.goreleaser.yaml

@@ -3,6 +3,7 @@ version: 2
 before:
   hooks:
     - go mod tidy
+    - ./scripts/build-completions.sh
 builds:
   - ldflags:
       - -s -w -X github.com/koki-develop/gat/cmd.version=v{{.Version}}
@@ -15,6 +16,8 @@ builds:
 
 archives:
   - formats: [tar.gz]
+    files:
+      - completions/*
     name_template: >-
       {{ .ProjectName }}_
       {{- title .Os }}_
@@ -40,3 +43,8 @@ brews:
       name: homebrew-tap
       token: "{{ .Env.TAP_GITHUB_TOKEN }}"
     directory: Formula
+    install: |
+      bin.install "gat"
+      bash_completion.install "completions/gat.bash" => "gat"
+      zsh_completion.install "completions/gat.zsh" => "_gat"
+      fish_completion.install "completions/gat.fish"

scripts/build-completions.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -euo pipefail
+
+rm -rf completions
+mkdir completions
+
+go build .
+
+./gat completion bash > completions/gat.bash
+./gat completion zsh  > completions/gat.zsh
+./gat completion fish > completions/gat.fish