feat: add zsh completions (#10040)

Co-authored-by: Henrique Dias <hacdias@gmail.com>

.github/workflows/gotest.yml

@@ -35,6 +35,8 @@ jobs:
           go-version: 1.19.x
       - name: Check out Kubo
         uses: actions/checkout@v3
+      - name: Install missing tools
+        run: sudo apt update && sudo apt install -y zsh
       - name: Restore Go cache
         uses: protocol/cache-go-action@v1
         with:

core/commands/commands.go

@@ -13,7 +13,7 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/ipfs/go-ipfs-cmds"
+	cmds "github.com/ipfs/go-ipfs-cmds"
 )
 
 type commandEncoder struct {
@@ -169,6 +169,33 @@ To install the completions permanently, they can be moved to
 					return res.Emit(&buf)
 				},
 			},
+			"zsh": {
+				Helptext: cmds.HelpText{
+					Tagline:          "Generate zsh shell completions.",
+					ShortDescription: "Generates command completions for the zsh shell.",
+					LongDescription: `
+Generates command completions for the zsh shell.
+
+The simplest way to see it working is write the completions
+to a file and then source it:
+
+  > ipfs commands completion zsh > ipfs-completion.zsh
+  > source ./ipfs-completion.zsh
+
+To install the completions permanently, they can be moved to
+/etc/zsh/completions or sourced from your ~/.zshrc file.
+`,
+				},
+				NoRemote: true,
+				Run: func(req *cmds.Request, res cmds.ResponseEmitter, env cmds.Environment) error {
+					var buf bytes.Buffer
+					if err := writeZshCompletions(root, &buf); err != nil {
+						return err
+					}
+					res.SetLength(uint64(buf.Len()))
+					return res.Emit(&buf)
+				},
+			},
 			"fish": {
 				Helptext: cmds.HelpText{
 					Tagline:          "Generate fish shell completions.",

core/commands/commands_test.go

@@ -25,6 +25,7 @@ func TestROCommands(t *testing.T) {
 		"/commands/completion",
 		"/commands/completion/bash",
 		"/commands/completion/fish",
+		"/commands/completion/zsh",
 		"/dag",
 		"/dag/get",
 		"/dag/resolve",
@@ -102,6 +103,7 @@ func TestCommands(t *testing.T) {
 		"/commands/completion",
 		"/commands/completion/bash",
 		"/commands/completion/fish",
+		"/commands/completion/zsh",
 		"/config",
 		"/config/edit",
 		"/config/profile",

core/commands/completion.go

@@ -83,7 +83,7 @@ func commandToCompletions(name string, fullName string, cmd *cmds.Command) *comp
 	return parsed
 }
 
-var bashCompletionTemplate, fishCompletionTemplate *template.Template
+var bashCompletionTemplate, fishCompletionTemplate, zshCompletionTemplate *template.Template
 
 func init() {
 	commandTemplate := template.Must(template.New("command").Parse(`
@@ -153,6 +153,28 @@ _ipfs() {
   {{ template "command" . }}
 }
 complete -o nosort -o nospace -o default -F _ipfs ipfs
+`))
+
+	zshCompletionTemplate = template.Must(commandTemplate.New("root").Parse(`#!bin/zsh
+autoload bashcompinit
+bashcompinit
+_ipfs_compgen() {
+local oldifs="$IFS"
+IFS=$'\n'
+while read -r line; do
+	COMPREPLY+=("$line")
+done < <(compgen "$@")
+IFS="$oldifs"
+}
+
+_ipfs() {
+COMPREPLY=()
+local index=1
+local argidx=0
+local word="${COMP_WORDS[COMP_CWORD]}"
+{{ template "command" . }}
+}
+complete -o nosort -o nospace -o default -F _ipfs ipfs
 `))
 
 	fishCommandTemplate := template.Must(template.New("command").Parse(`
@@ -221,3 +243,8 @@ func writeFishCompletions(cmd *cmds.Command, out io.Writer) error {
 	cmds := commandToCompletions("ipfs", "", cmd)
 	return fishCompletionTemplate.Execute(out, cmds)
 }
+
+func writeZshCompletions(cmd *cmds.Command, out io.Writer) error {
+	cmds := commandToCompletions("ipfs", "", cmd)
+	return zshCompletionTemplate.Execute(out, cmds)
+}

docs/command-completion.md

@@ -24,3 +24,16 @@ The simplest way to use the completions logic:
 
 To install the completions permanently, they can be moved to
 `/etc/fish/completions` or `~/.config/fish/completions` or sourced from your `~/.config/fish/config.fish` file.
+
+## ZSH
+
+The zsh shell is also supported:
+
+The simplest way to "eval" the completions logic:
+
+```bash
+> eval "$(ipfs commands completion zsh)"
+```
+
+To install the completions permanently, they can be moved to
+`/etc/bash_completion.d` or sourced from your `~/.zshrc` file.

test/cli/completion_test.go

@@ -29,3 +29,29 @@ func TestBashCompletion(t *testing.T) {
 		assert.NoError(t, res.Err)
 	})
 }
+
+func TestZshCompletion(t *testing.T) {
+	t.Parallel()
+	h := harness.NewT(t)
+	node := h.NewNode()
+
+	res := node.IPFS("commands", "completion", "zsh")
+
+	length := len(res.Stdout.String())
+	if length < 100 {
+		t.Fatalf("expected a long Bash completion file, but got one of length %d", length)
+	}
+
+	t.Run("completion file can be loaded in bash", func(t *testing.T) {
+		RequiresLinux(t)
+
+		completionFile := h.WriteToTemp(res.Stdout.String())
+		res = h.Runner.Run(harness.RunRequest{
+			Path: "zsh",
+			Args: []string{"-c", fmt.Sprintf("autoload -Uz compinit && compinit && source %s && echo -E $_comps[ipfs]", completionFile)},
+		})
+
+		assert.NoError(t, res.Err)
+		assert.NotEmpty(t, res.Stdout.String())
+	})
+}