shell/fish: impl SpawnRunner

shell/fish.go

@@ -74,6 +74,7 @@ var fishTemplate, fishHistoryTemplate, fishRunTemplate *template.Template
 
 func init() {
 	fishTemplate = template.Must(template.New("fish").Parse(fishBaseScript + fishRecordSetup))
+	fishRunTemplate = template.Must(template.New("fishRun").Parse(fishBaseScript + fishRunRunbookScript))
 }
 
 // Spawn starts a fish shell.
@@ -114,8 +115,51 @@ func (f *fish) SpawnHistoryExpander(ctx context.Context) (*exec.Cmd, error) {
 	return nil, nil
 }
 
+const fishRunRunbookScript = `
+if not functions -q __savvy_run_pre_exec__
+    set_color red
+    echo " Your shell is not configured to use Savvy. Please run the following commands: "
+    set_color normal
+    echo
+    set_color red
+    echo "> echo 'savvy init fish | source' >> ~/.config/fish/config.fish"
+    echo "> source ~/.config/fish/config.fish"
+    set_color normal
+    exit 1
+end
+
+echo
+echo "Type 'exit' or press 'ctrl+d' to stop running."
+echo
+`
+
 func (f *fish) SpawnRunbookRunner(ctx context.Context, runbook *client.Runbook) (*exec.Cmd, error) {
-	return nil, nil
+	tmpDir := os.TempDir()
+	fishVendorConfDir := filepath.Join(tmpDir, "fish", "vendor_conf.d")
+	if err := os.MkdirAll(fishVendorConfDir, 0755); err != nil {
+		return nil, err
+	}
+	fishrc, err := os.CreateTemp(fishVendorConfDir, "savvy-fishrc-*.fish")
+	if err != nil {
+		return nil, err
+	}
+	defer fishrc.Close()
+
+	if err := fishRunTemplate.Execute(fishrc, f); err != nil {
+		return nil, err
+	}
+
+	dataDirs := os.Getenv("XDG_DATA_DIRS")
+	if dataDirs == "" {
+		dataDirs = fishVendorConfDir
+	} else {
+		dataDirs = strings.Join([]string{dataDirs, fishVendorConfDir}, ":")
+	}
+	cmd := exec.CommandContext(ctx, f.shellCmd)
+	cmd.Env = append(os.Environ(), "SAVVY_CONTEXT=run", fmt.Sprintf("XDG_DATA_DIRS=%s", dataDirs))
+	cmd.Env = append(cmd.Env, runbookRunMetadata(runbook, f)...)
+	cmd.WaitDelay = 500 * time.Millisecond
+	return cmd, nil
 }
 
 func (f *fish) DefaultStartingArrayIndex() int {