1 files changed, 69 insertions, 0 deletions
diff --git a/install/fish.go b/install/fish.go
new file mode 100644
index 0000000..2b64bfc
--- /dev/null
+++ b/install/fish.go
@@ -0,0 +1,69 @@
+package install
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"text/template"
+)
+
+// (un)install in fish
+
+type fish struct {
+	configDir string
+}
+
+func (f fish) IsInstalled(cmd, bin string) bool {
+	completionFile := f.getCompletionFilePath(cmd)
+	if _, err := os.Stat(completionFile); err == nil {
+		return true
+	}
+	return false
+}
+
+func (f fish) Install(cmd, bin string) error {
+	if f.IsInstalled(cmd, bin) {
+		return fmt.Errorf("already installed at %s", f.getCompletionFilePath(cmd))
+	}
+
+	completionFile := f.getCompletionFilePath(cmd)
+	completeCmd, err := f.cmd(cmd, bin)
+	if err != nil {
+		return err
+	}
+
+	return createFile(completionFile, completeCmd)
+}
+
+func (f fish) Uninstall(cmd, bin string) error {
+	if !f.IsInstalled(cmd, bin) {
+		return fmt.Errorf("does not installed in %s", f.configDir)
+	}
+
+	completionFile := f.getCompletionFilePath(cmd)
+	return os.Remove(completionFile)
+}
+
+func (f fish) getCompletionFilePath(cmd string) string {
+	return filepath.Join(f.configDir, "completions", fmt.Sprintf("%s.fish", cmd))
+}
+
+func (f fish) cmd(cmd, bin string) (string, error) {
+	var buf bytes.Buffer
+	params := struct{ Cmd, Bin string }{cmd, bin}
+	tmpl := template.Must(template.New("cmd").Parse(`
+function __complete_{{.Cmd}}
+    set -lx COMP_LINE (commandline -cp)
+    test -z (commandline -ct)
+    and set COMP_LINE "$COMP_LINE "
+    {{.Bin}}
+end
+complete -f -c {{.Cmd}} -a "(__complete_{{.Cmd}})"
+`))
+	err := tmpl.Execute(&buf, params)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}