From c6b7e3d74ac1c7b0a5b6136a5dbcbb8c84249e7b Mon Sep 17 00:00:00 2001
From: V <v@anomalous.eu>
Date: Sun, 6 Sep 2020 14:15:53 +0200
Subject: [PATCH] Add :alt command for go files

---
 rc/filetype/go.kak | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/rc/filetype/go.kak b/rc/filetype/go.kak
index 5d077991f..c62d45e1b 100644
--- a/rc/filetype/go.kak
+++ b/rc/filetype/go.kak
@@ -22,7 +22,12 @@ hook global WinSetOption filetype=go %{
     hook window InsertChar \{ -group go-indent go-indent-on-opening-curly-brace
     hook window InsertChar \} -group go-indent go-indent-on-closing-curly-brace
 
-    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window go-.+ }
+    alias window alt go-alternative-file
+
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-hooks window go-.+
+        unalias window alt go-alternative-file
+    }
 }
 
 hook -group go-highlight global WinSetOption filetype=go %{
@@ -73,6 +78,23 @@ evaluate-commands %sh{
 # Commands
 # ‾‾‾‾‾‾‾‾
 
+define-command go-alternative-file -docstring 'Jump to the alternate file (implementation ↔ test)' %{ evaluate-commands %sh{
+    case $kak_buffile in
+        *_test.go)
+            altfile=${kak_buffile%_test.go}.go
+            test ! -f "$altfile" && echo "fail 'implementation file not found'" && exit
+        ;;
+        *.go)
+            altfile=${kak_buffile%.go}_test.go
+            test ! -f "$altfile" && echo "fail 'test file not found'" && exit
+        ;;
+        *)
+            echo "fail 'alternative file not found'" && exit
+        ;;
+    esac
+    printf "edit -- '%s'" "$(printf %s "$altfile" | sed "s/'/''/g")"
+}}
+
 define-command -hidden go-indent-on-new-line %~
     evaluate-commands -draft -itersel %=
         # preserve previous line indent