From 5b28e6c3e17c7d3df1a2d4ecf9d7ca2c4e217b1a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luka=20Ivanovi=C4=87?= <luka@ljudi.org>
Date: Sun, 3 Sep 2023 16:27:21 +0200
Subject: [PATCH] Use XDG for history file

Add an option to first check for default cache directory (usually the one
set with $XDG_CACHE_HOME). If it fails, it uses the file in users home
directory.

More about XDG Base Directory Specification:
- https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
- https://xdgbasedirectoryspecification.com/
---
 command.go | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/command.go b/command.go
index 0dbe5a2..89ea731 100644
--- a/command.go
+++ b/command.go
@@ -171,11 +171,25 @@ func runStdin() {
 
 func runRepl() {
 	var historyFilePath string
-	homeDir, err := os.UserHomeDir()
-	if err == nil {
-		historyFilePath = path.Join(homeDir, ".oak_history")
+	var cacheDir string
+	if rootCacheDir, err := os.UserCacheDir(); err == nil && rootCacheDir != "" {
+		cacheDir = path.Join(rootCacheDir, "oak")
+		_, err = os.Stat(cacheDir)
+		if os.IsNotExist(err) {
+			if err := os.Mkdir(cacheDir, 0755); err != nil {
+				fmt.Println("Could not create cache directory:", cacheDir)
+				fmt.Println(err)
+				cacheDir = ""
+			}
+		}
+	}
+	if cacheDir != "" {
+		historyFilePath = path.Join(cacheDir, ".oak_history")
+	} else {
+		if homeDir, err := os.UserHomeDir(); err == nil {
+			historyFilePath = path.Join(homeDir, ".oak_history")
+		}
 	}
-
 	rl, err := readline.NewEx(&readline.Config{
 		Prompt:      "> ",
 		HistoryFile: historyFilePath,