From 430eefbe550253e3307d1ab04f1015d2e2e19d88 Mon Sep 17 00:00:00 2001
From: levovix0 <xlevovix@gmail.com>
Date: Sat, 4 Dec 2021 23:50:15 +0300
Subject: [PATCH] add: system locale detection

---
 README.md        |  7 +++++++
 localize.nimble  |  2 +-
 src/localize.nim | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index d07b1b7..088a8b1 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,13 @@ echo tr"Hi, {name}"
 }
 ```
 
+## detecting system language
+```nim
+var lang = case systemLocale().lang
+of "ru": Language.ru
+else:    Language.en
+```
+system locale values bases on linux's LANG env variable
 
 ## known issues
 * recompilation without changing code is not updating translations
diff --git a/localize.nimble b/localize.nimble
index e6c5906..8a47466 100644
--- a/localize.nimble
+++ b/localize.nimble
@@ -1,4 +1,4 @@
-version       = "0.1.0"
+version       = "0.2.0"
 author        = "levovix0"
 description   = "Compile time localization for applications"
 license       = "MIT"
diff --git a/src/localize.nim b/src/localize.nim
index 0d05efb..004eb9f 100644
--- a/src/localize.nim
+++ b/src/localize.nim
@@ -50,3 +50,45 @@ template initLocalize*(Language: type, langVar) =
         r{x.file, x.s, x.comment} = newJString f{x.file, x.s, x.comment}.getStr(x.s)
       
       writeFile("translations" / ($lang & ".json"), r.pretty)
+
+
+when defined(windows):
+  const
+    Chinese = 4
+    German = 7
+    English = 9
+    Spanish = 10
+    Japanese = 11
+    French = 12
+    Italian = 16
+    Polish = 21
+    Russian = 25
+  
+  # TODO: seems like this method is deprecated
+  proc GetUserDefaultLangID(): int {.importc, dynlib: "Kernel32.dll".}
+
+  proc systemLocale*: tuple[lang, variant: string] =
+    let lang = GetUserDefaultLangID() and 0x00FF
+    case lang
+    of Chinese: ("zh", "")
+    of German: ("de", "")
+    of English: ("en", "")
+    of Spanish: ("es", "")
+    of Japanese: ("ja", "")
+    of French: ("fr", "")
+    of Italian: ("it", "")
+    of Polish: ("pl", "")
+    of Russian: ("ru", "")
+    else: ("en", "")
+
+else:
+  import os, strutils
+
+  proc systemLocale*: tuple[lang, variant: string] =
+    ## returns system locale
+    ## parses "en_US.UTF-8" as ("en", "us")
+    var lang = getEnv("LANG", "en_US.UTF-8")
+    if lang.endsWith(".UTF-8"):
+      lang = lang[0..^7]
+    let l = lang.split("_")
+    (l[0].toLower, l[1..^1].join("_").toLower)