From 5ebbc60ccbf1f40501fe89bcf7cf8a7bd1f2c9f9 Mon Sep 17 00:00:00 2001
From: Sekulum Forka <dictatorofturkmenistan@protonmail.com>
Date: Wed, 12 May 2021 15:43:40 +0200
Subject: [PATCH] Builtins: Added the exit builtin

---
 src/fsh.nim | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/fsh.nim b/src/fsh.nim
index 417cd32..d471449 100644
--- a/src/fsh.nim
+++ b/src/fsh.nim
@@ -18,10 +18,11 @@ for k, v in envPairs():
   envVariables[k]=v
 
 # list of builtin commands
-let builtins: array[3, string] = [
+let builtins: array[4, string] = [
 "set",
 "setenv",
 "echo",
+"exit",
 ]
 
 # forward declarations
@@ -214,6 +215,25 @@ proc runBuiltin(builtin: string, args: openArray[string]): string =
       if args[0] == "-n":
         return args[1..^1].join(" ")
       return args.join(" ") & "\p"
+    of "exit":
+      if args.len == 0:
+        quit(0)
+      elif args.len == 1:
+        try:
+          quit(args[0].parseInt)
+        except ValueError:
+          quit(0)
+      else:
+        try:
+          let exitcode=args[0].parseInt
+          if exitcode > 0:
+            stderr.write(args[1..^1].join(" "), "\p")
+          else:
+            stdout.write(args[1..^1].join(" "), "\p")
+          quit(exitcode)
+        except ValueError:
+          stdout.write(args.join(" "), "\p")
+          quit(0)
     else:
       raise newException(Exception, "Fsh: No such builtin implemented")