From 06b9e603bcfe09266c858439c2c530a1c224888f Mon Sep 17 00:00:00 2001
From: Jake Leahy <jake@leahy.dev>
Date: Wed, 24 Jan 2024 08:35:52 +1100
Subject: [PATCH] Show error when trying to run in folder that doesn't exist
 instead of assertion (#23242)

Closes #23240

Fixes regression caused by #23017
---
 compiler/main.nim     | 3 ++-
 tests/misc/t23240.nim | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 tests/misc/t23240.nim

diff --git a/compiler/main.nim b/compiler/main.nim
index 742530c071..4d472da6f9 100644
--- a/compiler/main.nim
+++ b/compiler/main.nim
@@ -326,7 +326,8 @@ proc mainCommand*(graph: ModuleGraph) =
     # so by default should not end up in $PWD nor in $projectPath.
     var ret = if optUseNimcache in conf.globalOptions: getNimcacheDir(conf)
               else: conf.projectPath
-    doAssert ret.string.isAbsolute # `AbsoluteDir` is not a real guarantee
+    if not ret.string.isAbsolute: # `AbsoluteDir` is not a real guarantee
+      rawMessage(conf, errCannotOpenFile, ret.string & "/")
     if conf.cmd in cmdDocLike + {cmdRst2html, cmdRst2tex, cmdMd2html, cmdMd2tex}:
       ret = ret / htmldocsDir
     conf.outDir = ret
diff --git a/tests/misc/t23240.nim b/tests/misc/t23240.nim
new file mode 100644
index 0000000000..d5edcefe82
--- /dev/null
+++ b/tests/misc/t23240.nim
@@ -0,0 +1,6 @@
+discard """
+  cmd: "nim c foo/bar.nim"
+  action: "reject"
+  errormsg: "cannot open 'foo/'"
+  file: ""
+"""