From 6a41b2ac4a2d171917126e56b741b16a184897c7 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Mon, 5 Apr 2021 12:05:32 -0600
Subject: implement function `error`

---
 src/makefile/functions.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/makefile/functions.rs b/src/makefile/functions.rs
index 46caca5..2098334 100644
--- a/src/makefile/functions.rs
+++ b/src/makefile/functions.rs
@@ -113,6 +113,11 @@ pub fn expand_call(
             origin(macros, &args[0])
         }
 
+        "error" => {
+            assert_eq!(args.len(), 1);
+            meta::error(macros, &args[0])
+        }
+
         "shell" => {
             assert_eq!(args.len(), 1);
             shell(macros, &args[0])
@@ -415,6 +420,15 @@ pub fn origin(macros: &MacroSet, variable: &TokenString) -> Result<String> {
     Ok(macros.origin(&variable).to_owned())
 }
 
+mod meta {
+    use super::*;
+
+    pub fn error(macros: &MacroSet, text: &TokenString) -> Result<String> {
+        let text = macros.expand(text)?;
+        bail!("{}", text);
+    }
+}
+
 pub fn shell(macros: &MacroSet, command: &TokenString) -> Result<String> {
     // TODO bring this in from command_line
     let command = macros.expand(command)?;
-- 
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