implement function `error`

1 files changed, 14 insertions, 0 deletions

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)?;