From b5c3132edbee5e80292c7e3a976bd1bd73d0c420 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Mon, 5 Apr 2021 11:48:45 -0600
Subject: implement function `dir`

---
 src/makefile/functions.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/makefile/functions.rs b/src/makefile/functions.rs
index 6815ac4..4ead48f 100644
--- a/src/makefile/functions.rs
+++ b/src/makefile/functions.rs
@@ -37,6 +37,10 @@ pub fn expand_call(
             text::sort(macros, &args[0])
         }
 
+        "dir" => {
+            assert_eq!(args.len(), 1);
+            file_name::dir(macros, &args[0])
+        }
         "notdir" => {
             assert_eq!(args.len(), 1);
             file_name::notdir(macros, &args[0])
@@ -190,6 +194,20 @@ mod file_name {
 
     use super::*;
 
+    pub fn dir(macros: &MacroSet, words: &TokenString) -> Result<String> {
+        let words = macros.expand(words)?;
+        let words = words
+            .split_whitespace()
+            .map(|word| {
+                Path::new(word)
+                    .parent()
+                    .and_then(Path::to_str)
+                    .unwrap_or("./")
+            })
+            .collect::<Vec<_>>();
+        Ok(words.join(" "))
+    }
+
     pub fn notdir(macros: &MacroSet, words: &TokenString) -> Result<String> {
         let words = macros.expand(words)?;
         let words = words
-- 
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