From 27abec50cbcc3e18b375bca050fc280cf089b55c Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Sat, 3 Apr 2021 18:39:18 -0600
Subject: handle comments better in confusing situations

---
 src/makefile/input.rs | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/src/makefile/input.rs b/src/makefile/input.rs
index 7c699f1..d6f6254 100644
--- a/src/makefile/input.rs
+++ b/src/makefile/input.rs
@@ -265,30 +265,30 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
             return Some((line_number, Ok(line.join(escaped_newline_replacement))));
         }
         while let Some((line_number, line)) = self.lines_iter.next() {
-            let mut line = match line {
+            let line = match line {
                 Ok(x) => x,
                 Err(err) => return Some((line_number, Err(err))),
             };
+            // handle comments
+            lazy_static! {
+                static ref COMMENT: Regex = Regex::new("#.*$").unwrap();
+            }
+            let line = COMMENT.replace(&line, "").into_owned();
 
             // handle escaped newlines
             let mut line_pieces = vec![line];
             while line_pieces.last().map_or(false, |p| p.ends_with('\\')) {
                 line_pieces.last_mut().map(|x| x.pop());
                 if let Some((n, x)) = self.lines_iter.next() {
-                    let x = match x {
+                    let line = match x {
                         Ok(x) => x,
                         Err(err) => return Some((n, Err(err))),
                     };
-                    line_pieces.push(x.trim_start().to_string());
+                    let line = COMMENT.replace(&line, "");
+                    line_pieces.push(line.trim_start().to_string());
                 }
             }
-            line = line_pieces.join(escaped_newline_replacement);
-
-            // handle comments
-            lazy_static! {
-                static ref COMMENT: Regex = Regex::new("#.*$").unwrap();
-            }
-            let line = COMMENT.replace(&line, "").into_owned();
+            let line = line_pieces.join(escaped_newline_replacement);
 
             #[cfg(feature = "full")]
             {
@@ -369,6 +369,7 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
         }) {
             let mut line = x?;
             if !line.is_empty() {
+                assert!(line.starts_with('\t'));
                 line.remove(0);
             }
             if line.is_empty() {
-- 
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