From db7da314e7f0705c2f0e18b8d42d85e09ea04261 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 17 Jan 2025 21:18:12 -0800
Subject: [PATCH] Work around `cargo vendor` losing syntax_mapping builtins
 directory

---
 CHANGELOG.md            |  2 ++
 build/syntax_mapping.rs | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 941e4e3c..7e30fbf1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@
 
 ## Other
 
+- Work around build failures when building `bat` from vendored sources #3179 (@dtolnay)
+
 ## Syntaxes
 
 ## Themes
diff --git a/build/syntax_mapping.rs b/build/syntax_mapping.rs
index 91a448f6..48468b9a 100644
--- a/build/syntax_mapping.rs
+++ b/build/syntax_mapping.rs
@@ -236,8 +236,14 @@ fn get_def_paths() -> anyhow::Result<Vec<PathBuf>> {
     ];
 
     let mut toml_paths = vec![];
-    for subdir in source_subdirs {
-        let wd = WalkDir::new(Path::new("src/syntax_mapping/builtins").join(subdir));
+    for subdir_name in source_subdirs {
+        let subdir = Path::new("src/syntax_mapping/builtins").join(subdir_name);
+        if !subdir.try_exists()? {
+            // Directory might not exist due to this `cargo vendor` bug:
+            // https://github.com/rust-lang/cargo/issues/15080
+            continue;
+        }
+        let wd = WalkDir::new(subdir);
         let paths = wd
             .into_iter()
             .filter_map_ok(|entry| {