Add case-sensitive glob support to syntax mapping

to allow us to map `BUILD` case sensitively to Python for Skylark

src/syntax_mapping/builtin.rs

@@ -53,8 +53,9 @@ include!(concat!(
 /// A failure to compile is a fatal error.
 ///
 /// Used internally by `Lazy<Option<GlobMatcher>>`'s lazy evaluation closure.
-fn build_matcher_fixed(from: &str) -> GlobMatcher {
-    make_glob_matcher(from).expect("A builtin fixed glob matcher failed to compile")
+fn build_matcher_fixed(from: &str, case_insensitive: bool) -> GlobMatcher {
+    make_glob_matcher(from, case_insensitive)
+        .expect("A builtin fixed glob matcher failed to compile")
 }
 
 /// Join a list of matcher segments to create a glob string, replacing all
@@ -64,7 +65,7 @@ fn build_matcher_fixed(from: &str) -> GlobMatcher {
 /// to compile.
 ///
 /// Used internally by `Lazy<Option<GlobMatcher>>`'s lazy evaluation closure.
-fn build_matcher_dynamic(segs: &[MatcherSegment]) -> Option<GlobMatcher> {
+fn build_matcher_dynamic(segs: &[MatcherSegment], case_insensitive: bool) -> Option<GlobMatcher> {
     // join segments
     let mut buf = String::new();
     for seg in segs {
@@ -77,7 +78,7 @@ fn build_matcher_dynamic(segs: &[MatcherSegment]) -> Option<GlobMatcher> {
         }
     }
     // compile glob matcher
-    let matcher = make_glob_matcher(&buf).ok()?;
+    let matcher = make_glob_matcher(&buf, case_insensitive).ok()?;
     Some(matcher)
 }
 

src/syntax_mapping/builtins/README.md

@@ -20,9 +20,9 @@ syntax mappings defined by all TOML files, and embed them into the binary.
 
 ## File syntax
 
-Each TOML file should contain a single section named `mappings`, with each of
-its keys being a language identifier (first column of `bat -L`; also referred to
-as "target").
+Each TOML file should contain a single section named `mappings` and/or a single
+section named `case_sensitive_mappings`, with each of its keys being a language
+identifier (first column of `bat -L`; also referred to as "target").
 
 The value of each key should be an array of strings, with each item being a glob
 matcher. We will call each of these items a "rule".

src/syntax_mapping/builtins/common/50-bazel.toml

@@ -1,2 +1,2 @@
-[mappings]
+[case_sensitive_mappings]
 "Python" = ["BUILD"]