ripgrep: add --glob-case-insensitive

This flag forces -g/--glob patterns to be treated case-insensitively, as with
--iglob patterns.

Fixes #1293

src/app.rs

@@ -571,6 +571,7 @@ pub fn all_args_and_flags() -> Vec<RGArg> {
     flag_fixed_strings(&mut args);
     flag_follow(&mut args);
     flag_glob(&mut args);
+    flag_glob_case_insensitive(&mut args);
     flag_heading(&mut args);
     flag_hidden(&mut args);
     flag_iglob(&mut args);
@@ -1218,6 +1219,25 @@ it.
     args.push(arg);
 }
 
+fn flag_glob_case_insensitive(args: &mut Vec<RGArg>) {
+    const SHORT: &str = "Process all glob patterns case insensitively.";
+    const LONG: &str = long!("\
+Process glob patterns given with the -g/--glob flag case insensitively. This
+effectively treats --glob as --iglob.
+
+This flag can be disabled with the --no-glob-case-insensitive flag.
+");
+    let arg = RGArg::switch("glob-case-insensitive")
+        .help(SHORT).long_help(LONG)
+        .overrides("no-glob-case-insensitive");
+    args.push(arg);
+
+    let arg = RGArg::switch("no-glob-case-insensitive")
+        .hidden()
+        .overrides("glob-case-insensitive");
+    args.push(arg);
+}
+
 fn flag_heading(args: &mut Vec<RGArg>) {
     const SHORT: &str = "Print matches grouped by each file.";
     const LONG: &str = long!("\

src/args.rs

@@ -1268,6 +1268,10 @@ impl ArgMatches {
     /// Builds the set of glob overrides from the command line flags.
     fn overrides(&self) -> Result<Override> {
         let mut builder = OverrideBuilder::new(env::current_dir()?);
+        // Make all globs case insensitive with --glob-case-insensitive.
+        if self.is_present("glob-case-insensitive") {
+            builder.case_insensitive(true).unwrap();
+        }
         for glob in self.values_of_lossy_vec("glob") {
             builder.add(&glob)?;
         }