Support custom commit line regex when parsing git output (#558)

Fixes #174

4 files changed, 18 insertions, 1 deletions

diff --git a/src/cli.rs b/src/cli.rs
index d097a878..40629bca 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -357,6 +357,10 @@ pub struct Opt {
     /// (underline), 'ol' (overline), or the combination 'ul ol'.
     pub commit_decoration_style: String,
 
+    /// The regular expression used to identify the commit line when parsing git output.
+    #[structopt(long = "commit-regex", default_value = r"^commit ")]
+    pub commit_regex: String,
+
     #[structopt(long = "file-style", default_value = "blue")]
     /// Style (foreground, background, attributes) for the file section. See STYLES section. The
     /// style 'omit' can be used to remove the file section from the output.
diff --git a/src/config.rs b/src/config.rs
index fbad2e41..8d72fb33 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -23,6 +23,7 @@ pub struct Config {
     pub background_color_extends_to_terminal_width: bool,
     pub commit_style: Style,
     pub color_only: bool,
+    pub commit_regex: Regex,
     pub cwd_relative_to_repo_root: Option<String>,
     pub decorations_width: cli::Width,
     pub diff_stat_align_width: usize,
@@ -136,6 +137,16 @@ impl From<cli::Opt> for Config {
                 .map(|s| s.parse::<f64>().unwrap_or(0.0))
                 .unwrap_or(0.0);
 
+        let commit_regex = Regex::new(&opt.commit_regex).unwrap_or_else(|_| {
+            eprintln!(
+                "Invalid commit-regex: {}. \
+                 The value must be a valid Rust regular expression. \
+                 See https://docs.rs/regex.",
+                opt.commit_regex
+            );
+            process::exit(1);
+        });
+
         let tokenization_regex = Regex::new(&opt.tokenization_regex).unwrap_or_else(|_| {
             eprintln!(
                 "Invalid word-diff-regex: {}. \
@@ -185,6 +196,7 @@ impl From<cli::Opt> for Config {
                 .background_color_extends_to_terminal_width,
             commit_style,
             color_only: opt.color_only,
+            commit_regex,
             cwd_relative_to_repo_root: std::env::var("GIT_PREFIX").ok(),
             decorations_width: opt.computed.decorations_width,
             diff_stat_align_width: opt.diff_stat_align_width,
diff --git a/src/delta.rs b/src/delta.rs
index cfafe3dc..81202bf8 100644
--- a/src/delta.rs
+++ b/src/delta.rs
@@ -115,7 +115,7 @@ impl<'a> StateMachine<'a> {
                 self.source = detect_source(&line);
             }
 
-            let mut handled_line = if line.starts_with("commit ") {
+            let mut handled_line = if self.config.commit_regex.is_match(line) {
                 self.handle_commit_meta_header_line()?
             } else if (self.state == State::CommitMeta || self.state == State::Unknown)
                 && line.starts_with(' ')
diff --git a/src/options/set.rs b/src/options/set.rs
index 6a1a7ad0..b27907e0 100644
--- a/src/options/set.rs
+++ b/src/options/set.rs
@@ -127,6 +127,7 @@ pub fn set_options(
         [
             color_only,
             commit_decoration_style,
+            commit_regex,
             commit_style,
             diff_stat_align_width,
             file_added_label,