Implement hunk-header-style 'file' attribute

Fixes #309

3 files changed, 15 insertions, 1 deletions

diff --git a/src/cli.rs b/src/cli.rs
index 41483a99..22e3de2b 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -365,7 +365,8 @@ pub struct Opt {
 
     #[structopt(long = "hunk-header-style", default_value = "syntax")]
     /// Style (foreground, background, attributes) for the hunk-header. See STYLES section. The
-    /// style 'omit' can be used to remove the hunk header section from the output.
+    /// special attribute 'file' can be used to include the file path in the hunk header. The style
+    /// 'omit' can be used to remove the hunk header section from the output.
     pub hunk_header_style: String,
 
     #[structopt(long = "hunk-header-decoration-style", default_value = "blue box")]
diff --git a/src/config.rs b/src/config.rs
index 28e571d6..6d47ac59 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -32,6 +32,7 @@ pub struct Config {
     pub file_style: Style,
     pub git_config_entries: HashMap<String, GitConfigEntry>,
     pub hunk_header_style: Style,
+    pub hunk_header_style_include_file_path: bool,
     pub hyperlinks: bool,
     pub hyperlinks_file_link_format: String,
     pub inspect_raw_lines: cli::InspectRawLines,
@@ -163,6 +164,10 @@ impl From<cli::Opt> for Config {
             file_style,
             git_config_entries: opt.git_config_entries,
             hunk_header_style,
+            hunk_header_style_include_file_path: opt
+                .hunk_header_style
+                .split(' ')
+                .any(|s| s == "file"),
             hyperlinks: opt.hyperlinks,
             hyperlinks_file_link_format: opt.hyperlinks_file_link_format,
             inspect_raw_lines: opt.computed.inspect_raw_lines,
diff --git a/src/delta.rs b/src/delta.rs
index de9d68e2..e401e269 100644
--- a/src/delta.rs
+++ b/src/delta.rs
@@ -1,4 +1,5 @@
 use std::borrow::Cow;
+use std::fmt::Write as FmtWrite;
 use std::io::BufRead;
 use std::io::Write;
 
@@ -485,6 +486,13 @@ fn handle_hunk_header_line(
             writeln!(painter.writer)?;
         }
         if !line.is_empty() {
+            if config.hunk_header_style_include_file_path {
+                let _ = write!(
+                    &mut painter.output_buffer,
+                    "{}: ",
+                    config.file_style.paint(plus_file)
+                );
+            };
             let lines = vec![(line, State::HunkHeader)];
             let syntax_style_sections = Painter::get_syntax_style_sections_for_lines(
                 &lines,