Use special style attribute to control line-number in hunk-header

5 files changed, 23 insertions, 11 deletions

diff --git a/src/cli.rs b/src/cli.rs
index 8fa38c69..cd1555df 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -363,10 +363,13 @@ pub struct Opt {
     #[structopt(long = "hyperlinks-file-link-format", default_value = "file://{path}")]
     pub hyperlinks_file_link_format: String,
 
-    #[structopt(long = "hunk-header-style", default_value = "syntax")]
-    /// Style (foreground, background, attributes) for the hunk-header. See STYLES section. The
-    /// 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.
+    #[structopt(long = "hunk-header-style", default_value = "line-number syntax")]
+    /// Style (foreground, background, attributes) for the hunk-header. See STYLES section. Special
+    /// attributes 'file' and 'line-number' can be used to include the file path, and number of
+    /// first hunk line, in the hunk header. If included in the hunk header, 'file' and
+    /// 'line-number' are styled according to 'file-style' and 'hunk-header-decoration-style'
+    /// respectively. 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 d7f99b20..7331a12c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -33,6 +33,7 @@ pub struct Config {
     pub git_config_entries: HashMap<String, GitConfigEntry>,
     pub hunk_header_style: Style,
     pub hunk_header_style_include_file_path: bool,
+    pub hunk_header_style_include_line_number: bool,
     pub hyperlinks: bool,
     pub hyperlinks_file_link_format: String,
     pub inspect_raw_lines: cli::InspectRawLines,
@@ -167,6 +168,10 @@ impl From<cli::Opt> for Config {
                 .hunk_header_style
                 .split(' ')
                 .any(|s| s == "file"),
+            hunk_header_style_include_line_number: opt
+                .hunk_header_style
+                .split(' ')
+                .any(|s| s == "line-number"),
             hyperlinks: opt.hyperlinks,
             hyperlinks_file_link_format: opt.hyperlinks_file_link_format,
             inspect_raw_lines: opt.computed.inspect_raw_lines,
diff --git a/src/hunk_header.rs b/src/hunk_header.rs
index d5fbef48..2f54dd79 100644
--- a/src/hunk_header.rs
+++ b/src/hunk_header.rs
@@ -96,7 +96,11 @@ fn _write_hunk_header(
         );
         have_hunk_header = true;
     };
-    if !config.line_numbers && !config.hunk_header_style.is_raw && !config.color_only {
+    if !config.line_numbers
+        && config.hunk_header_style_include_line_number
+        && !config.hunk_header_style.is_raw
+        && !config.color_only
+    {
         if have_hunk_header {
             let _ = write!(&mut painter.output_buffer, ":");
         }
diff --git a/src/parse_style.rs b/src/parse_style.rs
index 1fa4fb03..6b7179a9 100644
--- a/src/parse_style.rs
+++ b/src/parse_style.rs
@@ -241,8 +241,8 @@ fn parse_ansi_term_style(
             style.is_strikethrough = true;
         } else if word == "ul" || word == "underline" {
             style.is_underline = true;
-        } else if word == "file" {
-            // Allow: this is meaningful in hunk-header-style.
+        } else if word == "line-number" || word == "file" {
+            // Allow: these are meaningful in hunk-header-style.
         } else if !seen_foreground {
             if word == "syntax" {
                 is_syntax_highlighted = true;
diff --git a/src/tests/test_example_diffs.rs b/src/tests/test_example_diffs.rs
index 286ffe0c..3530b29d 100644
--- a/src/tests/test_example_diffs.rs
+++ b/src/tests/test_example_diffs.rs
@@ -1008,7 +1008,7 @@ src/align.rs
             "--file-style",
             "yellow",
             "--hunk-header-style",
-            "file red",
+            "file line-number red",
             "--hunk-header-decoration-style",
             "box",
         ]);
@@ -1037,7 +1037,7 @@ src/align.rs:71: impl<'a> Alignment<'a> { │
             "--file-style",
             "yellow",
             "--hunk-header-style",
-            "file red",
+            "file line-number red",
             "--hunk-header-decoration-style",
             "box",
         ]);
@@ -1078,7 +1078,7 @@ src/delta.rs:1 │
     fn test_hunk_header_style_colored_input_color_is_stripped_under_normal() {
         let config = integration_test_utils::make_config_from_args(&[
             "--hunk-header-style",
-            "normal",
+            "line-number normal",
             "--hunk-header-decoration-style",
             "omit",
         ]);
@@ -1268,7 +1268,7 @@ impl<'a> Alignment<'a> {
         // otherwise it will confuse assert_line_is_syntax_highlighted.
         let config = integration_test_utils::make_config_from_args(&[
             "--hunk-header-style",
-            "syntax",
+            "line-number syntax",
             "--hunk-header-decoration-style",
             "box",
         ]);