avoid negative repeat_count fixes #1760

src/paint.rs

@@ -261,7 +261,9 @@ impl<'p> Painter<'p> {
                 line.push_str(
                     #[allow(clippy::unnecessary_to_owned)]
                     &fill_style
-                        .paint(" ".repeat(config.available_terminal_width - text_width))
+                        .paint(
+                            " ".repeat(config.available_terminal_width.saturating_sub(text_width)),
+                        )
                         .to_string(),
                 );
             } else if line_is_empty {

src/tests/test_example_diffs.rs

@@ -1994,6 +1994,30 @@ src/align.rs:71: impl<'a> Alignment<'a> { │
             .expect_after_header("#partial\n\nremoved: a");
     }
 
+    #[test]
+    fn test_long_line_underflow() {
+        let output = DeltaTest::with_args(&["--raw",  "--width" , "111", "--zero-style", "syntax #FFFFFF"]).with_input(GIT_DIFF_LONG_LINE).skip_header();
+
+        assert_snapshot!(output, @r###"
+        diff --git a/foobar b/foobar
+        index 185a33cd5b..123f893935 100755
+        --- a/foobar
+        +++ b/foobar
+        @@ -14,6 +14,11 @@ function UNDERFLOW_EXEC() {
+            XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX →
+         }                                                                                                             
+        
+        +
+        +
+        +echo "=== VALIDATE UNDERFLOW"
+        +/usr/local/bin/check_underflow
+        +
+         # this is an example of the underflow error                                                                   
+         echo "=== UNDERFLOW_EXEC"                                                                                     
+         UNDERFLOW_EXEC -i foobar.yaml
+        "###);
+    }
+
     const GIT_DIFF_SINGLE_HUNK: &str = "\
 commit 94907c0f136f46dc46ffae2dc92dca9af7eb7c2e
 Author: Dan Davison <[email protected]>
@@ -2965,4 +2989,30 @@ diff --git a a
 new file mode 100644
 index 0000000..e69de29
 ";
+
+    const GIT_DIFF_LONG_LINE: &str = r#"\
+commit XXXXXXXXXXXXXXXXXXXXXXXXX
+Author: LUCIANO FURTADO <[email protected]>
+Date:   Tue Jun 25 14:07:31 2024 -0500
+
+    Ref: https://github.com/dandavison/delta/issues/1760
+
+diff --git a/foobar b/foobar
+index 185a33cd5b..123f893935 100755
+--- a/foobar
++++ b/foobar
+@@ -14,6 +14,11 @@ function UNDERFLOW_EXEC() {
+    XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
+ }
+
++
++
++echo "=== VALIDATE UNDERFLOW"
++/usr/local/bin/check_underflow
++
+ # this is an example of the underflow error                                                     
+ echo "=== UNDERFLOW_EXEC"
+ UNDERFLOW_EXEC -i foobar.yaml
+
+"#;
 }