Restructure and fix bug in line range module

src/bin/bat/app.rs

@@ -20,7 +20,7 @@ use bat::{
     assets::BAT_THEME_DEFAULT,
     errors::*,
     inputfile::InputFile,
-    line_range::{LineRange, LineRanges},
+    line_range::{HighlightedLineRanges, LineRange, LineRanges},
     style::{OutputComponent, OutputComponents, OutputWrap},
     syntax_mapping::SyntaxMapping,
     Config, PagingMode,
@@ -201,13 +201,14 @@ impl App {
                     }
                 })
                 .unwrap_or_else(|| String::from(BAT_THEME_DEFAULT)),
-            line_ranges: LineRanges::from(
+            line_ranges:
                 self.matches
                     .values_of("line-range")
                     .map(|vs| vs.map(LineRange::from).collect())
                     .transpose()?
-                    .unwrap_or_else(|| vec![]),
-            ),
+                    .map(LineRanges::from)
+                    .unwrap_or_default()
+            ,
             output_components,
             syntax_mapping,
             pager: self.matches.value_of("pager"),
@@ -215,13 +216,14 @@ impl App {
                 Some("always") => true,
                 _ => false,
             },
-            highlight_lines: LineRanges::from(
+            highlighted_lines:
                 self.matches
                     .values_of("highlight-line")
                     .map(|ws| ws.map(LineRange::from).collect())
                     .transpose()?
-                    .unwrap_or_else(|| vec![LineRange { lower: 0, upper: 0 }]),
-            ),
+                    .map(LineRanges::from)
+                    .map(|lr| HighlightedLineRanges(lr))
+                    .unwrap_or_default()
         })
     }
 

src/lib.rs

@@ -68,7 +68,7 @@ impl Default for PagingMode {
 }
 
 use inputfile::InputFile;
-use line_range::LineRanges;
+use line_range::{LineRanges, HighlightedLineRanges};
 use style::{OutputComponents, OutputWrap};
 use syntax_mapping::SyntaxMapping;
 
@@ -123,6 +123,20 @@ pub struct Config<'a> {
     /// Whether or not to use ANSI italics
     pub use_italic_text: bool,
 
-    /// Lines to highlight
-    pub highlight_lines: LineRanges,
+    /// Ranges of lines which should be highlighted with a special background color
+    pub highlighted_lines: HighlightedLineRanges,
+}
+
+#[test]
+fn default_config_should_include_all_lines() {
+    use line_range::RangeCheckResult;
+
+    assert_eq!(Config::default().line_ranges.check(17), RangeCheckResult::InRange);
+}
+
+#[test]
+fn default_config_should_highlight_no_lines() {
+    use line_range::RangeCheckResult;
+
+    assert_ne!(Config::default().highlighted_lines.0.check(17), RangeCheckResult::InRange);
 }

src/line_range.rs

@@ -111,13 +111,15 @@ pub struct LineRanges {
     largest_upper_bound: usize,
 }
 
-impl Default for LineRanges {
-    fn default() -> Self {
-        LineRanges::from(vec![LineRange { lower: 0, upper: 0 }])
-    }
-}
-
 impl LineRanges {
+    pub fn none() -> LineRanges {
+        LineRanges::from(vec![])
+    }
+
+    pub fn all() -> LineRanges {
+        LineRanges::from(vec![LineRange::default()])
+    }
+
     pub fn from(ranges: Vec<LineRange>) -> LineRanges {
         let largest_upper_bound = ranges
             .iter()
@@ -131,7 +133,7 @@ impl LineRanges {
     }
 
     pub fn check(&self, line: usize) -> RangeCheckResult {
-        if self.ranges.is_empty() || self.ranges.iter().any(|r| r.is_inside(line)) {
+        if self.ranges.iter().any(|r| r.is_inside(line)) {
             RangeCheckResult::InRange
         } else if line < self.largest_upper_bound {
             RangeCheckResult::BeforeOrBetweenRanges
@@ -141,6 +143,23 @@ impl LineRanges {
     }
 }
 
+impl Default for LineRanges {
+    fn default() -> Self {
+        Self::all()
+    }
+}
+
+/// Similar to LineRanges, but "empty" by default
+#[derive(Debug, Clone)]
+pub struct HighlightedLineRanges(pub LineRanges);
+
+impl Default for HighlightedLineRanges {
+    fn default() -> Self {
+        HighlightedLineRanges(LineRanges::none())
+    }
+}
+
+
 #[cfg(test)]
 fn ranges(rs: &[&str]) -> LineRanges {
     LineRanges::from(rs.iter().map(|r| LineRange::from(r).unwrap()).collect())
@@ -189,8 +208,15 @@ fn test_ranges_open_high() {
 }
 
 #[test]
-fn test_ranges_empty() {
-    let ranges = ranges(&[]);
+fn test_ranges_all() {
+    let ranges = LineRanges::all();
 
     assert_eq!(RangeCheckResult::InRange, ranges.check(1));
 }
+
+#[test]
+fn test_ranges_none() {
+    let ranges = LineRanges::none();
+
+    assert_ne!(RangeCheckResult::InRange, ranges.check(1));
+}

src/printer.rs

@@ -376,7 +376,7 @@ impl<'a> Printer for InteractivePrinter<'a> {
 
         // Line highlighting
         let highlight_this_line =
-            self.config.highlight_lines.check(line_number) == RangeCheckResult::InRange;
+            self.config.highlighted_lines.0.check(line_number) == RangeCheckResult::InRange;
 
         let background_color = self
             .background_color_highlight