Add diff view to show commit

This change adds a diff view to the show commit that is similar to the
`git show` command.

1 files changed, 53 insertions, 0 deletions

diff --git a/src/show_commit/delta.rs b/src/show_commit/delta.rs
new file mode 100644
index 0000000..73c3219
--- /dev/null
+++ b/src/show_commit/delta.rs
@@ -0,0 +1,53 @@
+use crate::show_commit::diff_line::DiffLine;
+
+#[derive(Debug, Clone)]
+pub(crate) struct Delta {
+	old_start: u32,
+	old_lines: u32,
+	new_start: u32,
+	new_lines: u32,
+	context: String,
+	lines: Vec<DiffLine>,
+}
+
+impl Delta {
+	pub(super) fn new(header: &str, old_start: u32, new_start: u32, old_lines: u32, new_lines: u32) -> Self {
+		let context = header.split('@').last().unwrap_or("").trim();
+		Self {
+			old_start,
+			old_lines,
+			new_start,
+			new_lines,
+			context: String::from(context),
+			lines: vec![],
+		}
+	}
+
+	pub(crate) fn add_line(&mut self, diff_line: DiffLine) {
+		self.lines.push(diff_line);
+	}
+
+	pub(crate) fn context(&self) -> &str {
+		self.context.as_str()
+	}
+
+	pub(crate) fn lines(&self) -> &Vec<DiffLine> {
+		&self.lines
+	}
+
+	pub(crate) fn old_start(&self) -> u32 {
+		self.old_start
+	}
+
+	pub(crate) fn old_lines(&self) -> u32 {
+		self.old_lines
+	}
+
+	pub(crate) fn new_start(&self) -> u32 {
+		self.new_start
+	}
+
+	pub(crate) fn new_lines(&self) -> u32 {
+		self.new_lines
+	}
+}