Add r2md-prepend binary

1 files changed, 50 insertions, 0 deletions

diff --git a/src/bin/r2md-prepend.rs b/src/bin/r2md-prepend.rs
new file mode 100644
index 0000000..2649587
--- /dev/null
+++ b/src/bin/r2md-prepend.rs
@@ -0,0 +1,50 @@
+use std::{ffi::OsString, io};
+
+use clap::Parser;
+use repo2markdown::path_list_editor::prepend_paths;
+
+/// Prepend paths to a null-separated file list from stdin.
+#[derive(Debug, Parser)]
+#[command(version, about, long_about = None)]
+struct Cli {
+    /// Paths to prepend to the input sequence.
+    paths: Vec<OsString>,
+}
+
+fn main() -> io::Result<()> {
+    let cli = Cli::parse();
+    prepend_paths(io::stdin().lock(), io::stdout().lock(), &cli.paths)
+}
+
+#[cfg(test)]
+mod tests {
+    use std::ffi::OsString;
+
+    use clap::Parser;
+
+    use super::Cli;
+
+    #[test]
+    fn accepts_no_paths() {
+        let cli = Cli::try_parse_from(["r2md-prepend"]).unwrap();
+
+        assert_eq!(cli.paths, Vec::<OsString>::new());
+    }
+
+    #[test]
+    fn accepts_one_path() {
+        let cli = Cli::try_parse_from(["r2md-prepend", "README.md"]).unwrap();
+
+        assert_eq!(cli.paths, vec![OsString::from("README.md")]);
+    }
+
+    #[test]
+    fn accepts_multiple_paths() {
+        let cli = Cli::try_parse_from(["r2md-prepend", "README.md", "src/main.rs"]).unwrap();
+
+        assert_eq!(
+            cli.paths,
+            vec![OsString::from("README.md"), OsString::from("src/main.rs")]
+        );
+    }
+}