1 files changed, 106 insertions, 0 deletions
diff --git a/pkgs/by-name/ro/rollup/src/main.rs b/pkgs/by-name/ro/rollup/src/main.rs
new file mode 100644
index 00000000..8285e702
--- /dev/null
+++ b/pkgs/by-name/ro/rollup/src/main.rs
@@ -0,0 +1,106 @@
+use core::fmt;
+use std::{path::PathBuf, process::Command};
+
+use anyhow::{Context, Result};
+use clap::Parser;
+
+#[derive(Parser)]
+struct Cli {
+    /// The file to pull the patch to rollup from.
+    patch_file: PathBuf,
+}
+
+struct Diff {
+    files: Vec<FileDiff>,
+}
+
+struct FileDiff {
+    from: PathBuf,
+    to: PathBuf,
+    diff: String,
+    index: String,
+}
+
+impl fmt::Display for FileDiff {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        writeln!(
+            f,
+            "diff --git a/{} b/{}",
+            self.from.display(),
+            self.to.display()
+        )?;
+        writeln!(f, "--- a/{}", self.from.display())?;
+        writeln!(f, "+++ b/{}", self.to.display())?;
+        writeln!(f, "index {}", self.index)?;
+        writeln!(f, "{}", self.diff)?;
+
+        Ok(())
+    }
+}
+
+macro_rules! take {
+    ($line:expr, $prefix:literal) => {
+        $line.strip_prefix($prefix).unwrap().trim()
+    };
+}
+
+fn main() -> Result<()> {
+    let args = Cli::parse();
+
+    let data = Command::new("filterdiff")
+        .arg(&args.patch_file)
+        .output()
+        .context("Failed to run `filterdiff` for patch analysis")?;
+
+    let stdout = String::from_utf8(data.stdout).unwrap();
+
+    let mut diff = Diff { files: vec![] };
+    let mut file_diff_from = None;
+    let mut file_diff_to = None;
+    let mut file_diff_diff: Option<String> = None;
+    let mut file_diff_index: Option<String> = None;
+    for (idx, line) in stdout.lines().enumerate() {
+        eprintln!("{}", line);
+
+        if line.starts_with("---") {
+            file_diff_from = Some(PathBuf::from(take!(line, "--- a/")));
+        } else if line.starts_with("+++") {
+            file_diff_to = Some(PathBuf::from(take!(line, "+++ b/")));
+        } else if line.starts_with("index") {
+            file_diff_index = Some(take!(line, "index").to_owned());
+        } else if line.starts_with("diff --git") {
+            if idx != 0 {
+                diff.files.push(FileDiff {
+                    from: file_diff_from.take().unwrap(),
+                    to: file_diff_to.take().unwrap(),
+                    diff: file_diff_diff.take().unwrap(),
+                    index: file_diff_index.take().unwrap(),
+                });
+            }
+        } else {
+            match file_diff_diff.as_mut() {
+                Some(str) => {
+                    str.push_str(line);
+                    str.push('\n');
+                }
+                None => {
+                    let mut base = line.to_owned();
+                    base.push('\n');
+                    file_diff_diff = Some(base);
+                }
+            }
+        }
+    }
+    diff.files.push(FileDiff {
+        from: file_diff_from.unwrap(),
+        to: file_diff_to.unwrap(),
+        diff: file_diff_diff.unwrap(),
+        index: file_diff_index.unwrap(),
+    });
+
+    for file in diff.files {
+        eprintln!("{}", file)
+    }
+
+    Ok(())
+}