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781//! Multi-hunk diff-based file patching.
//!
//! Implements a structured patch format similar to unified diffs, allowing
//! targeted edits without full file overwrites. Supports adding, updating
//! (including move/rename), and deleting files with multi-hunk precision.
//!
//! Patch format:
//! ```text
//! *** Begin Patch
//! *** Add File: path/to/new.rs
//! +line1
//! +line2
//! *** Update File: path/to/existing.rs
//! @@ context_before @@
//! unchanged_line
//! -old_line
//! +new_line
//! unchanged_line
//! *** Delete File: path/to/old.rs
//! *** End Patch
//! ```
use std::path::{Path, PathBuf};
use tracing::warn;
/// A single operation in a patch.
#[derive(Debug, Clone, PartialEq)]
pub enum PatchOp {
/// Add a new file with the given content.
AddFile { path: String, content: String },
/// Update an existing file, optionally moving/renaming it.
UpdateFile {
path: String,
move_to: Option<String>,
hunks: Vec<Hunk>,
},
/// Delete an existing file.
DeleteFile { path: String },
}
/// A single hunk within a file update — describes one contiguous change region.
#[derive(Debug, Clone, PartialEq)]
pub struct Hunk {
/// Lines of unchanged context before the change (for anchoring).
pub context_before: Vec<String>,
/// Old lines to be removed (without `-` prefix).
pub old_lines: Vec<String>,
/// New lines to be inserted (without `+` prefix).
pub new_lines: Vec<String>,
/// Lines of unchanged context after the change (for anchoring).
pub context_after: Vec<String>,
}
/// Result of applying a patch.
#[derive(Debug, Default)]
pub struct PatchResult {
/// Number of files added.
pub files_added: u32,
/// Number of files updated.
pub files_updated: u32,
/// Number of files deleted.
pub files_deleted: u32,
/// Number of files moved/renamed.
pub files_moved: u32,
/// Errors encountered during application.
pub errors: Vec<String>,
}
impl PatchResult {
/// Returns true if no errors occurred.
pub fn is_ok(&self) -> bool {
self.errors.is_empty()
}
/// Summary string for tool output.
pub fn summary(&self) -> String {
let mut parts = Vec::new();
if self.files_added > 0 {
parts.push(format!("{} added", self.files_added));
}
if self.files_updated > 0 {
parts.push(format!("{} updated", self.files_updated));
}
if self.files_deleted > 0 {
parts.push(format!("{} deleted", self.files_deleted));
}
if self.files_moved > 0 {
parts.push(format!("{} moved", self.files_moved));
}
if !self.errors.is_empty() {
parts.push(format!("{} errors", self.errors.len()));
}
if parts.is_empty() {
"No changes applied".to_string()
} else {
parts.join(", ")
}
}
}
/// Parse a patch string into a list of `PatchOp`s.
///
/// Expects the format delimited by `*** Begin Patch` and `*** End Patch`.
/// Within that block, each file operation starts with `*** Add File:`,
/// `*** Update File:`, or `*** Delete File:`.
pub fn parse_patch(input: &str) -> Result<Vec<PatchOp>, String> {
let lines: Vec<&str> = input.lines().collect();
let mut ops = Vec::new();
// Find begin/end markers
let begin = lines
.iter()
.position(|l| l.trim() == "*** Begin Patch")
.ok_or("Missing '*** Begin Patch' marker")?;
let end = lines
.iter()
.rposition(|l| l.trim() == "*** End Patch")
.ok_or("Missing '*** End Patch' marker")?;
if end <= begin {
return Err("'*** End Patch' must come after '*** Begin Patch'".to_string());
}
let body = &lines[begin + 1..end];
let mut i = 0;
while i < body.len() {
let line = body[i].trim();
if line.starts_with("*** Add File:") {
let path = line
.strip_prefix("*** Add File:")
.unwrap()
.trim()
.to_string();
if path.is_empty() {
return Err("Empty path in '*** Add File:'".to_string());
}
i += 1;
// Collect content lines (prefixed with +)
let mut content_lines = Vec::new();
while i < body.len() && !body[i].trim().starts_with("***") {
let l = body[i];
if let Some(stripped) = l.strip_prefix('+') {
content_lines.push(stripped.to_string());
} else if !l.trim().is_empty() {
return Err(format!(
"Expected '+' prefix in Add File content, got: {}",
l
));
}
i += 1;
}
ops.push(PatchOp::AddFile {
path,
content: content_lines.join("\n"),
});
} else if line.starts_with("*** Update File:") {
let rest = line.strip_prefix("*** Update File:").unwrap().trim();
// Check for move syntax: "old_path -> new_path"
let (path, move_to) = if let Some((old, new)) = rest.split_once("->") {
(old.trim().to_string(), Some(new.trim().to_string()))
} else {
(rest.to_string(), None)
};
if path.is_empty() {
return Err("Empty path in '*** Update File:'".to_string());
}
i += 1;
// Parse hunks
let mut hunks = Vec::new();
while i < body.len() && !body[i].trim().starts_with("***") {
let l = body[i].trim();
if l.starts_with("@@") {
i += 1;
// Parse hunk body
let mut context_before = Vec::new();
let mut old_lines = Vec::new();
let mut new_lines = Vec::new();
let mut context_after = Vec::new();
let mut in_change = false;
let mut past_change = false;
while i < body.len()
&& !body[i].trim().starts_with("@@")
&& !body[i].trim().starts_with("***")
{
let hl = body[i];
if let Some(stripped) = hl.strip_prefix('-') {
in_change = true;
past_change = false;
old_lines.push(stripped.to_string());
} else if let Some(stripped) = hl.strip_prefix('+') {
in_change = true;
past_change = false;
new_lines.push(stripped.to_string());
} else if let Some(stripped) = hl.strip_prefix(' ') {
if in_change || past_change {
past_change = true;
in_change = false;
context_after.push(stripped.to_string());
} else {
context_before.push(stripped.to_string());
}
} else if hl.trim().is_empty() {
// Blank line counts as context
if in_change || past_change {
past_change = true;
in_change = false;
context_after.push(String::new());
} else {
context_before.push(String::new());
}
} else {
// Unrecognized line, treat as context
if in_change || past_change {
past_change = true;
in_change = false;
context_after.push(hl.to_string());
} else {
context_before.push(hl.to_string());
}
}
i += 1;
}
hunks.push(Hunk {
context_before,
old_lines,
new_lines,
context_after,
});
} else {
i += 1;
}
}
if hunks.is_empty() {
return Err(format!("Update File '{}' has no hunks", path));
}
ops.push(PatchOp::UpdateFile {
path,
move_to,
hunks,
});
} else if line.starts_with("*** Delete File:") {
let path = line
.strip_prefix("*** Delete File:")
.unwrap()
.trim()
.to_string();
if path.is_empty() {
return Err("Empty path in '*** Delete File:'".to_string());
}
i += 1;
ops.push(PatchOp::DeleteFile { path });
} else if line.is_empty() {
i += 1;
} else {
return Err(format!("Unexpected line in patch: {}", line));
}
}
if ops.is_empty() {
return Err("Patch contains no operations".to_string());
}
Ok(ops)
}
/// Resolve a patch path through workspace confinement.
fn resolve_patch_path(raw: &str, workspace_root: &Path) -> Result<PathBuf, String> {
crate::workspace_sandbox::resolve_sandbox_path(raw, workspace_root)
}
/// Apply parsed patch operations against the filesystem.
///
/// All file paths are confined to `workspace_root` via sandbox resolution.
pub async fn apply_patch(ops: &[PatchOp], workspace_root: &Path) -> PatchResult {
let mut result = PatchResult::default();
for op in ops {
match op {
PatchOp::AddFile { path, content } => match resolve_patch_path(path, workspace_root) {
Ok(resolved) => {
if let Some(parent) = resolved.parent() {
if let Err(e) = tokio::fs::create_dir_all(parent).await {
result.errors.push(format!("mkdir {}: {}", path, e));
continue;
}
}
match tokio::fs::write(&resolved, content).await {
Ok(()) => result.files_added += 1,
Err(e) => result.errors.push(format!("write {}: {}", path, e)),
}
}
Err(e) => result.errors.push(format!("{}: {}", path, e)),
},
PatchOp::UpdateFile {
path,
move_to,
hunks,
} => {
let resolved = match resolve_patch_path(path, workspace_root) {
Ok(r) => r,
Err(e) => {
result.errors.push(format!("{}: {}", path, e));
continue;
}
};
// Read existing content
let original = match tokio::fs::read_to_string(&resolved).await {
Ok(c) => c,
Err(e) => {
result.errors.push(format!("read {}: {}", path, e));
continue;
}
};
// Apply hunks sequentially
match apply_hunks(&original, hunks) {
Ok(patched) => {
// Determine target path (move or in-place)
let target = if let Some(new_path) = move_to {
match resolve_patch_path(new_path, workspace_root) {
Ok(t) => {
result.files_moved += 1;
t
}
Err(e) => {
result.errors.push(format!("{}: {}", new_path, e));
continue;
}
}
} else {
resolved.clone()
};
if let Some(parent) = target.parent() {
let _ = tokio::fs::create_dir_all(parent).await;
}
match tokio::fs::write(&target, patched).await {
Ok(()) => {
result.files_updated += 1;
// If moved, delete original
if move_to.is_some() && target != resolved {
let _ = tokio::fs::remove_file(&resolved).await;
}
}
Err(e) => {
result.errors.push(format!("write {}: {}", path, e));
}
}
}
Err(e) => {
result.errors.push(format!("patch {}: {}", path, e));
}
}
}
PatchOp::DeleteFile { path } => match resolve_patch_path(path, workspace_root) {
Ok(resolved) => match tokio::fs::remove_file(&resolved).await {
Ok(()) => result.files_deleted += 1,
Err(e) => {
result.errors.push(format!("delete {}: {}", path, e));
}
},
Err(e) => result.errors.push(format!("{}: {}", path, e)),
},
}
}
result
}
/// Apply a sequence of hunks to file content.
///
/// Each hunk's `context_before` + `old_lines` are searched for in the content.
/// When found, `old_lines` are replaced with `new_lines`. Includes fuzzy
/// whitespace fallback on mismatch.
fn apply_hunks(content: &str, hunks: &[Hunk]) -> Result<String, String> {
let mut lines: Vec<String> = content.lines().map(|l| l.to_string()).collect();
// Track if original file ended with newline
let trailing_newline = content.ends_with('\n');
for (hunk_idx, hunk) in hunks.iter().enumerate() {
let anchor: Vec<&str> = hunk
.context_before
.iter()
.chain(hunk.old_lines.iter())
.map(|s| s.as_str())
.collect();
if anchor.is_empty() && hunk.old_lines.is_empty() {
// Pure insertion hunk — append new lines at end
lines.extend(hunk.new_lines.iter().cloned());
continue;
}
// Find the anchor in the file
let pos = find_anchor(&lines, &anchor)
.or_else(|| find_anchor_fuzzy(&lines, &anchor))
.ok_or_else(|| {
format!(
"Hunk {} failed: could not find context/old lines in file",
hunk_idx + 1
)
})?;
// Replace: remove context_before + old_lines, insert context_before + new_lines
let remove_count = hunk.context_before.len() + hunk.old_lines.len();
let mut replacement: Vec<String> = hunk.context_before.clone();
replacement.extend(hunk.new_lines.iter().cloned());
lines.splice(pos..pos + remove_count, replacement);
}
let mut result = lines.join("\n");
if trailing_newline && !result.ends_with('\n') {
result.push('\n');
}
Ok(result)
}
/// Find an exact match for the anchor lines in the file.
fn find_anchor(file_lines: &[String], anchor: &[&str]) -> Option<usize> {
if anchor.is_empty() {
return Some(file_lines.len());
}
if anchor.len() > file_lines.len() {
return None;
}
'outer: for start in 0..=file_lines.len() - anchor.len() {
for (j, expected) in anchor.iter().enumerate() {
if file_lines[start + j] != *expected {
continue 'outer;
}
}
return Some(start);
}
None
}
/// Fuzzy anchor matching — trims trailing whitespace before comparing.
fn find_anchor_fuzzy(file_lines: &[String], anchor: &[&str]) -> Option<usize> {
if anchor.is_empty() {
return Some(file_lines.len());
}
if anchor.len() > file_lines.len() {
return None;
}
'outer: for start in 0..=file_lines.len() - anchor.len() {
for (j, expected) in anchor.iter().enumerate() {
if file_lines[start + j].trim_end() != expected.trim_end() {
continue 'outer;
}
}
warn!(
"Patch hunk matched with fuzzy whitespace at line {}",
start + 1
);
return Some(start);
}
None
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse_add_file() {
let patch = "\
*** Begin Patch
*** Add File: src/new.rs
+fn main() {
+ println!(\"hello\");
+}
*** End Patch";
let ops = parse_patch(patch).unwrap();
assert_eq!(ops.len(), 1);
match &ops[0] {
PatchOp::AddFile { path, content } => {
assert_eq!(path, "src/new.rs");
assert!(content.contains("fn main()"));
}
_ => panic!("Expected AddFile"),
}
}
#[test]
fn test_parse_update_file() {
let patch = "\
*** Begin Patch
*** Update File: src/lib.rs
@@ hunk 1 @@
fn existing() {
- old_code();
+ new_code();
}
*** End Patch";
let ops = parse_patch(patch).unwrap();
assert_eq!(ops.len(), 1);
match &ops[0] {
PatchOp::UpdateFile {
path,
hunks,
move_to,
} => {
assert_eq!(path, "src/lib.rs");
assert!(move_to.is_none());
assert_eq!(hunks.len(), 1);
assert_eq!(hunks[0].context_before, vec!["fn existing() {"]);
assert_eq!(hunks[0].old_lines, vec![" old_code();"]);
assert_eq!(hunks[0].new_lines, vec![" new_code();"]);
assert_eq!(hunks[0].context_after, vec!["}"]);
}
_ => panic!("Expected UpdateFile"),
}
}
#[test]
fn test_parse_delete_file() {
let patch = "\
*** Begin Patch
*** Delete File: src/old.rs
*** End Patch";
let ops = parse_patch(patch).unwrap();
assert_eq!(ops.len(), 1);
match &ops[0] {
PatchOp::DeleteFile { path } => assert_eq!(path, "src/old.rs"),
_ => panic!("Expected DeleteFile"),
}
}
#[test]
fn test_parse_move_file() {
let patch = "\
*** Begin Patch
*** Update File: old/path.rs -> new/path.rs
@@ hunk @@
keep_this
-remove_this
+add_this
*** End Patch";
let ops = parse_patch(patch).unwrap();
assert_eq!(ops.len(), 1);
match &ops[0] {
PatchOp::UpdateFile { path, move_to, .. } => {
assert_eq!(path, "old/path.rs");
assert_eq!(move_to.as_deref(), Some("new/path.rs"));
}
_ => panic!("Expected UpdateFile"),
}
}
#[test]
fn test_parse_multi_op() {
let patch = "\
*** Begin Patch
*** Add File: a.txt
+hello
*** Delete File: b.txt
*** Update File: c.txt
@@ hunk @@
-old
+new
*** End Patch";
let ops = parse_patch(patch).unwrap();
assert_eq!(ops.len(), 3);
assert!(matches!(&ops[0], PatchOp::AddFile { .. }));
assert!(matches!(&ops[1], PatchOp::DeleteFile { .. }));
assert!(matches!(&ops[2], PatchOp::UpdateFile { .. }));
}
#[test]
fn test_parse_missing_begin() {
let patch = "*** Add File: a.txt\n+hello\n*** End Patch";
assert!(parse_patch(patch).is_err());
}
#[test]
fn test_parse_missing_end() {
let patch = "*** Begin Patch\n*** Add File: a.txt\n+hello";
assert!(parse_patch(patch).is_err());
}
#[test]
fn test_parse_empty_patch() {
let patch = "*** Begin Patch\n*** End Patch";
assert!(parse_patch(patch).is_err());
}
#[test]
fn test_apply_hunks_simple() {
let content = "line1\nline2\nline3\n";
let hunks = vec![Hunk {
context_before: vec!["line1".to_string()],
old_lines: vec!["line2".to_string()],
new_lines: vec!["replaced".to_string()],
context_after: vec![],
}];
let result = apply_hunks(content, &hunks).unwrap();
assert!(result.contains("replaced"));
assert!(!result.contains("line2"));
assert!(result.contains("line1"));
assert!(result.contains("line3"));
}
#[test]
fn test_apply_hunks_multi_hunk() {
let content = "a\nb\nc\nd\ne\n";
let hunks = vec![
Hunk {
context_before: vec!["a".to_string()],
old_lines: vec!["b".to_string()],
new_lines: vec!["B".to_string()],
context_after: vec![],
},
Hunk {
context_before: vec!["c".to_string()],
old_lines: vec!["d".to_string()],
new_lines: vec!["D".to_string(), "D2".to_string()],
context_after: vec![],
},
];
let result = apply_hunks(content, &hunks).unwrap();
assert!(result.contains("B"));
assert!(result.contains("D\nD2"));
assert!(!result.contains("\nb\n"));
assert!(!result.contains("\nd\n"));
}
#[test]
fn test_apply_hunks_context_mismatch() {
let content = "alpha\nbeta\ngamma\n";
let hunks = vec![Hunk {
context_before: vec!["nonexistent".to_string()],
old_lines: vec!["also_nonexistent".to_string()],
new_lines: vec!["new".to_string()],
context_after: vec![],
}];
assert!(apply_hunks(content, &hunks).is_err());
}
#[test]
fn test_apply_hunks_fuzzy_whitespace() {
let content = "line1 \nline2\t\nline3\n";
let hunks = vec![Hunk {
context_before: vec!["line1".to_string()],
old_lines: vec!["line2".to_string()],
new_lines: vec!["replaced".to_string()],
context_after: vec![],
}];
let result = apply_hunks(content, &hunks).unwrap();
assert!(result.contains("replaced"));
}
#[test]
fn test_apply_hunks_preserves_unchanged() {
let content = "header\nkeep1\nkeep2\nold_line\nkeep3\nfooter\n";
let hunks = vec![Hunk {
context_before: vec!["keep2".to_string()],
old_lines: vec!["old_line".to_string()],
new_lines: vec!["new_line".to_string()],
context_after: vec![],
}];
let result = apply_hunks(content, &hunks).unwrap();
assert!(result.contains("header"));
assert!(result.contains("keep1"));
assert!(result.contains("keep2"));
assert!(result.contains("new_line"));
assert!(result.contains("keep3"));
assert!(result.contains("footer"));
assert!(!result.contains("old_line"));
}
#[test]
fn test_find_anchor_exact() {
let lines: Vec<String> = vec!["a", "b", "c", "d"]
.into_iter()
.map(String::from)
.collect();
assert_eq!(find_anchor(&lines, &["b", "c"]), Some(1));
}
#[test]
fn test_find_anchor_not_found() {
let lines: Vec<String> = vec!["a", "b", "c"].into_iter().map(String::from).collect();
assert_eq!(find_anchor(&lines, &["x", "y"]), None);
}
#[test]
fn test_find_anchor_fuzzy() {
let lines: Vec<String> = vec!["a ", "b\t", "c"]
.into_iter()
.map(String::from)
.collect();
assert_eq!(find_anchor_fuzzy(&lines, &["a", "b"]), Some(0));
}
#[tokio::test]
async fn test_apply_patch_integration() {
let dir = std::env::temp_dir().join("openfang_patch_test");
let _ = tokio::fs::remove_dir_all(&dir).await;
tokio::fs::create_dir_all(&dir).await.unwrap();
// Write a file to update
tokio::fs::write(dir.join("existing.txt"), "line1\nline2\nline3\n")
.await
.unwrap();
let ops = vec![
PatchOp::AddFile {
path: "new.txt".to_string(),
content: "hello world".to_string(),
},
PatchOp::UpdateFile {
path: "existing.txt".to_string(),
move_to: None,
hunks: vec![Hunk {
context_before: vec!["line1".to_string()],
old_lines: vec!["line2".to_string()],
new_lines: vec!["replaced".to_string()],
context_after: vec![],
}],
},
];
let result = apply_patch(&ops, &dir).await;
assert!(result.is_ok());
assert_eq!(result.files_added, 1);
assert_eq!(result.files_updated, 1);
// Verify files
let new_content = tokio::fs::read_to_string(dir.join("new.txt"))
.await
.unwrap();
assert_eq!(new_content, "hello world");
let updated = tokio::fs::read_to_string(dir.join("existing.txt"))
.await
.unwrap();
assert!(updated.contains("replaced"));
assert!(!updated.contains("line2"));
let _ = tokio::fs::remove_dir_all(&dir).await;
}
#[tokio::test]
async fn test_apply_patch_delete() {
let dir = std::env::temp_dir().join("openfang_patch_del_test");
let _ = tokio::fs::remove_dir_all(&dir).await;
tokio::fs::create_dir_all(&dir).await.unwrap();
tokio::fs::write(dir.join("doomed.txt"), "goodbye")
.await
.unwrap();
let ops = vec![PatchOp::DeleteFile {
path: "doomed.txt".to_string(),
}];
let result = apply_patch(&ops, &dir).await;
assert!(result.is_ok());
assert_eq!(result.files_deleted, 1);
assert!(!dir.join("doomed.txt").exists());
let _ = tokio::fs::remove_dir_all(&dir).await;
}
}