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jj/cli/src/diff_util.rs

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// Copyright 2020-2022 The Jujutsu Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::borrow::Borrow;
use std::cmp::max;
use std::io;
use std::iter;
use std::mem;
use std::ops::Range;
use std::path::Path;
use std::path::PathBuf;
use bstr::BStr;
use bstr::BString;
use futures::executor::block_on_stream;
use futures::stream::BoxStream;
use futures::StreamExt as _;
use futures::TryStreamExt as _;
use itertools::Itertools as _;
use jj_lib::backend::BackendError;
use jj_lib::backend::BackendResult;
use jj_lib::backend::CommitId;
use jj_lib::backend::CopyRecord;
use jj_lib::backend::TreeValue;
use jj_lib::commit::Commit;
use jj_lib::config::ConfigGetError;
use jj_lib::config::ConfigGetResultExt as _;
use jj_lib::conflicts::materialize_merge_result_to_bytes;
use jj_lib::conflicts::materialized_diff_stream;
use jj_lib::conflicts::ConflictMarkerStyle;
use jj_lib::conflicts::MaterializedFileValue;
use jj_lib::conflicts::MaterializedTreeDiffEntry;
use jj_lib::conflicts::MaterializedTreeValue;
use jj_lib::copies::CopiesTreeDiffEntry;
use jj_lib::copies::CopiesTreeDiffEntryPath;
use jj_lib::copies::CopyOperation;
use jj_lib::copies::CopyRecords;
use jj_lib::diff::find_line_ranges;
use jj_lib::diff::CompareBytesExactly;
use jj_lib::diff::CompareBytesIgnoreAllWhitespace;
use jj_lib::diff::CompareBytesIgnoreWhitespaceAmount;
use jj_lib::diff::Diff;
use jj_lib::diff::DiffHunk;
use jj_lib::diff::DiffHunkKind;
use jj_lib::files::DiffLineHunkSide;
use jj_lib::files::DiffLineIterator;
use jj_lib::files::DiffLineNumber;
use jj_lib::matchers::Matcher;
use jj_lib::merge::MergedTreeValue;
use jj_lib::merged_tree::MergedTree;
use jj_lib::object_id::ObjectId as _;
use jj_lib::repo::Repo;
use jj_lib::repo_path::InvalidRepoPathError;
use jj_lib::repo_path::RepoPath;
use jj_lib::repo_path::RepoPathUiConverter;
use jj_lib::rewrite::rebase_to_dest_parent;
use jj_lib::settings::UserSettings;
use jj_lib::store::Store;
use pollster::FutureExt as _;
use thiserror::Error;
use tracing::instrument;
use unicode_width::UnicodeWidthStr as _;
use crate::config::CommandNameAndArgs;
use crate::formatter::Formatter;
use crate::merge_tools;
use crate::merge_tools::generate_diff;
use crate::merge_tools::invoke_external_diff;
use crate::merge_tools::new_utf8_temp_dir;
use crate::merge_tools::DiffGenerateError;
use crate::merge_tools::DiffToolMode;
use crate::merge_tools::ExternalMergeTool;
use crate::text_util;
use crate::ui::Ui;
#[derive(clap::Args, Clone, Debug)]
#[command(next_help_heading = "Diff Formatting Options")]
#[command(group(clap::ArgGroup::new("short-format").args(&["summary", "stat", "types", "name_only"])))]
#[command(group(clap::ArgGroup::new("long-format").args(&["git", "color_words", "tool"])))]
pub struct DiffFormatArgs {
/// For each path, show only whether it was modified, added, or deleted
#[arg(long, short)]
pub summary: bool,
/// Show a histogram of the changes
#[arg(long)]
pub stat: bool,
/// For each path, show only its type before and after
///
/// The diff is shown as two letters. The first letter indicates the type
/// before and the second letter indicates the type after. '-' indicates
/// that the path was not present, 'F' represents a regular file, `L'
/// represents a symlink, 'C' represents a conflict, and 'G' represents a
/// Git submodule.
#[arg(long)]
pub types: bool,
/// For each path, show only its path
///
/// Typically useful for shell commands like:
/// `jj diff -r @- --name-only | xargs perl -pi -e's/OLD/NEW/g`
#[arg(long)]
pub name_only: bool,
/// Show a Git-format diff
#[arg(long)]
pub git: bool,
/// Show a word-level diff with changes indicated only by color
#[arg(long)]
pub color_words: bool,
/// Generate diff by external command
#[arg(long)]
pub tool: Option<String>,
/// Number of lines of context to show
#[arg(long)]
context: Option<usize>,
// Short flags are set by command to avoid future conflicts.
/// Ignore whitespace when comparing lines.
#[arg(long)] // short = 'w'
ignore_all_space: bool,
/// Ignore changes in amount of whitespace when comparing lines.
#[arg(long, conflicts_with = "ignore_all_space")] // short = 'b'
ignore_space_change: bool,
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum DiffFormat {
// Non-trivial parameters are boxed in order to keep the variants small
Summary,
Stat(Box<DiffStatOptions>),
Types,
NameOnly,
Git(Box<UnifiedDiffOptions>),
ColorWords(Box<ColorWordsDiffOptions>),
Tool(Box<ExternalMergeTool>),
}
impl DiffFormat {
fn is_short(&self) -> bool {
match self {
DiffFormat::Summary
| DiffFormat::Stat(_)
| DiffFormat::Types
| DiffFormat::NameOnly => true,
DiffFormat::Git(_) | DiffFormat::ColorWords(_) | DiffFormat::Tool(_) => false,
}
}
}
/// Returns a list of requested diff formats, which will never be empty.
pub fn diff_formats_for(
settings: &UserSettings,
args: &DiffFormatArgs,
) -> Result<Vec<DiffFormat>, ConfigGetError> {
let formats = diff_formats_from_args(settings, args)?;
if formats.is_empty() {
Ok(vec![default_diff_format(settings, args)?])
} else {
Ok(formats)
}
}
/// Returns a list of requested diff formats for log-like commands, which may be
/// empty.
pub fn diff_formats_for_log(
settings: &UserSettings,
args: &DiffFormatArgs,
patch: bool,
) -> Result<Vec<DiffFormat>, ConfigGetError> {
let mut formats = diff_formats_from_args(settings, args)?;
// --patch implies default if no "long" format is specified
if patch && formats.iter().all(DiffFormat::is_short) {
// TODO: maybe better to error out if the configured default isn't a
// "long" format?
formats.push(default_diff_format(settings, args)?);
formats.dedup();
}
Ok(formats)
}
fn diff_formats_from_args(
settings: &UserSettings,
args: &DiffFormatArgs,
) -> Result<Vec<DiffFormat>, ConfigGetError> {
let mut formats = Vec::new();
// "short" format first:
if args.summary {
formats.push(DiffFormat::Summary);
}
if args.stat {
let mut options = DiffStatOptions::default();
options.merge_args(args);
formats.push(DiffFormat::Stat(Box::new(options)));
}
if args.types {
formats.push(DiffFormat::Types);
}
if args.name_only {
formats.push(DiffFormat::NameOnly);
}
// "long" format follows:
if args.git {
let mut options = UnifiedDiffOptions::from_settings(settings)?;
options.merge_args(args);
formats.push(DiffFormat::Git(Box::new(options)));
}
if args.color_words {
let mut options = ColorWordsDiffOptions::from_settings(settings)?;
options.merge_args(args);
formats.push(DiffFormat::ColorWords(Box::new(options)));
}
if let Some(name) = &args.tool {
let tool = merge_tools::get_external_tool_config(settings, name)?
.unwrap_or_else(|| ExternalMergeTool::with_program(name));
formats.push(DiffFormat::Tool(Box::new(tool)));
}
Ok(formats)
}
fn default_diff_format(
settings: &UserSettings,
args: &DiffFormatArgs,
) -> Result<DiffFormat, ConfigGetError> {
if let Some(args) = settings.get("ui.diff.tool").optional()? {
// External "tool" overrides the internal "format" option.
let tool = if let CommandNameAndArgs::String(name) = &args {
merge_tools::get_external_tool_config(settings, name)?
} else {
None
}
.unwrap_or_else(|| ExternalMergeTool::with_diff_args(&args));
return Ok(DiffFormat::Tool(Box::new(tool)));
}
match settings.get_string("ui.diff.format")?.as_ref() {
"summary" => Ok(DiffFormat::Summary),
"stat" => {
let mut options = DiffStatOptions::default();
options.merge_args(args);
Ok(DiffFormat::Stat(Box::new(options)))
}
"types" => Ok(DiffFormat::Types),
"name-only" => Ok(DiffFormat::NameOnly),
"git" => {
let mut options = UnifiedDiffOptions::from_settings(settings)?;
options.merge_args(args);
Ok(DiffFormat::Git(Box::new(options)))
}
"color-words" => {
let mut options = ColorWordsDiffOptions::from_settings(settings)?;
options.merge_args(args);
Ok(DiffFormat::ColorWords(Box::new(options)))
}
name => Err(ConfigGetError::Type {
name: "ui.diff.format".to_owned(),
error: format!("Invalid diff format: {name}").into(),
source_path: None,
}),
}
}
#[derive(Debug, Error)]
pub enum DiffRenderError {
#[error("Failed to generate diff")]
DiffGenerate(#[source] DiffGenerateError),
#[error(transparent)]
Backend(#[from] BackendError),
#[error("Access denied to {path}")]
AccessDenied {
path: String,
source: Box<dyn std::error::Error + Send + Sync>,
},
#[error(transparent)]
InvalidRepoPath(#[from] InvalidRepoPathError),
#[error(transparent)]
Io(#[from] io::Error),
}
/// Configuration and environment to render textual diff.
pub struct DiffRenderer<'a> {
repo: &'a dyn Repo,
path_converter: &'a RepoPathUiConverter,
conflict_marker_style: ConflictMarkerStyle,
formats: Vec<DiffFormat>,
}
impl<'a> DiffRenderer<'a> {
pub fn new(
repo: &'a dyn Repo,
path_converter: &'a RepoPathUiConverter,
conflict_marker_style: ConflictMarkerStyle,
formats: Vec<DiffFormat>,
) -> Self {
DiffRenderer {
repo,
path_converter,
conflict_marker_style,
formats,
}
}
/// Generates diff between `from_tree` and `to_tree`.
#[expect(clippy::too_many_arguments)]
pub fn show_diff(
&self,
ui: &Ui, // TODO: remove Ui dependency if possible
formatter: &mut dyn Formatter,
from_tree: &MergedTree,
to_tree: &MergedTree,
matcher: &dyn Matcher,
copy_records: &CopyRecords,
width: usize,
) -> Result<(), DiffRenderError> {
formatter.with_label("diff", |formatter| {
self.show_diff_inner(
ui,
formatter,
from_tree,
to_tree,
matcher,
copy_records,
width,
)
})
}
#[expect(clippy::too_many_arguments)]
fn show_diff_inner(
&self,
ui: &Ui,
formatter: &mut dyn Formatter,
from_tree: &MergedTree,
to_tree: &MergedTree,
matcher: &dyn Matcher,
copy_records: &CopyRecords,
width: usize,
) -> Result<(), DiffRenderError> {
let store = self.repo.store();
let path_converter = self.path_converter;
for format in &self.formats {
match format {
DiffFormat::Summary => {
let tree_diff =
from_tree.diff_stream_with_copies(to_tree, matcher, copy_records);
show_diff_summary(formatter, tree_diff, path_converter)?;
}
DiffFormat::Stat(options) => {
let tree_diff =
from_tree.diff_stream_with_copies(to_tree, matcher, copy_records);
let stats =
DiffStats::calculate(store, tree_diff, options, self.conflict_marker_style)
.block_on()?;
show_diff_stats(formatter, &stats, path_converter, width)?;
}
DiffFormat::Types => {
let tree_diff =
from_tree.diff_stream_with_copies(to_tree, matcher, copy_records);
show_types(formatter, tree_diff, path_converter)?;
}
DiffFormat::NameOnly => {
let tree_diff =
from_tree.diff_stream_with_copies(to_tree, matcher, copy_records);
show_names(formatter, tree_diff, path_converter)?;
}
DiffFormat::Git(options) => {
let tree_diff =
from_tree.diff_stream_with_copies(to_tree, matcher, copy_records);
show_git_diff(
formatter,
store,
tree_diff,
options,
self.conflict_marker_style,
)?;
}
DiffFormat::ColorWords(options) => {
let tree_diff =
from_tree.diff_stream_with_copies(to_tree, matcher, copy_records);
show_color_words_diff(
formatter,
store,
tree_diff,
path_converter,
options,
self.conflict_marker_style,
)?;
}
DiffFormat::Tool(tool) => {
match tool.diff_invocation_mode {
DiffToolMode::FileByFile => {
let tree_diff =
from_tree.diff_stream_with_copies(to_tree, matcher, copy_records);
show_file_by_file_diff(
ui,
formatter,
store,
tree_diff,
path_converter,
tool,
self.conflict_marker_style,
)
}
DiffToolMode::Dir => {
let mut writer = formatter.raw()?;
generate_diff(
ui,
writer.as_mut(),
from_tree,
to_tree,
matcher,
tool,
self.conflict_marker_style,
)
.map_err(DiffRenderError::DiffGenerate)
}
}?;
}
}
}
Ok(())
}
/// Generates diff between `from_commits` and `to_commit` based off their
/// parents. The `from_commits` will temporarily be rebased onto the
/// `to_commit` parents to exclude unrelated changes.
pub fn show_inter_diff(
&self,
ui: &Ui,
formatter: &mut dyn Formatter,
from_commits: &[Commit],
to_commit: &Commit,
matcher: &dyn Matcher,
width: usize,
) -> Result<(), DiffRenderError> {
let from_tree = rebase_to_dest_parent(self.repo, from_commits, to_commit)?;
let to_tree = to_commit.tree()?;
let copy_records = CopyRecords::default(); // TODO
self.show_diff(
ui,
formatter,
&from_tree,
&to_tree,
matcher,
&copy_records,
width,
)
}
/// Generates diff of the given `commit` compared to its parents.
pub fn show_patch(
&self,
ui: &Ui,
formatter: &mut dyn Formatter,
commit: &Commit,
matcher: &dyn Matcher,
width: usize,
) -> Result<(), DiffRenderError> {
let from_tree = commit.parent_tree(self.repo)?;
let to_tree = commit.tree()?;
let mut copy_records = CopyRecords::default();
for parent_id in commit.parent_ids() {
let records = get_copy_records(self.repo.store(), parent_id, commit.id(), matcher)?;
copy_records.add_records(records)?;
}
self.show_diff(
ui,
formatter,
&from_tree,
&to_tree,
matcher,
&copy_records,
width,
)
}
}
pub fn get_copy_records<'a>(
store: &'a Store,
root: &CommitId,
head: &CommitId,
matcher: &'a dyn Matcher,
) -> BackendResult<impl Iterator<Item = BackendResult<CopyRecord>> + use<'a>> {
// TODO: teach backend about matching path prefixes?
let stream = store.get_copy_records(None, root, head)?;
// TODO: test record.source as well? should be AND-ed or OR-ed?
Ok(block_on_stream(stream).filter_ok(|record| matcher.matches(&record.target)))
}
#[derive(Clone, Debug, Default, Eq, PartialEq)]
pub struct LineDiffOptions {
/// How equivalence of lines is tested.
pub compare_mode: LineCompareMode,
// TODO: add --ignore-blank-lines, etc. which aren't mutually exclusive.
}
impl LineDiffOptions {
fn merge_args(&mut self, args: &DiffFormatArgs) {
self.compare_mode = if args.ignore_all_space {
LineCompareMode::IgnoreAllSpace
} else if args.ignore_space_change {
LineCompareMode::IgnoreSpaceChange
} else {
LineCompareMode::Exact
};
}
}
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub enum LineCompareMode {
/// Compares lines literally.
#[default]
Exact,
/// Compares lines ignoring any whitespace occurrences.
IgnoreAllSpace,
/// Compares lines ignoring changes in whitespace amount.
IgnoreSpaceChange,
}
fn diff_by_line<'input, T: AsRef<[u8]> + ?Sized + 'input>(
inputs: impl IntoIterator<Item = &'input T>,
options: &LineDiffOptions,
) -> Diff<'input> {
// TODO: If we add --ignore-blank-lines, its tokenizer will have to attach
// blank lines to the preceding range. Maybe it can also be implemented as a
// post-process (similar to refine_changed_regions()) that expands unchanged
// regions across blank lines.
match options.compare_mode {
LineCompareMode::Exact => {
Diff::for_tokenizer(inputs, find_line_ranges, CompareBytesExactly)
}
LineCompareMode::IgnoreAllSpace => {
Diff::for_tokenizer(inputs, find_line_ranges, CompareBytesIgnoreAllWhitespace)
}
LineCompareMode::IgnoreSpaceChange => {
Diff::for_tokenizer(inputs, find_line_ranges, CompareBytesIgnoreWhitespaceAmount)
}
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct ColorWordsDiffOptions {
/// Number of context lines to show.
pub context: usize,
/// How lines are tokenized and compared.
pub line_diff: LineDiffOptions,
/// Maximum number of removed/added word alternation to inline.
pub max_inline_alternation: Option<usize>,
}
impl ColorWordsDiffOptions {
pub fn from_settings(settings: &UserSettings) -> Result<Self, ConfigGetError> {
let max_inline_alternation = {
let name = "diff.color-words.max-inline-alternation";
match settings.get_int(name)? {
-1 => None, // unlimited
n => Some(usize::try_from(n).map_err(|err| ConfigGetError::Type {
name: name.to_owned(),
error: err.into(),
source_path: None,
})?),
}
};
Ok(ColorWordsDiffOptions {
context: settings.get("diff.color-words.context")?,
line_diff: LineDiffOptions::default(),
max_inline_alternation,
})
}
fn merge_args(&mut self, args: &DiffFormatArgs) {
if let Some(context) = args.context {
self.context = context;
}
self.line_diff.merge_args(args);
}
}
fn show_color_words_diff_hunks(
formatter: &mut dyn Formatter,
contents: [&BStr; 2],
options: &ColorWordsDiffOptions,
) -> io::Result<()> {
let line_diff = diff_by_line(contents, &options.line_diff);
let mut line_number = DiffLineNumber { left: 1, right: 1 };
// Matching entries shouldn't appear consecutively in diff of two inputs.
// However, if the inputs have conflicts, there may be a hunk that can be
// resolved, resulting [matching, resolved, matching] sequence.
let mut contexts = Vec::new();
let mut emitted = false;
for hunk in line_diff.hunks() {
let hunk_contents: [&BStr; 2] = hunk.contents[..].try_into().unwrap();
match hunk.kind {
DiffHunkKind::Matching => contexts.push(hunk_contents),
DiffHunkKind::Different => {
let num_after = if emitted { options.context } else { 0 };
line_number = show_color_words_context_lines(
formatter,
&contexts,
line_number,
options,
num_after,
options.context,
)?;
contexts.clear();
emitted = true;
line_number =
show_color_words_diff_lines(formatter, hunk_contents, line_number, options)?;
}
}
}
if emitted {
show_color_words_context_lines(
formatter,
&contexts,
line_number,
options,
options.context,
0,
)?;
}
Ok(())
}
/// Prints `num_after` lines, ellipsis, and `num_before` lines.
fn show_color_words_context_lines(
formatter: &mut dyn Formatter,
contexts: &[[&BStr; 2]],
mut line_number: DiffLineNumber,
options: &ColorWordsDiffOptions,
num_after: usize,
num_before: usize,
) -> io::Result<DiffLineNumber> {
const SKIPPED_CONTEXT_LINE: &str = " ...\n";
let extract = |side: usize| -> (Vec<&[u8]>, Vec<&[u8]>, u32) {
let mut lines = contexts
.iter()
.flat_map(|contents| contents[side].split_inclusive(|b| *b == b'\n'))
.fuse();
let after_lines = lines.by_ref().take(num_after).collect();
let before_lines = lines.by_ref().rev().take(num_before + 1).collect();
let num_skipped: u32 = lines.count().try_into().unwrap();
(after_lines, before_lines, num_skipped)
};
let show = |formatter: &mut dyn Formatter,
[left_lines, right_lines]: [&[&[u8]]; 2],
mut line_number: DiffLineNumber| {
if left_lines == right_lines {
for line in left_lines {
show_color_words_line_number(
formatter,
[Some(line_number.left), Some(line_number.right)],
)?;
show_color_words_inline_hunks(
formatter,
&[(DiffLineHunkSide::Both, line.as_ref())],
)?;
line_number.left += 1;
line_number.right += 1;
}
Ok(line_number)
} else {
let left = left_lines.concat();
let right = right_lines.concat();
show_color_words_diff_lines(
formatter,
[&left, &right].map(BStr::new),
line_number,
options,
)
}
};
let (left_after, mut left_before, num_left_skipped) = extract(0);
let (right_after, mut right_before, num_right_skipped) = extract(1);
line_number = show(formatter, [&left_after, &right_after], line_number)?;
if num_left_skipped > 0 || num_right_skipped > 0 {
write!(formatter, "{SKIPPED_CONTEXT_LINE}")?;
line_number.left += num_left_skipped;
line_number.right += num_right_skipped;
if left_before.len() > num_before {
left_before.pop();
line_number.left += 1;
}
if right_before.len() > num_before {
right_before.pop();
line_number.right += 1;
}
}
left_before.reverse();
right_before.reverse();
line_number = show(formatter, [&left_before, &right_before], line_number)?;
Ok(line_number)
}
fn show_color_words_diff_lines(
formatter: &mut dyn Formatter,
contents: [&BStr; 2],
mut line_number: DiffLineNumber,
options: &ColorWordsDiffOptions,
) -> io::Result<DiffLineNumber> {
let word_diff_hunks = Diff::by_word(contents).hunks().collect_vec();
let can_inline = match options.max_inline_alternation {
None => true, // unlimited
Some(0) => false, // no need to count alternation
Some(max_num) => {
let groups = split_diff_hunks_by_matching_newline(&word_diff_hunks);
groups.map(count_diff_alternation).max().unwrap_or(0) <= max_num
}
};
if can_inline {
let mut diff_line_iter =
DiffLineIterator::with_line_number(word_diff_hunks.iter(), line_number);
for diff_line in diff_line_iter.by_ref() {
show_color_words_line_number(
formatter,
[
diff_line
.has_left_content()
.then_some(diff_line.line_number.left),
diff_line
.has_right_content()
.then_some(diff_line.line_number.right),
],
)?;
show_color_words_inline_hunks(formatter, &diff_line.hunks)?;
}
line_number = diff_line_iter.next_line_number();
} else {
let [left_lines, right_lines] = unzip_diff_hunks_to_lines(&word_diff_hunks);
for tokens in &left_lines {
show_color_words_line_number(formatter, [Some(line_number.left), None])?;
show_color_words_single_sided_line(formatter, tokens, "removed")?;
line_number.left += 1;
}
for tokens in &right_lines {
show_color_words_line_number(formatter, [None, Some(line_number.right)])?;
show_color_words_single_sided_line(formatter, tokens, "added")?;
line_number.right += 1;
}
}
Ok(line_number)
}
fn show_color_words_line_number(
formatter: &mut dyn Formatter,
[left_line_number, right_line_number]: [Option<u32>; 2],
) -> io::Result<()> {
if let Some(line_number) = left_line_number {
formatter.with_label("removed", |formatter| {
write!(formatter.labeled("line_number"), "{line_number:>4}")
})?;
write!(formatter, " ")?;
} else {
write!(formatter, " ")?;
}
if let Some(line_number) = right_line_number {
formatter.with_label("added", |formatter| {
write!(formatter.labeled("line_number"), "{line_number:>4}",)
})?;
write!(formatter, ": ")?;
} else {
write!(formatter, " : ")?;
}
Ok(())
}
/// Prints line hunks which may contain tokens originating from both sides.
fn show_color_words_inline_hunks(
formatter: &mut dyn Formatter,
line_hunks: &[(DiffLineHunkSide, &BStr)],
) -> io::Result<()> {
for (side, data) in line_hunks {
let label = match side {
DiffLineHunkSide::Both => None,
DiffLineHunkSide::Left => Some("removed"),
DiffLineHunkSide::Right => Some("added"),
};
if let Some(label) = label {
formatter.with_label(label, |formatter| {
formatter.with_label("token", |formatter| formatter.write_all(data))
})?;
} else {
formatter.write_all(data)?;
}
}
let (_, data) = line_hunks.last().expect("diff line must not be empty");
if !data.ends_with(b"\n") {
writeln!(formatter)?;
};
Ok(())
}
/// Prints left/right-only line tokens with the given label.
fn show_color_words_single_sided_line(
formatter: &mut dyn Formatter,
tokens: &[(DiffTokenType, &[u8])],
label: &str,
) -> io::Result<()> {
formatter.with_label(label, |formatter| show_diff_line_tokens(formatter, tokens))?;
let (_, data) = tokens.last().expect("diff line must not be empty");
if !data.ends_with(b"\n") {
writeln!(formatter)?;
};
Ok(())
}
/// Counts number of diff-side alternation, ignoring matching hunks.
///
/// This function is meant to measure visual complexity of diff hunks. It's easy
/// to read hunks containing some removed or added words, but is getting harder
/// as more removes and adds interleaved.
///
/// For example,
/// - `[matching]` -> 0
/// - `[left]` -> 1
/// - `[left, matching, left]` -> 1
/// - `[matching, left, right, matching, right]` -> 2
/// - `[left, right, matching, right, left]` -> 3
fn count_diff_alternation(diff_hunks: &[DiffHunk]) -> usize {
diff_hunks
.iter()
.filter_map(|hunk| match hunk.kind {
DiffHunkKind::Matching => None,
DiffHunkKind::Different => Some(&hunk.contents),
})
// Map non-empty diff side to index (0: left, 1: right)
.flat_map(|contents| contents.iter().positions(|content| !content.is_empty()))
// Omit e.g. left->(matching->)*left
.dedup()
.count()
}
/// Splits hunks into slices of contiguous changed lines.
fn split_diff_hunks_by_matching_newline<'a, 'b>(
diff_hunks: &'a [DiffHunk<'b>],
) -> impl Iterator<Item = &'a [DiffHunk<'b>]> {
diff_hunks.split_inclusive(|hunk| match hunk.kind {
DiffHunkKind::Matching => hunk.contents.iter().all(|content| content.contains(&b'\n')),
DiffHunkKind::Different => false,
})
}
struct FileContent {
/// false if this file is likely text; true if it is likely binary.
is_binary: bool,
contents: BString,
}
impl FileContent {
fn empty() -> Self {
Self {
is_binary: false,
contents: BString::default(),
}
}
pub(crate) fn is_empty(&self) -> bool {
self.contents.is_empty()
}
}
fn file_content_for_diff(
path: &RepoPath,
file: &mut MaterializedFileValue,
) -> BackendResult<FileContent> {
// If this is a binary file, don't show the full contents.
// Determine whether it's binary by whether the first 8k bytes contain a null
// character; this is the same heuristic used by git as of writing: https://github.com/git/git/blob/eea0e59ffbed6e33d171ace5be13cde9faa41639/xdiff-interface.c#L192-L198
const PEEK_SIZE: usize = 8000;
// TODO: currently we look at the whole file, even though for binary files we
// only need to know the file size. To change that we'd have to extend all
// the data backends to support getting the length.
let contents = BString::new(file.read_all(path)?);
let start = &contents[..PEEK_SIZE.min(contents.len())];
Ok(FileContent {
is_binary: start.contains(&b'\0'),
contents,
})
}
fn diff_content(
path: &RepoPath,
value: MaterializedTreeValue,
conflict_marker_style: ConflictMarkerStyle,
) -> BackendResult<FileContent> {
match value {
MaterializedTreeValue::Absent => Ok(FileContent::empty()),
MaterializedTreeValue::AccessDenied(err) => Ok(FileContent {
is_binary: false,
contents: format!("Access denied: {err}").into(),
}),
MaterializedTreeValue::File(mut file) => file_content_for_diff(path, &mut file),
MaterializedTreeValue::Symlink { id: _, target } => Ok(FileContent {
// Unix file paths can't contain null bytes.
is_binary: false,
contents: target.into(),
}),
MaterializedTreeValue::GitSubmodule(id) => Ok(FileContent {
is_binary: false,
contents: format!("Git submodule checked out at {id}").into(),
}),
// TODO: are we sure this is never binary?
MaterializedTreeValue::FileConflict {
id: _,
contents,
executable: _,
} => Ok(FileContent {
is_binary: false,
contents: materialize_merge_result_to_bytes(&contents, conflict_marker_style),
}),
MaterializedTreeValue::OtherConflict { id } => Ok(FileContent {
is_binary: false,
contents: id.describe().into(),
}),
MaterializedTreeValue::Tree(id) => {
panic!("Unexpected tree with id {id:?} in diff at path {path:?}");
}
}
}
fn basic_diff_file_type(value: &MaterializedTreeValue) -> &'static str {
match value {
MaterializedTreeValue::Absent => {
panic!("absent path in diff");
}
MaterializedTreeValue::AccessDenied(_) => "access denied",
MaterializedTreeValue::File(file) => {
if file.executable {
"executable file"
} else {
"regular file"
}
}
MaterializedTreeValue::Symlink { .. } => "symlink",
MaterializedTreeValue::Tree(_) => "tree",
MaterializedTreeValue::GitSubmodule(_) => "Git submodule",
MaterializedTreeValue::FileConflict { .. }
| MaterializedTreeValue::OtherConflict { .. } => "conflict",
}
}
pub fn show_color_words_diff(
formatter: &mut dyn Formatter,
store: &Store,
tree_diff: BoxStream<CopiesTreeDiffEntry>,
path_converter: &RepoPathUiConverter,
options: &ColorWordsDiffOptions,
conflict_marker_style: ConflictMarkerStyle,
) -> Result<(), DiffRenderError> {
let mut diff_stream = materialized_diff_stream(store, tree_diff);
async {
while let Some(MaterializedTreeDiffEntry { path, values }) = diff_stream.next().await {
let left_path = path.source();
let right_path = path.target();
let left_ui_path = path_converter.format_file_path(left_path);
let right_ui_path = path_converter.format_file_path(right_path);
let (left_value, right_value) = values?;
match (&left_value, &right_value) {
(MaterializedTreeValue::AccessDenied(source), _) => {
write!(
formatter.labeled("access-denied"),
"Access denied to {left_ui_path}:"
)?;
writeln!(formatter, " {source}")?;
continue;
}
(_, MaterializedTreeValue::AccessDenied(source)) => {
write!(
formatter.labeled("access-denied"),
"Access denied to {right_ui_path}:"
)?;
writeln!(formatter, " {source}")?;
continue;
}
_ => {}
}
if left_value.is_absent() {
let description = basic_diff_file_type(&right_value);
writeln!(
formatter.labeled("header"),
"Added {description} {right_ui_path}:"
)?;
let right_content = diff_content(right_path, right_value, conflict_marker_style)?;
if right_content.is_empty() {
writeln!(formatter.labeled("empty"), " (empty)")?;
} else if right_content.is_binary {
writeln!(formatter.labeled("binary"), " (binary)")?;
} else {
show_color_words_diff_hunks(
formatter,
[BStr::new(""), right_content.contents.as_ref()],
options,
)?;
}
} else if right_value.is_present() {
let description = match (&left_value, &right_value) {
(MaterializedTreeValue::File(left), MaterializedTreeValue::File(right)) => {
if left.executable && right.executable {
"Modified executable file".to_string()
} else if left.executable {
"Executable file became non-executable at".to_string()
} else if right.executable {
"Non-executable file became executable at".to_string()
} else {
"Modified regular file".to_string()
}
}
(
MaterializedTreeValue::FileConflict { .. }
| MaterializedTreeValue::OtherConflict { .. },
MaterializedTreeValue::FileConflict { .. }
| MaterializedTreeValue::OtherConflict { .. },
) => "Modified conflict in".to_string(),
(
MaterializedTreeValue::FileConflict { .. }
| MaterializedTreeValue::OtherConflict { .. },
_,
) => "Resolved conflict in".to_string(),
(
_,
MaterializedTreeValue::FileConflict { .. }
| MaterializedTreeValue::OtherConflict { .. },
) => "Created conflict in".to_string(),
(
MaterializedTreeValue::Symlink { .. },
MaterializedTreeValue::Symlink { .. },
) => "Symlink target changed at".to_string(),
(_, _) => {
let left_type = basic_diff_file_type(&left_value);
let right_type = basic_diff_file_type(&right_value);
let (first, rest) = left_type.split_at(1);
format!(
"{}{} became {} at",
first.to_ascii_uppercase(),
rest,
right_type
)
}
};
let left_content = diff_content(left_path, left_value, conflict_marker_style)?;
let right_content = diff_content(right_path, right_value, conflict_marker_style)?;
if left_path == right_path {
writeln!(
formatter.labeled("header"),
"{description} {right_ui_path}:"
)?;
} else {
writeln!(
formatter.labeled("header"),
"{description} {right_ui_path} ({left_ui_path} => {right_ui_path}):"
)?;
}
if left_content.is_binary || right_content.is_binary {
writeln!(formatter.labeled("binary"), " (binary)")?;
} else {
show_color_words_diff_hunks(
formatter,
[&left_content.contents, &right_content.contents].map(BStr::new),
options,
)?;
}
} else {
let description = basic_diff_file_type(&left_value);
writeln!(
formatter.labeled("header"),
"Removed {description} {right_ui_path}:"
)?;
let left_content = diff_content(left_path, left_value, conflict_marker_style)?;
if left_content.is_empty() {
writeln!(formatter.labeled("empty"), " (empty)")?;
} else if left_content.is_binary {
writeln!(formatter.labeled("binary"), " (binary)")?;
} else {
show_color_words_diff_hunks(
formatter,
[left_content.contents.as_ref(), BStr::new("")],
options,
)?;
}
}
}
Ok(())
}
.block_on()
}
pub fn show_file_by_file_diff(
ui: &Ui,
formatter: &mut dyn Formatter,
store: &Store,
tree_diff: BoxStream<CopiesTreeDiffEntry>,
path_converter: &RepoPathUiConverter,
tool: &ExternalMergeTool,
conflict_marker_style: ConflictMarkerStyle,
) -> Result<(), DiffRenderError> {
let create_file = |path: &RepoPath,
wc_dir: &Path,
value: MaterializedTreeValue|
-> Result<PathBuf, DiffRenderError> {
let fs_path = path.to_fs_path(wc_dir)?;
std::fs::create_dir_all(fs_path.parent().unwrap())?;
let content = diff_content(path, value, conflict_marker_style)?;
std::fs::write(&fs_path, content.contents)?;
Ok(fs_path)
};
let temp_dir = new_utf8_temp_dir("jj-diff-")?;
let left_wc_dir = temp_dir.path().join("left");
let right_wc_dir = temp_dir.path().join("right");
let mut diff_stream = materialized_diff_stream(store, tree_diff);
async {
while let Some(MaterializedTreeDiffEntry { path, values }) = diff_stream.next().await {
let (left_value, right_value) = values?;
let left_path = path.source();
let right_path = path.target();
let left_ui_path = path_converter.format_file_path(left_path);
let right_ui_path = path_converter.format_file_path(right_path);
match (&left_value, &right_value) {
(_, MaterializedTreeValue::AccessDenied(source)) => {
write!(
formatter.labeled("access-denied"),
"Access denied to {right_ui_path}:"
)?;
writeln!(formatter, " {source}")?;
continue;
}
(MaterializedTreeValue::AccessDenied(source), _) => {
write!(
formatter.labeled("access-denied"),
"Access denied to {left_ui_path}:"
)?;
writeln!(formatter, " {source}")?;
continue;
}
_ => {}
}
let left_path = create_file(left_path, &left_wc_dir, left_value)?;
let right_path = create_file(right_path, &right_wc_dir, right_value)?;
let mut writer = formatter.raw()?;
invoke_external_diff(
ui,
writer.as_mut(),
tool,
&maplit::hashmap! {
"left" => left_path.to_str().expect("temp_dir should be valid utf-8"),
"right" => right_path.to_str().expect("temp_dir should be valid utf-8"),
},
)
.map_err(DiffRenderError::DiffGenerate)?;
}
Ok::<(), DiffRenderError>(())
}
.block_on()
}
struct GitDiffPart {
/// Octal mode string or `None` if the file is absent.
mode: Option<&'static str>,
hash: String,
content: FileContent,
}
fn git_diff_part(
path: &RepoPath,
value: MaterializedTreeValue,
conflict_marker_style: ConflictMarkerStyle,
) -> Result<GitDiffPart, DiffRenderError> {
const DUMMY_HASH: &str = "0000000000";
let mode;
let mut hash;
let content;
match value {
MaterializedTreeValue::Absent => {
return Ok(GitDiffPart {
mode: None,
hash: DUMMY_HASH.to_owned(),
content: FileContent::empty(),
});
}
MaterializedTreeValue::AccessDenied(err) => {
return Err(DiffRenderError::AccessDenied {
path: path.as_internal_file_string().to_owned(),
source: err,
});
}
MaterializedTreeValue::File(mut file) => {
mode = if file.executable { "100755" } else { "100644" };
hash = file.id.hex();
content = file_content_for_diff(path, &mut file)?;
}
MaterializedTreeValue::Symlink { id, target } => {
mode = "120000";
hash = id.hex();
content = FileContent {
// Unix file paths can't contain null bytes.
is_binary: false,
contents: target.into(),
};
}
MaterializedTreeValue::GitSubmodule(id) => {
// TODO: What should we actually do here?
mode = "040000";
hash = id.hex();
content = FileContent::empty();
}
MaterializedTreeValue::FileConflict {
id: _,
contents,
executable,
} => {
mode = if executable { "100755" } else { "100644" };
hash = DUMMY_HASH.to_owned();
content = FileContent {
is_binary: false, // TODO: are we sure this is never binary?
contents: materialize_merge_result_to_bytes(&contents, conflict_marker_style),
};
}
MaterializedTreeValue::OtherConflict { id } => {
mode = "100644";
hash = DUMMY_HASH.to_owned();
content = FileContent {
is_binary: false,
contents: id.describe().into(),
};
}
MaterializedTreeValue::Tree(_) => {
panic!("Unexpected tree in diff at path {path:?}");
}
}
hash.truncate(10);
Ok(GitDiffPart {
mode: Some(mode),
hash,
content,
})
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct UnifiedDiffOptions {
/// Number of context lines to show.
pub context: usize,
/// How lines are tokenized and compared.
pub line_diff: LineDiffOptions,
}
impl UnifiedDiffOptions {
pub fn from_settings(settings: &UserSettings) -> Result<Self, ConfigGetError> {
Ok(UnifiedDiffOptions {
context: settings.get("diff.git.context")?,
line_diff: LineDiffOptions::default(),
})
}
fn merge_args(&mut self, args: &DiffFormatArgs) {
if let Some(context) = args.context {
self.context = context;
}
self.line_diff.merge_args(args);
}
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
enum DiffLineType {
Context,
Removed,
Added,
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
enum DiffTokenType {
Matching,
Different,
}
type DiffTokenVec<'content> = Vec<(DiffTokenType, &'content [u8])>;
struct UnifiedDiffHunk<'content> {
left_line_range: Range<usize>,
right_line_range: Range<usize>,
lines: Vec<(DiffLineType, DiffTokenVec<'content>)>,
}
impl<'content> UnifiedDiffHunk<'content> {
fn extend_context_lines(&mut self, lines: impl IntoIterator<Item = &'content [u8]>) {
let old_len = self.lines.len();
self.lines.extend(lines.into_iter().map(|line| {
let tokens = vec![(DiffTokenType::Matching, line)];
(DiffLineType::Context, tokens)
}));
self.left_line_range.end += self.lines.len() - old_len;
self.right_line_range.end += self.lines.len() - old_len;
}
fn extend_removed_lines(&mut self, lines: impl IntoIterator<Item = DiffTokenVec<'content>>) {
let old_len = self.lines.len();
self.lines
.extend(lines.into_iter().map(|line| (DiffLineType::Removed, line)));
self.left_line_range.end += self.lines.len() - old_len;
}
fn extend_added_lines(&mut self, lines: impl IntoIterator<Item = DiffTokenVec<'content>>) {
let old_len = self.lines.len();
self.lines
.extend(lines.into_iter().map(|line| (DiffLineType::Added, line)));
self.right_line_range.end += self.lines.len() - old_len;
}
}
fn unified_diff_hunks<'content>(
contents: [&'content BStr; 2],
options: &UnifiedDiffOptions,
) -> Vec<UnifiedDiffHunk<'content>> {
let mut hunks = vec![];
let mut current_hunk = UnifiedDiffHunk {
left_line_range: 0..0,
right_line_range: 0..0,
lines: vec![],
};
let diff = diff_by_line(contents, &options.line_diff);
let mut diff_hunks = diff.hunks().peekable();
while let Some(hunk) = diff_hunks.next() {
match hunk.kind {
DiffHunkKind::Matching => {
// Just use the right (i.e. new) content. We could count the
// number of skipped lines separately, but the number of the
// context lines should match the displayed content.
let [_, right] = hunk.contents[..].try_into().unwrap();
let mut lines = right.split_inclusive(|b| *b == b'\n').fuse();
if !current_hunk.lines.is_empty() {
// The previous hunk line should be either removed/added.
current_hunk.extend_context_lines(lines.by_ref().take(options.context));
}
let before_lines = if diff_hunks.peek().is_some() {
lines.by_ref().rev().take(options.context).collect()
} else {
vec![] // No more hunks
};
let num_skip_lines = lines.count();
if num_skip_lines > 0 {
let left_start = current_hunk.left_line_range.end + num_skip_lines;
let right_start = current_hunk.right_line_range.end + num_skip_lines;
if !current_hunk.lines.is_empty() {
hunks.push(current_hunk);
}
current_hunk = UnifiedDiffHunk {
left_line_range: left_start..left_start,
right_line_range: right_start..right_start,
lines: vec![],
};
}
// The next hunk should be of DiffHunk::Different type if any.
current_hunk.extend_context_lines(before_lines.into_iter().rev());
}
DiffHunkKind::Different => {
let [left_lines, right_lines] =
unzip_diff_hunks_to_lines(Diff::by_word(hunk.contents).hunks());
current_hunk.extend_removed_lines(left_lines);
current_hunk.extend_added_lines(right_lines);
}
}
}
if !current_hunk.lines.is_empty() {
hunks.push(current_hunk);
}
hunks
}
/// Splits `[left, right]` hunk pairs into `[left_lines, right_lines]`.
fn unzip_diff_hunks_to_lines<'content, I>(diff_hunks: I) -> [Vec<DiffTokenVec<'content>>; 2]
where
I: IntoIterator,
I::Item: Borrow<DiffHunk<'content>>,
{
let mut left_lines: Vec<DiffTokenVec<'content>> = vec![];
let mut right_lines: Vec<DiffTokenVec<'content>> = vec![];
let mut left_tokens: DiffTokenVec<'content> = vec![];
let mut right_tokens: DiffTokenVec<'content> = vec![];
for hunk in diff_hunks {
let hunk = hunk.borrow();
match hunk.kind {
DiffHunkKind::Matching => {
// TODO: add support for unmatched contexts
debug_assert!(hunk.contents.iter().all_equal());
for token in hunk.contents[0].split_inclusive(|b| *b == b'\n') {
left_tokens.push((DiffTokenType::Matching, token));
right_tokens.push((DiffTokenType::Matching, token));
if token.ends_with(b"\n") {
left_lines.push(mem::take(&mut left_tokens));
right_lines.push(mem::take(&mut right_tokens));
}
}
}
DiffHunkKind::Different => {
let [left, right] = hunk.contents[..]
.try_into()
.expect("hunk should have exactly two inputs");
for token in left.split_inclusive(|b| *b == b'\n') {
left_tokens.push((DiffTokenType::Different, token));
if token.ends_with(b"\n") {
left_lines.push(mem::take(&mut left_tokens));
}
}
for token in right.split_inclusive(|b| *b == b'\n') {
right_tokens.push((DiffTokenType::Different, token));
if token.ends_with(b"\n") {
right_lines.push(mem::take(&mut right_tokens));
}
}
}
}
}
if !left_tokens.is_empty() {
left_lines.push(left_tokens);
}
if !right_tokens.is_empty() {
right_lines.push(right_tokens);
}
[left_lines, right_lines]
}
fn show_unified_diff_hunks(
formatter: &mut dyn Formatter,
contents: [&BStr; 2],
options: &UnifiedDiffOptions,
) -> io::Result<()> {
// "If the chunk size is 0, the first number is one lower than one would
// expect." - https://www.artima.com/weblogs/viewpost.jsp?thread=164293
//
// The POSIX spec also states that "the ending line number of an empty range
// shall be the number of the preceding line, or 0 if the range is at the
// start of the file."
// - https://pubs.opengroup.org/onlinepubs/9799919799/utilities/diff.html
fn to_line_number(range: Range<usize>) -> usize {
if range.is_empty() {
range.start
} else {
range.start + 1
}
}
for hunk in unified_diff_hunks(contents, options) {
writeln!(
formatter.labeled("hunk_header"),
"@@ -{},{} +{},{} @@",
to_line_number(hunk.left_line_range.clone()),
hunk.left_line_range.len(),
to_line_number(hunk.right_line_range.clone()),
hunk.right_line_range.len()
)?;
for (line_type, tokens) in &hunk.lines {
let (label, sigil) = match line_type {
DiffLineType::Context => ("context", " "),
DiffLineType::Removed => ("removed", "-"),
DiffLineType::Added => ("added", "+"),
};
formatter.with_label(label, |formatter| {
write!(formatter, "{sigil}")?;
show_diff_line_tokens(formatter, tokens)
})?;
let (_, content) = tokens.last().expect("hunk line must not be empty");
if !content.ends_with(b"\n") {
write!(formatter, "\n\\ No newline at end of file\n")?;
}
}
}
Ok(())
}
fn show_diff_line_tokens(
formatter: &mut dyn Formatter,
tokens: &[(DiffTokenType, &[u8])],
) -> io::Result<()> {
for (token_type, content) in tokens {
match token_type {
DiffTokenType::Matching => formatter.write_all(content)?,
DiffTokenType::Different => {
formatter.with_label("token", |formatter| formatter.write_all(content))?;
}
}
}
Ok(())
}
pub fn show_git_diff(
formatter: &mut dyn Formatter,
store: &Store,
tree_diff: BoxStream<CopiesTreeDiffEntry>,
options: &UnifiedDiffOptions,
conflict_marker_style: ConflictMarkerStyle,
) -> Result<(), DiffRenderError> {
let mut diff_stream = materialized_diff_stream(store, tree_diff);
async {
while let Some(MaterializedTreeDiffEntry { path, values }) = diff_stream.next().await {
let left_path = path.source();
let right_path = path.target();
let left_path_string = left_path.as_internal_file_string();
let right_path_string = right_path.as_internal_file_string();
let (left_value, right_value) = values?;
let left_part = git_diff_part(left_path, left_value, conflict_marker_style)?;
let right_part = git_diff_part(right_path, right_value, conflict_marker_style)?;
formatter.with_label("file_header", |formatter| {
writeln!(
formatter,
"diff --git a/{left_path_string} b/{right_path_string}"
)?;
let left_hash = &left_part.hash;
let right_hash = &right_part.hash;
match (left_part.mode, right_part.mode) {
(None, Some(right_mode)) => {
writeln!(formatter, "new file mode {right_mode}")?;
writeln!(formatter, "index {left_hash}..{right_hash}")?;
}
(Some(left_mode), None) => {
writeln!(formatter, "deleted file mode {left_mode}")?;
writeln!(formatter, "index {left_hash}..{right_hash}")?;
}
(Some(left_mode), Some(right_mode)) => {
if let Some(op) = path.copy_operation() {
let operation = match op {
CopyOperation::Copy => "copy",
CopyOperation::Rename => "rename",
};
// TODO: include similarity index?
writeln!(formatter, "{operation} from {left_path_string}")?;
writeln!(formatter, "{operation} to {right_path_string}")?;
}
if left_mode != right_mode {
writeln!(formatter, "old mode {left_mode}")?;
writeln!(formatter, "new mode {right_mode}")?;
if left_hash != right_hash {
writeln!(formatter, "index {left_hash}..{right_hash}")?;
}
} else if left_hash != right_hash {
writeln!(formatter, "index {left_hash}..{right_hash} {left_mode}")?;
}
}
(None, None) => panic!("either left or right part should be present"),
}
Ok::<(), DiffRenderError>(())
})?;
if left_part.content.contents == right_part.content.contents {
continue; // no content hunks
}
let left_path = match left_part.mode {
Some(_) => format!("a/{left_path_string}"),
None => "/dev/null".to_owned(),
};
let right_path = match right_part.mode {
Some(_) => format!("b/{right_path_string}"),
None => "/dev/null".to_owned(),
};
if left_part.content.is_binary || right_part.content.is_binary {
// TODO: add option to emit Git binary diff
writeln!(
formatter,
"Binary files {left_path} and {right_path} differ"
)?;
} else {
formatter.with_label("file_header", |formatter| {
writeln!(formatter, "--- {left_path}")?;
writeln!(formatter, "+++ {right_path}")?;
io::Result::Ok(())
})?;
show_unified_diff_hunks(
formatter,
[&left_part.content.contents, &right_part.content.contents].map(BStr::new),
options,
)?;
}
}
Ok(())
}
.block_on()
}
#[instrument(skip_all)]
pub fn show_diff_summary(
formatter: &mut dyn Formatter,
mut tree_diff: BoxStream<CopiesTreeDiffEntry>,
path_converter: &RepoPathUiConverter,
) -> Result<(), DiffRenderError> {
async {
while let Some(CopiesTreeDiffEntry { path, values }) = tree_diff.next().await {
let (before, after) = values?;
let (label, sigil) = diff_status_label_and_char(&path, &before, &after);
let path = if path.copy_operation().is_some() {
path_converter.format_copied_path(path.source(), path.target())
} else {
path_converter.format_file_path(path.target())
};
writeln!(formatter.labeled(label), "{sigil} {path}")?;
}
Ok(())
}
.block_on()
}
pub fn diff_status_label_and_char(
path: &CopiesTreeDiffEntryPath,
before: &MergedTreeValue,
after: &MergedTreeValue,
) -> (&'static str, char) {
if let Some(op) = path.copy_operation() {
match op {
CopyOperation::Copy => ("copied", 'C'),
CopyOperation::Rename => ("renamed", 'R'),
}
} else {
match (before.is_present(), after.is_present()) {
(true, true) => ("modified", 'M'),
(false, true) => ("added", 'A'),
(true, false) => ("removed", 'D'),
(false, false) => panic!("values pair must differ"),
}
}
}
#[derive(Clone, Debug, Default, Eq, PartialEq)]
pub struct DiffStatOptions {
/// How lines are tokenized and compared.
pub line_diff: LineDiffOptions,
}
impl DiffStatOptions {
fn merge_args(&mut self, args: &DiffFormatArgs) {
self.line_diff.merge_args(args);
}
}
#[derive(Clone, Debug)]
pub struct DiffStats {
entries: Vec<DiffStatEntry>,
}
impl DiffStats {
/// Calculates stats of changed lines per file.
pub async fn calculate(
store: &Store,
tree_diff: BoxStream<'_, CopiesTreeDiffEntry>,
options: &DiffStatOptions,
conflict_marker_style: ConflictMarkerStyle,
) -> BackendResult<Self> {
let entries = materialized_diff_stream(store, tree_diff)
.map(|MaterializedTreeDiffEntry { path, values }| {
let (left, right) = values?;
let left_content = diff_content(path.source(), left, conflict_marker_style)?;
let right_content = diff_content(path.target(), right, conflict_marker_style)?;
let stat = get_diff_stat_entry(
path,
[&left_content.contents, &right_content.contents].map(BStr::new),
options,
);
BackendResult::Ok(stat)
})
.try_collect()
.await?;
Ok(DiffStats { entries })
}
/// List of stats per file.
pub fn entries(&self) -> &[DiffStatEntry] {
&self.entries
}
/// Total number of insertions.
pub fn count_total_added(&self) -> usize {
self.entries.iter().map(|stat| stat.added).sum()
}
/// Total number of deletions.
pub fn count_total_removed(&self) -> usize {
self.entries.iter().map(|stat| stat.removed).sum()
}
}
#[derive(Clone, Debug)]
pub struct DiffStatEntry {
pub path: CopiesTreeDiffEntryPath,
pub added: usize,
pub removed: usize,
}
fn get_diff_stat_entry(
path: CopiesTreeDiffEntryPath,
contents: [&BStr; 2],
options: &DiffStatOptions,
) -> DiffStatEntry {
// TODO: this matches git's behavior, which is to count the number of newlines
// in the file. but that behavior seems unhelpful; no one really cares how
// many `0x0a` characters are in an image.
let diff = diff_by_line(contents, &options.line_diff);
let mut added = 0;
let mut removed = 0;
for hunk in diff.hunks() {
match hunk.kind {
DiffHunkKind::Matching => {}
DiffHunkKind::Different => {
let [left, right] = hunk.contents[..].try_into().unwrap();
removed += left.split_inclusive(|b| *b == b'\n').count();
added += right.split_inclusive(|b| *b == b'\n').count();
}
}
}
DiffStatEntry {
path,
added,
removed,
}
}
pub fn show_diff_stats(
formatter: &mut dyn Formatter,
stats: &DiffStats,
path_converter: &RepoPathUiConverter,
display_width: usize,
) -> io::Result<()> {
let ui_paths = stats
.entries()
.iter()
.map(|stat| {
if stat.path.copy_operation().is_some() {
path_converter.format_copied_path(stat.path.source(), stat.path.target())
} else {
path_converter.format_file_path(stat.path.target())
}
})
.collect_vec();
let max_path_width = ui_paths.iter().map(|s| s.width()).max().unwrap_or(0);
let max_diffs = stats
.entries()
.iter()
.map(|stat| stat.added + stat.removed)
.max()
.unwrap_or(0);
let number_padding = max_diffs.to_string().len();
// 4 characters padding for the graph
let available_width = display_width.saturating_sub(4 + " | ".len() + number_padding);
// Always give at least a tiny bit of room
let available_width = max(available_width, 5);
let max_path_width = max_path_width.clamp(3, (0.7 * available_width as f64) as usize);
let max_bar_length = available_width.saturating_sub(max_path_width);
let factor = if max_diffs < max_bar_length {
1.0
} else {
max_bar_length as f64 / max_diffs as f64
};
for (stat, ui_path) in iter::zip(stats.entries(), &ui_paths) {
let bar_added = (stat.added as f64 * factor).ceil() as usize;
let bar_removed = (stat.removed as f64 * factor).ceil() as usize;
// replace start of path with ellipsis if the path is too long
let (path, path_width) = text_util::elide_start(ui_path, "...", max_path_width);
let path_pad_width = max_path_width - path_width;
write!(
formatter,
"{path}{:path_pad_width$} | {:>number_padding$}{}",
"", // pad to max_path_width
stat.added + stat.removed,
if bar_added + bar_removed > 0 { " " } else { "" },
)?;
write!(formatter.labeled("added"), "{}", "+".repeat(bar_added))?;
writeln!(formatter.labeled("removed"), "{}", "-".repeat(bar_removed))?;
}
let total_added = stats.count_total_added();
let total_removed = stats.count_total_removed();
let total_files = stats.entries().len();
writeln!(
formatter.labeled("stat-summary"),
"{} file{} changed, {} insertion{}(+), {} deletion{}(-)",
total_files,
if total_files == 1 { "" } else { "s" },
total_added,
if total_added == 1 { "" } else { "s" },
total_removed,
if total_removed == 1 { "" } else { "s" },
)?;
Ok(())
}
pub fn show_types(
formatter: &mut dyn Formatter,
mut tree_diff: BoxStream<CopiesTreeDiffEntry>,
path_converter: &RepoPathUiConverter,
) -> Result<(), DiffRenderError> {
async {
while let Some(CopiesTreeDiffEntry { path, values }) = tree_diff.next().await {
let (before, after) = values?;
writeln!(
formatter.labeled("modified"),
"{}{} {}",
diff_summary_char(&before),
diff_summary_char(&after),
path_converter.format_copied_path(path.source(), path.target())
)?;
}
Ok(())
}
.block_on()
}
fn diff_summary_char(value: &MergedTreeValue) -> char {
match value.as_resolved() {
Some(None) => '-',
Some(Some(TreeValue::File { .. })) => 'F',
Some(Some(TreeValue::Symlink(_))) => 'L',
Some(Some(TreeValue::GitSubmodule(_))) => 'G',
None => 'C',
Some(Some(TreeValue::Tree(_))) | Some(Some(TreeValue::Conflict(_))) => {
panic!("Unexpected {value:?} in diff")
}
}
}
pub fn show_names(
formatter: &mut dyn Formatter,
mut tree_diff: BoxStream<CopiesTreeDiffEntry>,
path_converter: &RepoPathUiConverter,
) -> io::Result<()> {
async {
while let Some(CopiesTreeDiffEntry { path, .. }) = tree_diff.next().await {
writeln!(
formatter,
"{}",
path_converter.format_file_path(path.target())
)?;
}
Ok(())
}
.block_on()
}
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