feat(blame, diff): add blame support, bump the git-internal version

[muzaffarmhd]

This Pull Request implements the libra blame command to show line-by-line commit attribution for files. The command walks backward through commit history using diff to track which commit last modified each line, with support for line range filtering (-L) and Git-compatible output formatting with timezone-aware timestamps piped through a pager. It bumps the git-internal dependency from version 0.1.0 to 0.2.2, which includes an updated diff implementation. The changes migrate diff operations from a local diff_engine module to the git-internal crate and add comprehensive blame support with line range selection.

Key Changes

• Added new blame command with line-range support and formatted output
• Migrated diff functionality from local implementation to git-internal crate (version 0.2.2)
• Updated tests to use tempfile for better isolation instead of shared test utilities
• Added colorized diff output for terminal display

Notes:

1. In tests/command/log_test.rs The test values for insertions and deletions have changed from (4, 3) to (2, 1) because the previous version used a naive diff that marked ALL old lines as deleted and ALL new lines as inserted, and the tests were correct for previous version, so updated the tests.

2. The current diff implementation doesn't support algorithm option, whilst the option can be provided, it serves no real purpose as of current implementation, if the the git-internal crate can be updated with algorithm support, the same can be added to libra.

[ This is a pre-task and part of r2cn and fixes #64 ]

[Copilot]

Pull request overview

This PR adds a new libra blame command to show line-by-line commit attribution for files with support for line range filtering and Git-compatible formatted output. It also migrates diff functionality from a local diff_engine module to the git-internal crate (version 0.2.2) and refactors tests to use tempfile for better isolation.

Key changes:

• New blame command implementation with line-range support and timezone-aware timestamps
• Migration of diff operations from local implementation to git-internal crate v0.2.2
• Colorized diff output for terminal display
• Test refactoring to use tempfile instead of shared utilities

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/command/blame.rs	New blame command implementation with history walking and line attribution
src/command/diff.rs	Migrated to git-internal Diff API, added colorization, removed algorithm parameter
src/command/push.rs	Updated to use MetaAttached wrapper for Entry objects
src/command/index_pack.rs	Updated pack.decode() signature to accept MetaAttached entries
src/command/log.rs	Updated to use git-internal Diff API
src/command/mod.rs	Added blame module export
src/cli.rs	Added Blame command and routing
src/lib.rs	Removed diff_engine module
src/utils/lfs.rs	Refactored test to use tempfile for better isolation
src/internal/protocol/lfs_client.rs	Refactored test to use tempfile
tests/command/log_test.rs	Updated test expectations and migrated to git-internal Diff API
Cargo.toml	Bumped git-internal from 0.1.0 to 0.2.2
Cargo.lock	Updated dependencies

[Copilot]

Pull request overview

Copilot reviewed 13 out of 14 changed files in this pull request and generated 5 comments.

[muzaffarmhd]

@genedna This Pull Request is ready for review/merge after applying all the suggested changes by copilot and fixing build errors.

[Copilot]

Pull request overview

Copilot reviewed 299 out of 389 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 299 out of 389 changed files in this pull request and generated no new comments.

[231220075]

LGTM.

[benjamin-747]

LGTM