Add jj diffs --stat option

[ob]

This is a first cut at #2066. It needs a better way of getting the terminal width (hardcoded for now to 120) and maybe some tests... I did a few visual comparisons to git diff and it looks like it works...

jj ❯ COLUMNS=120 git diff --stat 2102de94 e414f3b7
 CHANGELOG.md                       |   4 +++
 cli/src/cli_util.rs                |  34 ++++++-----------------
 cli/src/commands/mod.rs            |  51 +++++++++++++++++-----------------
 cli/src/config-schema.json         |   5 ++++
 cli/src/config/colors.toml         |   1 +
 cli/src/diff_util.rs               |  20 ++++++++++----
 cli/src/merge_tools.rs             |  55 ++++++++++++++++++++-----------------
 cli/tests/test_describe_command.rs |  89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 cli/tests/test_diff_command.rs     |  23 ++++++++++++++++
 docs/config.md                     |   4 +--
 docs/operation-log.md              |   2 +-
 lib/src/conflicts.rs               |  17 ++++--------
 lib/src/default_index_store.rs     | 115 +++++++++++++++++++++++------------------------------------------------------
 lib/src/gitignore.rs               |   7 ++---
 lib/src/local_backend.rs           |   4 +--
 lib/src/repo.rs                    |   7 +++--
 lib/src/working_copy.rs            |  76 ++++++++++++++++++++++++---------------------------
 lib/src/workspace.rs               |   7 ++---
 lib/tests/test_conflicts.rs        |   8 +-----
 19 files changed, 288 insertions(+), 241 deletions(-)

jj ❯ cargo build && ./target/debug/jj diff --stat --from 2102de94 --to e414f3b7
    Finished dev [unoptimized + debuginfo] target(s) in 0.15s
 CHANGELOG.md                       |    4 +++
 cli/src/cli_util.rs                |   34 +++++------------------
 cli/src/commands/mod.rs            |   51 +++++++++++++++++------------------
 cli/src/config/colors.toml         |    1 +
 cli/src/config-schema.json         |    5 +++
 cli/src/diff_util.rs               |   20 ++++++++++----
 cli/src/merge_tools.rs             |   55 +++++++++++++++++++++-----------------
 cli/tests/test_describe_command.rs |   89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 cli/tests/test_diff_command.rs     |   23 ++++++++++++++++
 docs/config.md                     |    4 +-
 docs/operation-log.md              |    2 +-
 lib/src/conflicts.rs               |   17 ++++--------
 lib/src/default_index_store.rs     |  115 +++++++++++++++++++++++--------------------------------------------------------
 lib/src/gitignore.rs               |    7 +---
 lib/src/local_backend.rs           |    4 +--
 lib/src/repo.rs                    |    7 +++--
 lib/src/working_copy.rs            |   76 +++++++++++++++++++++++++---------------------------
 lib/src/workspace.rs               |    7 ++---
 lib/tests/test_conflicts.rs        |    8 +-----
 19 files changed, 288 insertions(+), 241 deletions(-)

Checklist

If applicable:

• I have updated CHANGELOG.md
• I have updated the documentation (README.md, docs/, demos/)
• I have updated the config schema (src/config-schema.json)
• I have added tests to cover my changes

[martinvonz]

Nice! Thank you!

and maybe some tests..

Yes, please :)

Also, please squash the second commit into the first and address comments by amending the commit. See https://github.com/martinvonz/jj/blob/main/docs/contributing.md#code-reviews.

[martinvonz]

Thanks for fixing. Will there be a test or two as well? :) They would probably belong in https://github.com/martinvonz/jj/blob/main/cli/tests/test_diff_command.rs

[ob]

Ah, thanks for the pointer to where the tests are. I'll figure out a way to add some tests...

[ob]

Ok, added some tests (and of course found a new bugs)... if there are other corner cases you can think of let me know and I'll add more tests...

[martinvonz]

Looks good. Thanks again. Feel free to merge once you've resolved the remaining comments.