# Delta 0.17.0

- Product: Delta (https://whatsnew.fyi/product/git-delta)
- Vendor: Dan Davison
- Date: 2024-03-16
- Version: 0.17.0
- Original notes: https://github.com/dandavison/delta/releases/tag/0.17.0
- Permalink: https://whatsnew.fyi/product/git-delta/releases/0.17.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Automatically detect whether your terminal has a light/dark background unless you specify with `--light` or `--dark`
- **added** — Parse filename unambiguously using color escape sequences to correctly parse traditional grep output
- **added** — Honor default-language option to set a default language for files without file name suffix
- **added** — Generate completion subcommand
- **added** — Add mellow-barbet theme
- **added** — Add arctic-fox custom theme
- **added** — Add corvus theme
- **added** — Add Catppuccin latte to light syntax themes
- **changed** — Make hunk header code fragment display optional
- **changed** — Replace usage of the `atty` crate with `std::io::IsTerminal` trait
- **changed** — Switch from vte to anstyle-parse for ANSI escape sequence parsing
- **changed** — Upgrade bytelines to latest, without default features
- **changed** — Update git2 dependency
- **changed** — Improve binary file added output
- **fixed** — Fix alignment in blame mode when author name contains unicode accent modifiers
- **fixed** — Fix issue where pager would be set to `more` or `most`
- **fixed** — Fix handling of tabs in grep output
- **fixed** — Fix headers of modified binary files
- **fixed** — Preserve "Binary files" line in color_only mode
- **fixed** — Reset syntax highlighter across grep sections

Thanks to the many contributors! Particular highlights are

Thanks to @bash's work, delta now automatically detects whether your terminal has a light/dark background (unless you specify with `--light` or `--dark`):

* Detect Dark/Light Mode from Terminal by @bash in https://github.com/dandavison/delta/pull/1615

@joshtriplett solved the long-standing problem of correctly parsing traditional grep output, e.g. `git grep`, `grep`, etc. Until now there had been annoying parse ambiguities related to separator characters in file paths. This is particularly valuable for `git grep` since it has interesting features such as `git grep -W` (see https://github.com/dandavison/delta/issues/769)

* Parse filename unambiguously using color escape sequences by @joshtriplett in https://github.com/dandavison/delta/pull/1634

@imbrish fixed two important bugs and added the ability to set a default language (e.g. for executable shell scripts with no file name suffix)
* Honor default-language option by @imbrish in https://github.com/dandavison/delta/pull/1655
* Preserve "Binary files" line in color_only mode by @imbrish in https://github.com/dandavison/delta/pull/1649
* Fix headers of modified binary files by @imbrish in https://github.com/dandavison/delta/pull/1629


##### What's Changed
* Add mellow-barbet theme by @kvrohit in https://github.com/dandavison/delta/pull/1452
* Fix alignment in blame mode when author name contains unicode accent modifiers by @hpwxf in https://github.com/dandavison/delta/pull/1456
* Replace usage of the `atty` crate with `std::io::IsTerminal` trait by @nickelc in https://github.com/dandavison/delta/pull/1465
* Refactor subcommand handling by @dandavison in https://github.com/dandavison/delta/pull/1467
* Bump clap to v4.3.14 and regenerate Cargo.lock by @th1000s in https://github.com/dandavison/delta/pull/1472
* Fix issue where pager would be set to `more` or `most` by @ippsav in https://github.com/dandavison/delta/pull/1494
* Improve binary file added output  by @Sondeyy in https://github.com/dandavison/delta/pull/1502
* Remove the navigation setting from themes. by @Qwerty-133 in https://github.com/dandavison/delta/pull/1503
* Add assertion failure message by @dandavison in https://github.com/dandavison/delta/pull/1508
* Fix handling of tabs in grep output by @dandavison in https://github.com/dandavison/delta/pull/1507
* Support users other than git in github SSH URLs by @dandavison in https://github.com/dandavison/delta/pull/1509
* Update installation instructions for openSUSE by @sorairolake in https://github.com/dandavison/delta/pull/1550
* feat: generate completion subcommand by @plustik in https://github.com/dandavison/delta/pull/1561
* Make hunk header code fragment display optional by @zmc in https://github.com/dandavison/delta/pull/1568
* Adding new theme in themes.gitconfig by @pablospe in https://github.com/dandavison/delta/pull/1544
* feat(theme): add arctic-fox custom theme by @anthony-halim in https://github.com/dandavison/delta/pull/1539
* --show-themes exit with error when no themes by @dandavison in https://github.com/dandavison/delta/pull/1611
* Bug fix:  reset syntax highlighter across grep sections by @dandavison in https://github.com/dandavison/delta/pull/1613
* Switch from vte to anstyle-parse (already used in dependencies) by @joshtriplett in https://github.com/dandavison/delta/pull/1638
* Parse filename unambiguously using color escape sequences by @joshtriplett in https://github.com/dandavison/delta/pull/1634
* Fix headers of modified binary files by @imbrish in https://github.com/dandavison/delta/pull/1629
* Upgrade bytelines to latest, without default features by @whitfin in https://github.com/dandavison/delta/pull/1597
* Add Catppuccin latte to light syntax themes by @dvic in https://github.com/dandavison/delta/pull/1573
* Update Arch Linux package URL in installation.md by @felixonmars in https://github.com/dandavison/delta/pull/1569
* Change Winget

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