Improve default pretty diff colors

[snejus]

• Switch default text_diff_added color from bold red to bold green; unify all diff/case comparisons to use text_diff_added and text_diff_removed colors consistently.
• Simplify color handling and setup: introduce cached color config (validation + legacy normalization), consolidate regexes
• Remove unused colors names
• Update ui configuration docs.

beet write -p year:2000..2005

Before

After

beet move -p albumtype:broadcast

Before

After

Summary by Sourcery

Improve default diff colors from red to green and streamline color handling by refactoring ANSI code management, removing legacy logic, and unifying diff highlighting. Also extract a cached changed_prefix property and update UI config documentation.

Enhancements:

• Introduce cached get_color_config and consolidate ANSI escape regex patterns to simplify color configuration parsing
• Refactor diff highlighting to consistently use text_diff_added and text_diff_removed and simplify _colordiff implementation
• Add ChangeRepresentation.changed_prefix cached property for consistent ‘not equal’ prefix formatting

Documentation:

• Update UI configuration documentation to reflect new default colors and removed settings

Chores:

• Remove unused color names and legacy normalization code

[Copilot]

Pull Request Overview

This PR improves the default pretty diff colors in the beets music library tool by changing the default text_diff_added color from bold red to bold green and unifying diff/case comparisons to consistently use the new color scheme. Additionally, it simplifies color handling with a cached configuration system, consolidates regex patterns, removes unused color definitions, and updates documentation.

• Changes default text_diff_added color from bold red to bold green for better visual distinction
• Unifies all diff comparisons to use text_diff_added and text_diff_removed colors consistently
• Refactors color system with cached configuration validation and consolidated regex patterns

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/reference/config.rst	Updates configuration documentation with new color defaults and improved formatting
docs/changelog.rst	Documents the UI color changes in the changelog
beets/ui/commands.py	Refactors diff display logic to use cached prefix and consistent color naming
beets/ui/init.py	Major refactor of color system with cached config, validation, and simplified diff logic
beets/plugins.py	Changes plugin loading log level from info to debug
beets/config_default.yaml	Updates default color configuration removing unused colors and changing diff colors

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[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.53%. Comparing base (7340f15) to head (91a97ec).

Files with missing lines	Patch %	Lines
beets/ui/__init__.py	88.88%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5949      +/-   ##
==========================================
+ Coverage   66.49%   66.53%   +0.04%     
==========================================
  Files         117      117              
  Lines       18122    18099      -23     
  Branches     3071     3062       -9     
==========================================
- Hits        12051    12043       -8     
+ Misses       5415     5404      -11     
+ Partials      656      652       -4     

Files with missing lines	Coverage Δ
beets/ui/commands.py	74.85% <100.00%> (+0.04%)	⬆️
beets/ui/__init__.py	79.41% <88.88%> (+1.33%)	⬆️

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[semohr]

One idea for a small ergonomics improvement: right now the color setting requires an explicit yes/no choice. It could be nice to add a third auto option that detects whether the current terminal supports color output.

This would mirror Django’s approach in django.core.management.color.supports_color. Would you be interested in adding this as part of the PR? I feel like it could fit.

No pressure if not. Independent of that, I’ll take a closer look this weekend. I haven’t dug too deep into the CLI layer yet, so it might be a good spot for others to weigh in as well.

[snejus]

There are a few related issues (for example, #2152 and #5837) - I'll be happy to fix them and implement your suggestion in a separate PR. Would you mind creating a small issue for this?

I feel like your suggestion could be extended with a standard --color=[yes|no|auto] command-line option, which is present in many core Linux CLI tools.

I'll start this right away, actually!

[semohr]

There are a few related issues (for example, #2152 and #5837) - I'll be happy to fix them and implement your suggestion in a separate PR. Would you mind creating a small issue for this?

Here you go: #5966

[snejus]

@sourcery-ai review

[sourcery-ai]

Reviewer's Guide

This PR overhauls the pretty diff coloring by switching the default added color to green, refactoring and caching the color configuration with consolidated ANSI regexes, simplifying the diff and highlighting logic, and cleaning up unused color names alongside documentation updates.

Entity relationship diagram for updated color configuration

erDiagram
    CONFIG ||--o{ COLOR_CONFIG : contains
    COLOR_CONFIG {
      color_name string
      ansi_code string
    }
    COLOR_CONFIG ||--|{ ColorName : uses
    ColorName {
      name string
    }

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File-Level Changes

Change	Details	Files
Update default diff colors and unify usage	Change text_diff_added default from bold red to bold green Ensure all diff and case-comparison routines use text_diff_added and text_diff_removed colors Update UI config defaults accordingly	beets/config_default.yaml beets/ui/__init__.py beets/ui/commands.py
Refactor color configuration with caching and regex consolidation	Introduce get_color_config() with @cache to parse and validate color settings Remove global COLORS state and legacy _colorize implementation Rename ANSI_CODES to CODE_BY_COLOR and COLOR_ESCAPE constant adjustment Add precompiled ANSI_CODE_REGEX and ESC_TEXT_REGEX patterns	beets/ui/__init__.py
Simplify diff and highlighting logic	Streamline _colordiff to accumulate before/after strings instead of building lists Consolidate insert/delete/replace cases using unified colorize calls Update colordiff and related text-splitting to use new regex and helper logic	beets/ui/__init__.py
Refactor command-line UI prefixes for changed items	Add cached_property changed_prefix in ChangeRepresentation Replace inline colorize calls for ‘≠’ prefix with the new property	beets/ui/commands.py
Remove unused color names and update documentation	Drop obsolete color entries (e.g., added, removed, changed_highlight) from defaults Refresh UI configuration docs and changelog to reflect new color options	docs/reference/config.rst docs/changelog.rst

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