Add dir_length option

[alienxp03]

Add dir_length configuration option

Fixes: #272

This PR adds a new dir_length configuration option that allows users to control how many directory components are included in session names.

What's Changed

• New config option: dir_length in sesh.toml (defaults to 1 for backwards compatibility)

Problem

sesh only uses the current directory name, which won't work if you have the same directory name with different parent. In the example below, both will only refer to the same one child session:

- /Users/user/project1/child → child
- /Users/user/project2/child → child

New changes

With dir_length = 1 (default):
- /Users/user/projects/sesh → sesh

With dir_length = 2:
- /Users/user/projects/sesh → projects/sesh

With dir_length = 3:
- /Users/user/projects/sesh → user/projects/sesh

Configuration

# ~/.config/sesh/sesh.toml
dir_length = 2  # Uses last 2 directories. (Optional, empty config will defaults to 1)

Would love feedback on these changes. Thanks!

[joshmedeski]

Sorry for not responding to this sooner, can you fix the merge conflicts on this?

I'm happy to look it over this week and help get it merged, I know people will appreciate this feature!

[alienxp03]

No worries. I have rebased the branch. Do let know your thoughts!

[Copilot]

Pull Request Overview

This PR adds a new dir_length configuration option that allows users to control how many directory components are included in tmux session names, addressing the issue where sessions with identically named directories in different parent paths would collide.

Key Changes:

• Added DirLength field to model.Config with default value of 1 for backwards compatibility
• Updated dirName() function to support multi-component directory paths based on configuration
• Modified NewNamer() to accept config parameter and propagate it throughout the codebase

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
model/config.go	Added DirLength field to Config struct
namer/dir.go	Implemented logic to extract N directory components from paths
namer/dir_test.go	Added comprehensive test coverage for directory naming with various lengths
namer/namer.go	Updated constructor to accept and store config
namer/git.go	Modified to use dirName() for repository naming
namer/git_bare.go	Modified to use dirName() for bare repository naming
namer/root_git.go	Simplified error handling and switched to dirName()
configurator/configurator.go	Added validation to ensure DirLength defaults to 1 if not set
seshcli/root_command.go	Updated NewNamer() call to pass config
namer/namer_test.go	Updated all test cases to include config parameter
namer/git_test.go	Updated all test cases to include config parameter
go.mod	Moved lipgloss dependency from direct to indirect
README.md	Added documentation for the new configuration option

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[joshmedeski]

This looks good, thanks for your patience on this.