whi

whi is a smarter which that also lets you rearrange your current shell's PATH safely. Install the shell integration once, run the high level commands (prefer, move, switch, clean, delete, undo, redo, reset, diff, apply, save, load), and grab the helper shortcuts if you like terse aliases.

Heads up: mutation commands only run after the integration exports WHI_SHELL_INITIALIZED=1. If you see the integration warning, run the snippet for your shell and add it to your config for persistence.

Install & Integrate

cargo install whi

Pick the snippet for your shell and paste it into a terminal. Add the same line to the END of your shell config so it runs on startup after all PATH modifications.

# Bash
eval "$(whi init bash)"      # add to the END of ~/.bashrc (or the file you source)

# Zsh
eval "$(whi init zsh)"       # add to the END of ~/.zshrc

# Fish
whi init fish | source        # add to the END of ~/.config/fish/config.fish

Important: The integration must be at the END of your config so whi captures your final PATH after all modifications (homebrew, cargo, etc.).

The snippet:

• Loads any previously saved PATH (from ~/.whi/saved_path_*)
• Defines helper functions (whip, whim, whis, whiu, whir, whil, etc.)
• Exports WHI_SHELL_INITIALIZED=1 so whi knows it's safe to mutate PATH
• Captures the final PATH as your session baseline for undo/diff tracking

Core Commands

All of these operate on the current shell session. Each command prints the updated PATH; the integration captures the string and updates PATH for you.

# Which like usage
whi cargo
whi -n cargo                 # no index, same output which gives
whi -a cargo                 # shorthand: whia
whi -an cargo

# Show full path (line separated)
whi -f
whi -fn

# Prefer a specific executable or add a path
# Makes the minimal required change to path / puts it at
# the lowest spot in path that achieves it being the winner
whi prefer cargo 5
whi prefer cargo ~/.cargo/bin
whi prefer cargo github release
whi prefer ~/.local/bin      # no executable provided -> acts like fish_add_path

# Move and swap entries by index (1-based)
whi move 12 1
whi switch 4 9

# Clean duplicates
whi clean

# Delete entries
whi delete 3 9               # specific indices
whi delete ~/.local/bin      # exact path
whi delete build temp        # fuzzy - all paths matching pattern

# Undo/redo/reset PATH changes
whi undo                     # undo last operation
whi undo 3                   # undo last 3 operations
whi redo                     # redo next operation
whi redo 2                   # redo next 2 operations
whi reset                    # reset to initial session state

# Inspect PATH changes
whi diff                     # show changes since session start
whi diff full                # show all entries (including unchanged)

# Persist PATH to shell config files
whi apply                    # save to current shell's config
whi apply fish               # save to specific shell
whi apply all                # save to all shells (bash/zsh/fish)

# Profile management
whi save work                # save current PATH as profile "work"
whi load work                # load profile "work"
whi list                     # list all saved profiles
whi rmp work                 # remove profile "work"

Querying executables

whi node                     # show the first match (with PATH index)
whi --all node               # list every match

# This is cool ... list all matches, newline, list full path
# with all path entries containing the binary highlighted
whi --full cargo

Useful flags:

• -a/--all
• -f/--full
• -l/--follow-symlinks
• -s/--stat
• -0/--print0
• -q/--quiet
• --silent
• --color <auto|never|always>
• --path <PATH>

whi --help shows the verbs (prefer, move, switch, clean, delete, undo, redo, reset, diff, apply, save, load, list, rmp). The integration intercepts those public names and rewrites them to the hidden __… subcommands that actually mutate the environment.

Helper Shortcuts

These are defined by the integration and map directly to the core commands:

whip cargo github release    # -> whi prefer ...
whim 12 1                    # -> whi move ...
whis 4 9                     # -> whi switch ...
whic                         # -> whi clean
whid 3 9                     # -> whi delete ...
whiu                         # -> whi undo
whiu 3                       # -> whi undo 3
whir                         # -> whi redo
whir 2                       # -> whi redo 2
whil work                    # -> whi load work
whia python                  # -> whi --all python

Use whichever spelling you prefer—both routes converge in Rust.

Persistence & State

• Saved PATH files live in ~/.whi/ (saved_path_bash, saved_path_zsh, saved_path_fish). whi apply all writes to all three. Each save creates a *.bak backup before overwriting.

• Profile storage lives in ~/.whi/profiles/. Each profile is a file containing a colon-separated PATH string. Use whi save <name> to save current PATH as a profile, whi load <name> to restore it, and whi list to see all profiles.

• Session snapshots live in ${XDG_RUNTIME_DIR:-/tmp}/whi-<uid>/session_<ppid>.log. Each PATH modification writes a snapshot (timestamp + full PATH string). The undo/redo system navigates through these snapshots with a cursor. Sessions keep up to 500 snapshots (initial + last 499) and auto-cleanup old sessions after 24 hours.

• Undo cursor lives in ${XDG_RUNTIME_DIR:-/tmp}/whi-<uid>/session_<ppid>.cursor. Tracks your position in the snapshot history. No cursor file means you're at the latest state.

How undo/redo works

Every PATH mutation writes a snapshot. The undo system navigates backwards through snapshots, and redo moves forward. If you undo then make a new change, the "future" timeline is discarded (standard undo/redo behavior).

# Example session:
$ whi move 5 1              # snapshot 1 (initial is snapshot 0)
$ whi delete 3              # snapshot 2
$ whi undo                  # cursor moves to snapshot 1
$ whi undo                  # cursor moves to snapshot 0 (initial)
$ whi redo                  # cursor moves to snapshot 1
$ whi prefer cargo 2        # snapshot 3 (snapshot 2 discarded, new timeline)
$ whi reset                 # back to snapshot 0, cursor cleared

whi diff compares your current PATH to the initial session snapshot, so it shows all changes including manual export PATH=... modifications (not just whi operations).

Notes

• Mutating commands exit with an instructional message if the integration is missing. Copy the snippet shown, run it, and add it to your shell config for future sessions.

• Profile loading includes self-protection: if a profile doesn't contain the current whi directory, it's silently appended to prevent losing access to whi itself.

• If you want to script against whi directly, capture stdout and export the string yourself. The integration just automates that for interactive use.

License

MIT