add-picker

name	add-picker
description	Scaffold a new jj_fzf_* picker following the shared contract — dependency guards, cancel code 130, tab-delimited templates, binding wiring, README entry. Invoke manually; has side effects.
disable-model-invocation	true

Add Picker

Procedure for adding a new jj_fzf_<name> picker. Must obey the shared contract in .claude/rules/pickers.md.

Inputs

Ask the user for:

1. name — suffix after jj_fzf_ (e.g. branch, conflict). Filename will be functions/jj_fzf_<name>.fish.
2. source — what jj subcommand produces the candidates (e.g. jj log, jj bookmark list, jj op log).
3. side effect — exactly one of:
   • insert identifier at cursor (commandline -i)
   • cd into a path
   • open in $EDITOR
   • run a mutating jj command (requires confirmation prompt)
4. preview — optional jj show-style preview command. If jj show is used, always add --ignore-working-copy.

Do not mix side-effect types in a single picker.

Steps

1. Create functions/jj_fzf_<name>.fish

Use this skeleton. Guards and exit codes are mandatory; see .claude/rules/fish.md.

function jj_fzf_<name> --description '<one-line description>'
    type -q jj; or begin
        echo "jj_fzf_<name>: jj is not installed" >&2
        return 127
    end
    type -q fzf; or begin
        echo "jj_fzf_<name>: fzf is not installed" >&2
        return 127
    end

    # Emit \t-delimited columns: <id>\t<human-visible>\t...
    set -l template '<jj template expression>'

    set -l selection (
        jj <source> --color=always --ignore-working-copy \
            -T "$template" 2>/dev/null \
        | fzf --ansi --no-sort \
              --prompt='jj <name> > ' \
              --delimiter='\t' --with-nth=2 \
              --preview='<preview command> {1}' \
              --preview-window='right:60%:wrap'
    )

    test -z "$selection"; and return 130

    set -l id (string split -f1 \t -- $selection)
    # Exactly one of:
    commandline -i -- $id; and commandline -f repaint
    # --- or ---
    # cd -- $path; and commandline -f repaint
    # --- or ---
    # set -l editor $EDITOR; test -z "$editor"; and set editor (set -q VISUAL; and echo $VISUAL; or echo vi)
    # eval $editor $path
end

2. Wire into functions/jj_configure_bindings.fish

Two edits:

• Add '<name>=?' to the argparse list
• Add the corresponding bind line:

set -q _flag_<name>; and test -n "$_flag_<name>"; and bind $_flag_<name> jj_fzf_<name>

3. Update README.md

• Add a row to the "Jobs this plugin hires itself to do" table
• Add a bullet under the Available pickers list
• Add the flag to the jj_configure_bindings example snippet

4. Update CLAUDE.md (only if the picker list is referenced there)

Currently CLAUDE.md references pickers by category, not by name — edit only if the new picker changes the category description.

Verification

fish_indent --check functions/jj_fzf_<name>.fish functions/jj_configure_bindings.fish
fishtape tests/*.test.fish

Then manually in an interactive fish session with jj and fzf installed:

source functions/jj_fzf_<name>.fish
jj_fzf_<name>                  # pick something → verify side effect
jj_fzf_<name>                  # press Esc → command returns 130, no side effect

If the picker mutates state, also test the confirmation prompt path.

Done when

• New function file exists and loads cleanly
• jj_configure_bindings accepts the new flag
• README is updated in all three places (table, pickers list, example snippet)
• fish_indent --check and fishtape pass
• Manual smoke test (pick + cancel) succeeds