Add Logseq-like structural editing: task cycling, block movement, and wiki link wrapping

[Copilot]

Implements three structural editing features from Logseq Desktop to enable keyboard-driven task management and navigation.

Changes

• Task Status Cycling - logseq#CycleTaskStatus() cycles bullet points through (none) → TODO → DOING → DONE → (none) while preserving indentation

  • Keybinding: <Leader>t
  • Plug: <Plug>(logseq-cycle-task)

• Block Movement - logseq#MoveBlockUp() / logseq#MoveBlockDown() swap lines or visual selections with adjacent lines

  • Keybindings: <Alt-k> / <Alt-j>
  • Plugs: <Plug>(logseq-move-up) / <Plug>(logseq-move-down)
  • Supports both normal and visual mode

• Wiki Link Creation - logseq#CreateLink() wraps visual selection with [[]]

  • No default keybinding (avoids conflicts with <CR>)
  • Plug: <Plug>(logseq-make-link)

All features use <Plug> mappings for customization and apply only to logseq filetype buffers. Default keybindings use hasmapto() to avoid conflicts.

Example Usage

" On a bullet line:
- Research vim plugins

" Press <Leader>t repeatedly to cycle:
- TODO Research vim plugins
- DOING Research vim plugins  
- DONE Research vim plugins
- Research vim plugins  " back to start

" Visually select "vim plugins" and map to create link:
autocmd FileType logseq vmap <buffer> <Leader>l <Plug>(logseq-make-link)
" Result: - Research [[vim plugins]]

Testing

Added 13 unit tests covering all features, edge cases, and indentation preservation. All 29 tests pass.

Original prompt

Add more Logseq-like functionality

I am developing the vim-logseq plugin (written in Vimscript).
Current State: The plugin currently handles file detection, syntax highlighting, and basic searching (autoload/logseq.vim).
Goal: I want to implement "Logseq-like" structural editing features directly into the plugin.
Please write the Vimscript to implement the following three features. Provide the code for autoload/logseq.vim and the mappings for plugin/logseq.vim.

1. Task Status Cycling

Create a function logseq#CycleTaskStatus() that operates on the current line.

• If the line starts with - , check for task keywords.
• Cycle Order: (no task) -> TODO -> DOING -> DONE -> (no task).
• Constraint: Preserve existing indentation and bullet points.

2. Block Movement (Bubbling)

Create functions logseq#MoveBlockUp() and logseq#MoveBlockDown().

• These should move the current line (or visual selection) up or down by one line.
• Similar to Alt+Up/Down in Logseq Desktop.

3. Wiki Link Wrapping

Create a function logseq#CreateLink() for Visual Mode.

• It should wrap the selected text in double brackets: [[selected text]].

4. Mappings

In plugin/logseq.vim, expose these via <Plug> mappings so users can remap them, but provide these defaults if no conflict exists:

• Task Cycle: <Leader>t (or Ctrl+Enter if valid)
• Move Up/Down: <Alt-k> / <Alt-j>
• Make Link: <Enter> (Only in Visual Mode)

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