Elisp Mode

• Start REPL with ielm.
• Execute expression in mini-buffer with M-:.
• Debug config starting Emacs with: emacs --debug-init.
• Reload config in current buffer with M-x eval-buffer.

Org Mode

• Cheatsheet: http://xahlee.info/emacs/emacs/emacs_org_markup.html
• Zettelkasten with Org: https://github.com/egh/org-mode-zettelkasten
• Wrapping lines (M-x fill-paragraph / M-q): http://ergoemacs.org/emacs/emacs_unfill-paragraph.html
• Show the markup with M-x visible-mode
• Wrap long lines with M-x visual-line-mode

Haskell Mode

• Generate TAGS for all the project dependencies with codex update command and then load them with M-x visit-tags-table. Jump to tag is now possible with M-..

Color Themes

• When switching between them, disable previous themes with M-x disable-theme to not have interference.

Tags

• Create tags with custom script ctags-citre.
• Tags are not used if eglot is enabled. Disable it with eglot-shutdown to use tags with citre.
• With the citre-mode, see https://github.com/universal-ctags/citre/blob/master/docs/user-manual/citre-peek.md#peek-the-definition-of-a-symbol on how to navigate when using citre-peek.

Annotations and Overlays

• Mark a region with annotate-annotate
• List annotations with annotate-show-annotation-summary
• Disable with annotate-toggle-all-annotations-text
• Overlay a symbol with symbol-overlay-put
• Disable with symbol-overlay-remove-all

Merging changes

• vdiff / ediff: to merge changes between different files
• smerge-mode / smerge-ediff: to merge diff3 output from git

Spelling

• Correct closest misspelled word with z =.
• Change language with jinx-languages.
• Enable text-mode to check the grammar with languagetool (run first systemctl start languagetool.service).

Tree-Sitter

• Highlight nodes of the code with tree-sitter-query-builder. You can see the full code structure with tree-sitter-debug-mode. Highlight query example for Python:

(type (identifier) @var)
(return_statement (call (identifier)) @var)

GPT

• Select a piece of text and call gpt-dwin or codegpt.

Jupyter Notebooks

• First convert a notebook to Org with pandoc notebook.ipynb -o notebook.org.
• Execute its code blocks using https://github.com/nnicandro/emacs-jupyter.

Tabs

• Select with: M-x tab-switch.

Emacs packages

• Refresh repos with: package-refresh-contents.
• Upgrade all new available versions with: package-list-packages and later press U x.

Saving/restoring sessions

• Save current session (windows/buffers) with: desktop-save
• Restore session with: desktop-change-dir

• Use *-ts-mode in all the hooks for language modes.