gistfile1.md

structured-haskell-mode

This minor mode provides structured editing operations based on the syntax of Haskell. In short-hand it's called SHM and throughout the codebase, too. It acts a bit like, and is heavily inspired by, paredit-mode for Emacs.

Features

Its features work by parsing the current declaration with an executable called structured-haskell-mode, and then creates marks for all the nodes' positions in the buffer.

Feature | Explanation --- | --- | --- | Indenting: shm/newline-indent takes the current node and its type into consideration giving very predictable and useful behaviour. | Going to parent: shm/goto-parent jumps to the start of the parent. | Going to parent end: shm/goto-parent-end jumps to the end of the parent. | Adding a list item: shm/newline-indent (C-j) will automatically add a comma when inside a list. | Adding operands: shm/add-operand (C-+) will look at the current node and add another operand in the direction the cursor is leaning towards. | Auto-reindenting: Typing and deleting will automatically re-indent dependent code blocks. | Raising: shm/raise raises the current node to replace its parent. If its direct parent is not the same expression type, it continues up the tree. | Re-indenting: shm/newline-indent and shm/delete-indentation allow you to bring nodes inwards or outwards relative to the parent. | Record syntax: Creating new elements with record syntax, like lists (and tuples) automatically adds the right separators. | Transposition: shm/tranpose will swap two sibling nodes. | Copy/pasting: shm/kill and shm/yank take indentation into account, and automatically normalize so that re-inserting will indent properly.