In-place block editing: mockup

Compy's code editor keeps your program valid Lua at all times: you change it one block at a time, and a block is saved only when Lua can read it. This mockup tries editing a block right where it sits in the program, instead of in a separate field at the bottom of the screen.

Status line on top of the block being edited, as in the console Move by line, as in the IDE: the block opens at the highlighted line, and typing starts a new line there Tab opens a block; Enter only saves Reset the sample file

Keys: browsing

Up / Down	Move one line (one block when "Move by line" is off)
Ctrl+Up / Ctrl+Down	Move to the start of the previous / next block
PgUp / PgDn	Move one page
Home / End	First line / the empty row after the last block
Alt+Up/Down, Alt+PgUp/PgDn	Scroll the view only
Enter (or Tab)	Edit the highlighted block, cursor on the highlighted line
typing	Start a new line at the highlighted line, inside its block; on a blank line, the code replaces it. With "Move by line" off: a new block above the highlight
Ctrl+Enter	New empty block below the highlight

Keys: editing

Enter	Save the block (reformats it); if the code is unfinished at the end, start a new line
Shift+Enter	New line
Esc	Cancel (asks first if you changed something)
arrows, Home, End	Move the cursor inside the block; Up/Down stop at its first/last line
PgUp/PgDn, Alt+arrows	Scroll the view; the block may leave the screen
arrows, Enter, Esc, typing	When the block is out of view: bring it back first (typed letters are kept)

What the mockup leaves out

• Formatting on save re-indents only: spacing inside a line is kept.
• No undo, copy/cut/paste, block delete, reorder, search, or file saving.
• Blocks are split with luaparse (Lua 5.1), close to the IDE's splitter.