Sprint 11 - Text sculptor

[aldum]

Text editing experience where the unit of change is a logically consistent atom, and only valid modifications are accepted, hence the file being worked on can never get into a syntactically invalid state. Editing is achieved by moving a highlight around the file, and selecting a portion of the text for modification.

For a proof of concept, create the plaintext version, where there are no syntactic constraints, text is edited line-by-line.

Terminology:

• save - each valid edit is persisted, so it refers to a finished editing action

Features:

• 16 lines by 64 characters view window

• Load file / create file (edit('name'))

• when a file is opened, the highlight starts at the end, allowing adding new lines without any navigation action on the part of the user

• similarly, when editing is finished, the highlight advances automatically

• handles multiline - while only a single line can be selected for editing, newlines can be inserted in the input, which will be converted to multiple lines upon saving

• scrolling

  • it's possible to move the visibility window, and leave the highlight behind
  • focus follows highlight - if the highlight is moved, it's scrolled into view
  • if it's above the current window, the scroll changes so that the first line visible is selected
  • if it's below, it moves to the last line visible

• word wrap - no horizontal scrolling

• input

  • overflow indicator - if there are more lines off screen, show arrows
  • show line number

Workflow and keys:	Action	Key
Edit highlighted	Esc
Finish editing (eval) [save]	Enter
Reset edited text to original	Esc
Insert original at cursor	Shift+Esc
Delete highlighted line/chunk	Ctrl+Delete
	Ctrl+Y
Move highlight up	Up
Move highlight down	Down
Scroll up	PgUp
Scroll down	PgDown

[aldum]

33

[nagydani]

Accepted.