Editor

The editor takes advantage of Spectrum Next's tilemap display mode which can displays 80x32 characters. The editor uses the top line for a menu and the bottom two lines for status information. Astrum will, by default, load the last file it was editing. You can prevent this file from loading by holding down the Symbol Shift key whilst Astrum is loading.

If you are bringing source code to Astrum then read Some words about source code

Mouse

A PS/2 mouse can now be used to access the menu system and to change cursor position. A left click will move the cursor to that position. A right click in the rightmost or leftmost column will move to a new position in the document based on the position relative to the top of the screen. Click at the top for the start of the document and near the end for the bottom of the document. You can also use the mouse wheel to move the cursor's location up and down the document. By default, this mouse functionality is turned off. You can turn it on from the Settings menu item in the Help menu.

Edit Keys

INV VIDEO	Page down
TRUE VIDEO	Page up
ENTER	New line below current line
CS + ENTER	New line above current line
SS + ENTER	Split line at cursor
EDIT	Menu
GRAPH	End of line
CS + SPACE	Next tab
SS + A	~
SS + S	\|
SS + D	\
SS + F	{
SS + G	}

Extended keys

Press EXTEND MODE. The border and status area will go red and wait for a key:

T	Top of document
B	Bottom of document
S	Start of line
E	End of line
F	Find
A	Find again
I	Find next use of symbol under cursor
D	Find definition of symbol
G	Goto line
O	Toggle insert/overwrite
P	©
V	Paste cut or copied block
J	Join next line

Some commands (Top, Bottom, Find, Find Definition, Goto) drop a temporary bookmark. This is so you can look around and then go back. You can go back with EXTEND 6. There may be multiple steps and you can go forward with EXTEND 7. Explicit temporary bookmarks can be dropped with EXTEND 0.

In order to keep source files small Astrum uses a single space to separate label from opcode or opcode from arguments. If there is no label then just a single space is used at the start of the line. Astrum automatically formats this into correctly indented code in the editor. Of course this can cause an issue for source that uses a different format.

SS + E	Delete to end of line
SS + Q	Delete to start of line
SS + F	Toggle auto format.
SS + A	Assemble
SS + S	Save
SS + X	Delete current line (or marked block)
SS + Delete	Delete to right (remains in extend mode)

You can mark the start of a line with ;* and a digit 1-4. You can then navigate back to the bookmark with the extend keys:

1	Goto bookmark 1 ;*1
2	Goto bookmark 2 ;*2
3	Goto bookmark 3 ;*3
4	Goto bookmark 4 ;*4

Marking blocks

There are two kinds of blocks: line and part-of-line

To mark a line block press EXTEND MODE then up or down. The block is shown in bright yellow. Once you have marked a number of lines you can press:

EDIT	Cancel block mark
C	Copy block (if no block marked it copies current line)
X	Cut block (if no block marked it cuts current line)
SS + X	Delete block

You can write out the current block from the Block and menu. Alternatively you can join a file from the same menu.

Marking parts of a line

You can mark part of a line by pressing EXTEND MODE and then left or right.