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The c4 editor

image

The c4 editor is somewhat similar to a stripped-down version of VI.
Enable the editor using #define EDITOR (in c4.h)
The current block being edited is in 'block@'.
Use '23 edit' to edit block #23.
Use 'ed' to re-edit the last edited block.
While in the editor, use ':!5 block!' to switch to another block.

Modes

There are 4 modes in the editor:

  • NORMAL
  • INSERT
  • REPLACE
  • COMMAND

These control keys are active in all modes:

Key Action
[ctrl]+a Insert/replace tag: COMPILE
[ctrl]+b Insert/replace tag: DEFINE
[ctrl]+c Insert/replace tag: INTERP
[ctrl]+d Insert/replace tag: COMMENT
[ctrl]+e Send the current line to the outer interpreter
[ctrl]+h Left 1 char (and delete it if in INSERT mode)
[ctrl]+i Right 8 chars (also [tab])
[shift]+tab Left 8 chars
[ctrl]+j Down 1 line
[ctrl]+k Up 1 line
[ctrl]+l Right 1 char
[ctrl]+q Left 8 chars
[ctrl]+s Save the block to disk
[ctrl]+Home Goto the beginning of the first line
[ctrl]+End Goto the beginning of the last line
[ctrl]+x Delete the char under the cursor
[esc-esc] Goto NORMAL mode

NORMAL mode

Key Action
$ Goto the end of the line
_ Goto the beginning of the line
[CR] Goto the beginning of the next line
[SP] Right 1 char
1 Set tag: COMPILE
2 Set tag: DEFINE
3 Set tag: INTERP
4 Set tag: COMMENT
: Change to COMMAND mode
+ Save the current block and goto the next block
- Save the current block and goto the previous block
/ Specify search string, jump to next occurrence
# Redraw the screen
a Append: move right 1 char and change to INSERT mode (same as 'li')
A Append: goto the end of the line and change to INSERT mode (same as '$i')
b Insert a BLANK/SPACE into the current line
B Insert a BLANK/SPACE to the end of the block
c Change: Delete the current char and change to INSERT mode (same as 'xi')
C Change: Delete to the end of the line and change to INSERT mode (same as 'd$i')
d. Delete the char under the cursor (same as 'x')
d$ Delete to the end of the line
dd Copy the current line into the YANK buffer and delete the line
dw Delete the current word
D Delete to the end of the line (same as 'd$')
g Goto the top-left of the screen
G Goto the bottom-left of the screen
h Left 1 char
i Change to INSERT mode
I Goto the beginning of the line and change to INSERT mode (same as '_i')
j Down 1 line
J Join the current and next lines together
k Up 1 line
l Right 1 char
m Down 4 lines
M Up 4 lines
n Jump to next occurrence of search string
N Jump to previous occurrence of search string
o Insert an empty line BELOW the current line and change to INSERT mode
O Insert an empty line ABOVE the current line and change to INSERT mode
p Paste the YANK buffer into a new line BELOW the current line
P Paste the YANK buffer into a new line ABOVE the current line
q Right 4 chars
Q Left 4 chars
r Replace the char under the cursor with the next key pressed (if printable)
R Change to REPLACE mode
S Switch to last edited block
w Move right to the beginning of the next word
W Move left to the beginning of the previous word
x Delete the char under the cursor to the end of the line
X Delete the char to the left of the cursor (same as 'hx')
Y Copy the current line into the YANK buffer
Z Delete the char under the cursor to the end of the block

INSERT mode

In INSERT mode, all printable characters are inserted into the line.

  • [Enter] inserts a new line at the cursor.
  • [Backspace] moves left and deletes that character.

REPLACE mode

In REPLACE mode, all printable characters are placed into the line.

  • [Enter] moves to the beginning of the next line.
  • [Backspace] moves left and does not delete that character.

COMMAND mode

COMMAND mode is invoked when pressing ':' in NORMAL mode.

Command Action
rl ReLoad: discard all changes and reload the current block
w Write the current block if it has changed
w! Write the current block, even if it has NOT changed
wq Write the current block and quit (same as ':w' ':q')
q Quit, if the current block has NOT changed
q! Quit, even if the current block has changed
![any] Send [any] to the c4 outer interpreter