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Edlog

Edlog is a simple editor for N-Prolog. Edlog is subset Edwin.

Edlog

Invocation

edit(filename) in the N-Prolog REPL.

edlog or edlog filename on terminal.

Commands

Key Command
CTRL+X CTRL+S Save file
CTRL+X CTRL+C Quit editor with save
CTRL+X CTRL+I Insert file
CTRL+X CTRL+Z Quit editor without save
CTRL+X CTRL+W Save buffer to file
CTRL+X CTRL+L Save region to file

Editing

The key bindings are Emacs like.

Key Binding
Enter Automatically indent
Insert Switch between insert/overwrite
Tab Insert tab
BackSpace Delete previous char
Delete Delete next char
CTRL+F Move right
CTRL+B Move left
CTRL+P Move up
CTRL+N Move down
CTRL+J End of line
CTRL+D Delete
CTRL+H Backspace
CTRL+A Beginning of line
CTRL+E End of line
CTRL+V Page down
ESC V Page up
CTRL+K Cut selection
CTRL+U Uncut selection
CTRL+L Go to line
CTRL+S Search for word foward
CTRL+R Search for word backward
CTRL+T Replace word
ESC TAB Complete builtin function or syntax
ESC < Goto top page
ESC > Goto end page
ESC f Move right in word units
ESC b Move left in word units
ESC CTRL+F Move right in S-exp units
ESC CTRL+B Move left in S-exp units
ESC CTRL+N Move right in list units
ESC CTRL+P Move left in list units
ESC CTRL+U Move up in list structure
ESC CTRL+D Move down in list structure
ESC ^ Mark (or unmark) row for selection. "ESC ^" marks the current row, then cursor up or down selects rows. "ESC ^" again unmarks.
←　→　↑　↓　 Usual cursor movement
Home Display top page
End Display end page
PageUp Page up
PageDown Page down

Note

Edlog supports Unicode. Edlog

Tmux

Using tmux is very convenient. Pressing CTRL+B followed by % will split the screen into two panes. You can start Edlog on the left side and N-Prolog on the right side. When you want to finish, detach by pressing CTRL+B followed by D in the terminal. To reattach, use tmux attach. The previous state will be restored.

To easily move between the two split screens, add the following setting to the ~/.tmux.conf file: set -g mouse on

Spec

  • main buffer row-size 5000, col-size 256 (defined in edlis.h)
  • sub buffer row-size 1000, col-size 256 (defined in edlis.h)

Hint to modify

The structure of the buffer is extremely simple. Each line consists of 256 characters and is initially initialized to 0. The line ends with an EOL character. The remaining part is left unused. Although there is a lot of waste, the simple structure makes it easy to understand.

The color specification for syntax highlighting is described around line 60 in edlis.c. The curses library allows for 16 color settings. By modifying this part, you can change it to your desired colors.

const enum Color ed_syntax_color = RED_ON_DFL;
const enum Color ed_builtin_color = CYAN_ON_DFL;
const enum Color ed_extended_color = MAGENTA_ON_DFL;
const enum Color ed_string_color = YELLOW_ON_DFL;
const enum Color ed_comment_color = BLUE_ON_DFL;

Parentheses highlighting is handled by emphasis_lparen() & emphasis_rparen(). If you change the color settings here, you can modify the color used for bracket highlighting.

CHECK(addch, ')');
ESCBORG();
if (pos.row >= ed_start) {
ESCMOVE(pos.row + TOP_MARGIN - ed_start,
pos.col + LEFT_MARGIN);
ESCBCYAN();   <----- -------------- color
CHECK(addch, '(');

When the Enter key is pressed, tabs are automatically calculated, and spaces are inserted. The tab settings are handled by calc_tab(). By changing the constants here, you can adjust them to your preference.


int calc_tabs()
{
   int col;

   if (ed_row == 0)
   return (0);

   col = 0;
   while (ed_data[ed_row - 1][col] == ' ') {
   col++;
   }
   return (col);

}