Eval expression

  

First type the Ctrl-x Ctrl-e 'eval expression' command. In the mini-buffer you can enter expressions which are C expressions. Typically the following forms are valid:

In this context, the Tab key can be used to expand the functions, user functions and variables names. If the mini-buffer is empty, a complete list of these is displayed in the message box.

Don't forget the semicolon ';' at the end of the C expression you want to evaluate, otherwise you will get a parser error line 0: syntax error message.

• insertchar (190);

  Inserts the argument at the current position. The function insertchar is one of the built-in functions available in to drive the editor. This example shows how to insert a special character (via its ASCII code).

• set_mode_font ("Latex", "9x15bold");

  This example shows how to change font in Latex mode.

• cmdshell ( "date | awk '{print $4}' ");

  cmdshell is a built-in editor function. The argument is executed in a sub-shell and the result is inserted at the current position.

• selectwindow(newwindow());readfile(fileselect());

  Opens a new text window, selects it, selects a file from a file-selector and loads it. Obviously it is easier to use the Window menu, but this example shows the facilities to interpret built-in editor functions through an eval expression command.

• keydef ("C-mode", "^xe", "gotoendoffile" );

  In C-mode, binds gotoendoffile function to Ctrl-x e. The second argument syntax (keybinding), can be:

  	    "c"     --> key.
  	    "^[c"   --> Esc key.
  	    "^[^c"  --> Esc Ctrl key.
  	    "^c"    --> Ctrl-key.
  	    "^xc"   --> Ctrl-x key.
  	    "^x^c"  --> Ctrl-x Ctrl-key.

  where `c' is any character except `^'. Furthermore `^^' appoints the character `^' (so ^x^^ is Ctrl-x ^), `^ ' and `^@' appoint the character null (code 0).

  It is also possible to bind keysym keys such as Home:

  	    "k"    --> key.
  	    "^[k"  --> Esc key.
  	    "^xk"  --> Ctrl-x key.

  where `k' is a keysym name (see §7.3.11 page ).