Difference between revisions of "IDE Window: Code Templates"

From Lazarus wiki
Jump to navigationJump to search
Line 37: Line 37:
 
== Example 2 - Using macros ==
 
== Example 2 - Using macros ==
  
This second example shows you how to create a code template 'w' which inserts a line of code which repeats the name of the current procedure somewhere in your code. For long names this can be quite a time saving, and it also types it for you without any spelling mistakes!
+
This second example shows you how to create a code template 'w' which repeats the name of the current procedure somewhere in your code. For long names this can be quite a time saver, and it also types it for you without any spelling mistakes!
  
 
* In the Code Templates dialog, click on the [Add] button. In the dialog which pops up set Token to 'w', and Comment to 'writeln(ProcName)', then click [OK].
 
* In the Code Templates dialog, click on the [Add] button. In the dialog which pops up set Token to 'w', and Comment to 'writeln(ProcName)', then click [OK].

Revision as of 17:03, 10 January 2012

Deutsch (de) English (en) español (es) suomi (fi) français (fr)

What are Code Templates?

A Code Template is a section of 'boiler plate' code with an associated abbreviation which invokes its insertion. For example, you can type 'cl' in the Source Editor, and then press the Ctrl+J keyboard shortcut to invoke the code template(s) starting with 'cl'. This feature is a great time saver.

The Code Templates dialog (accessed via the Tools|Code Templates... menu option) allows you to edit existing templates, or add your own templates.

Code template text can contain macros, and you can even add your own macros to the list of those already available by creating a design time package and using the macrointf.pas of the IDEIntf package.

Example 1 - ifb

type

  ifb|

Here the pipe symbol (|) represents the blinking screen cursor. Press Ctrl+j. The three characters you typed ('ifb') will be expanded to

  if | then begin

  end;

Again the pipe represents the cursor blinking onscreen. You will see that the cursor has been moved. This template is called 'ifb' and it is defined as follows:

if | then begin

end; 

This time the pipe '|' is an actual character you type as part of this code template's definition. It stipulates where the cursor will be positioned after the template has been inserted.

Example 2 - Using macros

This second example shows you how to create a code template 'w' which repeats the name of the current procedure somewhere in your code. For long names this can be quite a time saver, and it also types it for you without any spelling mistakes!

  • In the Code Templates dialog, click on the [Add] button. In the dialog which pops up set Token to 'w', and Comment to 'writeln(ProcName)', then click [OK].
  • Your new code template item has been added to the list box.
  • In the source below fill in
 writeln(' ',|);
  • Here pipe is an actual pipe character defining the new cursor position. Now place the cursor after the first apostrophe (') and click on the 'Insert macro' button. A dialog pops up listing all available code macros. Choose 'ProcedureName' and click 'Insert Macro'. You should now have:
 writeln('$ProcedureName() ',|);
  • Click [OK] to save and close the Code Templates dialog.
  • Move the cursor into the body of a method, and type 'w'. For instance:
 procedure TForm1.FormDestroy(Sender: TObject);
 begin
   w|
 end;

(Here the pipe represents the blinking cursor, not a character).

  • Press Ctrl+j. You will get:
 procedure TForm1.FormDestroy(Sender: TObject);
 begin
   writeln('TForm1.FormDestroy ',|);
 end;

Auto complete on

Code templates can be invoked by the shortcut Ctrl-j or by an event. You can set for each template on what event it is executed. You can enable none, some or all.

  • line break - whenever the user presses the 'Return' or 'Enter' key
  • space - whenever the user presses the Space bar.
  • word end - whenever the user presses a key that ends a word. For example when typing 'b;' the code template 'b' can be executed.
  • do not add character - this option can be combined with any of the above. When enabled the triggering key will not be inserted. For example when the option 'space' is enabled and the user triggers a template by pressing the space bar, the space character will not be inserted in the source editor.

Macros

Macros have the form $(MacroName) or $MacroName(Param1,...). Macros can be nested.

Define your own macros

You can register your own macros by writing a design time package and installing it. See ide/codetemplatesdlg.pas procedure CreateStandardCodeMacros for examples.

DCI file format

The default dci file of the IDE is pcp/lazarus.dci, where pcp is your primary config path (e.g. under Linux $HOME/.lazarus). If this file is not present the IDE will copy the file ide/lazarus_dci_file.dci.

A dci file is a text file with a list of templates.

Each template starts with line [name | description]. The template's value are the following lines.