(emacs.info) Programs

 
 Editing Programs
 ****************
 
    Emacs has many commands designed to understand the syntax of
 programming languages such as Lisp and C.  These commands can
 
    * Move over or kill balanced expressions or "sexps" ( Lists).
 
    * Move over or mark top-level expressions--"defuns", in Lisp;
      functions, in C ( Defuns).
 
    * Show how parentheses balance ( Matching).
 
    * Insert, kill or align comments ( Comments).
 
    * Follow the usual indentation conventions of the language (
      Program Indent).
 
    The commands for words, sentences and paragraphs are very useful in
 editing code even though their canonical application is for editing
 human language text.  Most symbols contain words ( Words);
 sentences can be found in strings and comments ( Sentences).
 Paragraphs per se don't exist in code, but the paragraph commands are
 useful anyway, because programming language major modes define
 paragraphs to begin and end at blank lines ( Paragraphs).
 Judicious use of blank lines to make the program clearer will also
 provide useful chunks of text for the paragraph commands to work on.
 
    The selective display feature is useful for looking at the overall
 structure of a function ( Selective Display).  This feature
 causes only the lines that are indented less than a specified amount to
 appear on the screen.

 
* Program Modes       Major modes for editing programs.
* Lists               Expressions with balanced parentheses.
* List Commands       The commands for working with list and sexps.
* Defuns              Each program is made up of separate functions.
 			  There are editing commands to operate on them.
* Program Indent      Adjusting indentation to show the nesting.
* Matching            Insertion of a close-delimiter flashes matching open.
* Comments            Inserting, killing, and aligning comments.
* Balanced Editing    Inserting two matching parentheses at once, etc.
* Symbol Completion   Completion on symbol names of your program or language.
* Which Function      Which Function mode shows which function you are in.
* Documentation       Getting documentation of functions you plan to call.
* Change Log          Maintaining a change history for your program.
* Tags                Go direct to any function in your program in one
 			  command.  Tags remembers which file it is in.
* Emerge              A convenient way of merging two versions of a program.
* C Modes             Special commands of C, C++, Objective-C,
                           Java, and Pike modes.
* Fortran             Fortran mode and its special features.
* Asm Mode            Asm mode and its special features.

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