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GNU enscript
************

   This file documents the GNU enscript program.  This edition documents
version 1.6.4.

* Menu:

* Introduction::
* Invoking Enscript::
* Basic Printing::
* Advanced Usage::
* Configuration Files::
* Customization::
* The states Program::
* Writing New Highlighting Definitions::
* Index::

File: enscript.info,  Node: Introduction,  Next: Invoking Enscript,  Prev: Top,  Up: Top

Introduction
************

   * overall

   * design

File: enscript.info,  Node: Invoking Enscript,  Next: Basic Printing,  Prev: Introduction,  Up: Top

Invoking Enscript
*****************

File: enscript.info,  Node: Basic Printing,  Next: Advanced Usage,  Prev: Invoking Enscript,  Up: Top

Basic Printing
**************

* Menu:

* Input Encodings::
* Selecting Fonts::
* Page Headers::
* Page Handling::
* Highlighting::

File: enscript.info,  Node: Input Encodings,  Next: Selecting Fonts,  Prev: Basic Printing,  Up: Basic Printing

Input Encodings
===============

File: enscript.info,  Node: Selecting Fonts,  Next: Page Headers,  Prev: Input Encodings,  Up: Basic Printing

Selecting Fonts
===============

File: enscript.info,  Node: Page Headers,  Next: Page Handling,  Prev: Selecting Fonts,  Up: Basic Printing

Page Headers
============

File: enscript.info,  Node: Page Handling,  Next: Highlighting,  Prev: Page Headers,  Up: Basic Printing

Page Handling
=============

* Menu:

* Page Orientation::
* N-up Printing::
* Fitting Text to Page::

File: enscript.info,  Node: Page Orientation,  Next: N-up Printing,  Prev: Page Handling,  Up: Page Handling

Page Orientation
----------------

File: enscript.info,  Node: N-up Printing,  Next: Fitting Text to Page,  Prev: Page Orientation,  Up: Page Handling

N-up Printing
-------------

File: enscript.info,  Node: Fitting Text to Page,  Prev: N-up Printing,  Up: Page Handling

Fitting Text to Page
--------------------

File: enscript.info,  Node: Highlighting,  Prev: Page Handling,  Up: Basic Printing

Highlighting
============

* Menu:

* Different Output Languages::

File: enscript.info,  Node: Different Output Languages,  Prev: Highlighting,  Up: Highlighting

Different Output Languages
--------------------------

File: enscript.info,  Node: Advanced Usage,  Next: Configuration Files,  Prev: Basic Printing,  Up: Top

Advanced Usage
**************

* Menu:

* Selecting Pages::
* Escape Sequences::
* Input Filters::
* Slice Printing::
* PostScript Printer Controlling::
* Pass-Through Mode::

File: enscript.info,  Node: Selecting Pages,  Next: Escape Sequences,  Prev: Advanced Usage,  Up: Advanced Usage

Selecting Pages
===============

File: enscript.info,  Node: Escape Sequences,  Next: Input Filters,  Prev: Selecting Pages,  Up: Advanced Usage

Escape Sequences
================

File: enscript.info,  Node: Input Filters,  Next: Slice Printing,  Prev: Escape Sequences,  Up: Advanced Usage

Input Filters
=============

File: enscript.info,  Node: Slice Printing,  Next: PostScript Printer Controlling,  Prev: Input Filters,  Up: Advanced Usage

Slice Printing
==============

File: enscript.info,  Node: PostScript Printer Controlling,  Next: Pass-Through Mode,  Prev: Slice Printing,  Up: Advanced Usage

PostScript Printer Controlling
==============================

File: enscript.info,  Node: Pass-Through Mode,  Prev: PostScript Printer Controlling,  Up: Advanced Usage

Pass-Through Mode
=================

File: enscript.info,  Node: Configuration Files,  Next: Customization,  Prev: Advanced Usage,  Up: Top

Configuration Files
*******************

File: enscript.info,  Node: Customization,  Next: The states Program,  Prev: Configuration Files,  Up: Top

Customization
*************

* Menu:

* Output Media::
* User-Defined Fancy Headers::

File: enscript.info,  Node: Output Media,  Next: User-Defined Fancy Headers,  Prev: Customization,  Up: Customization

Output Media
============

File: enscript.info,  Node: User-Defined Fancy Headers,  Prev: Output Media,  Up: Customization

User-Defined Fancy Headers
==========================

File: enscript.info,  Node: The states Program,  Next: Writing New Highlighting Definitions,  Prev: Customization,  Up: Top

The `states' Program
********************

File: enscript.info,  Node: Writing New Highlighting Definitions,  Next: Index,  Prev: The states Program,  Up: Top

Writing New Highlighting Definitions
************************************

   The highlighting works in three separate phases.  First, the
"highlighing rules" process the input stream and parse it into logical
components.  The components are called "faces".  A face presents one
logical component of the input language, for example, a keyword, a
comment, etc..  The enscript's highlighting model defines the following
faces:

bold
italic
bold_italic
     Hard-coded faces for the bold, italic, and bold-italice text types.
     These faces define the exact presentation of the face font, so the
     style files have very little power in customizing their outlook.
     These faces should be avoided as much as possible.

comment
     A comment, normally in a programming language.

function_name
     A function name.  The function names are normally recognized from
     function definitions, not from an use of the function.

variable_name
     A variable name.  The variable names are normally recognized from
     function, type, and variable definitions.

keyword
     A reserved keyword.  Normally, all occurrences of the keywords are
     recognized.

reference
     A reference to another location in a file or to another file or
     resource.  For example, in the C-language, the goto targets are
     references.

string
     A string literal.

builtin
     A builtin function or property.  Normally, all occurrences of the
     builtins are recognized.

type
     A type specifier.  The types are normally recognized from function,
     type, and variable definitions.

   As the second step, the "output style" specifies how the faces are
presented in the generated output.  Each face has the following
properties:

fontname
     The PostScript font name of the the font that is used for the face.
     This property is used only for the PostScript outputs.

boldp
     A boolean flag which tells whether the face should be printed in
     bold font.  This property is used for all output languages except
     for the PostScript which uses the fontname property.

italicp
     A boolean flag which tells whether the face shuold be printed with
     italic font.  This property is used for all output languages
     except for the PostScript which uses the fontname property.

fg_color
     The foreground color of the face.

bg_color
     The background color of the face.  This property is not
     implemented on all output languages.

   Finally, the "output language" describes how the faces and other
text are presented in the output language.  The output language defines
a set of functions which are called to generate the output.

* Menu:

* Highlighting Rules::
* Styles::
* Output Languages::

File: enscript.info,  Node: Highlighting Rules,  Next: Styles,  Prev: Writing New Highlighting Definitions,  Up: Writing New Highlighting Definitions

Highlighting Rules
==================

File: enscript.info,  Node: Styles,  Next: Output Languages,  Prev: Highlighting Rules,  Up: Writing New Highlighting Definitions

Styles
======

File: enscript.info,  Node: Output Languages,  Prev: Styles,  Up: Writing New Highlighting Definitions

Output Languages
================

 - Function: map_color (r, g, b)

 - Function: language_print (string)

 - Function: language_symbol (symbol)

 - Function: header ()

 - Function: trailer ()

 - Function: face_on (face)

 - Function: face_off (face)

 - Variable: LANGUAGE_SPECIALS

   The following example creates a new output language `simple_html'
that creates simple HTML outputs.  The output language is defined in a
file called `lang_simple_html.st'.  The file must define a state called
`lang_simple_html'.  The file can be located in any directory that is
in the load path of the states program.

   The output language definitions are defined in the `BEGIN' block of
the `lang_simple_html' state.  Please, note that the `BEGIN' block is
ended with a `return'-statement.  This statement will return the
control to the calling state that is the start state of the enscript
highlight program.  If the `return'-statement was omitted, the states
would start processing the input with the `lang_simple_html' state
which is obviously a wrong choice.

     state lang_simple_html
     {
       BEGIN {
         sub map_color (r, g, b)
         {
           return sprintf ("#%02X%02X%02X", r, g, b);
         }

         sub language_print (str)
         {
           str = regsuball (str, /\&/, "&");
           str = regsuball (str, /</, "&lt;");
           str = regsuball (str, />/, "&gt;");
           str = regsuball (str, /\"/, "&quot;");
           print (str);
         }

         sub language_symbol (symbol)
         {
           return false;
         }

         sub header ()
         {
           print ("<html>\n<head>\n<title>Simple HTML Output</title>\n");
           print ("</head>\n<body>\n");
         }

         sub trailer ()
         {
           print ("</body>\n</html>\n");
         }

         sub fase_on (face)
         {
           if (face(boldp])
             print ("<B>");
           if (face(italicp])
             print ("<I>");
           if (face[fg_color])
             print ("<FONT COLOR=\", face[fg_color], "\">");
         }

         sub face_off (face)
         {
           if (face[fg_color])
             print ("</FONT>");
           if (face[italicp])
             print ("</I>");
           if (face[boldp])
             print ("</B>");
         }

         LANGUAGE_SPECIALS = /[<>\&\"]/;

         return;
       }
     }

File: enscript.info,  Node: Index,  Prev: Writing New Highlighting Definitions,  Up: Top

Index
*****

* Menu:

* face_off:                              Output Languages.
* face_on:                               Output Languages.
* header:                                Output Languages.
* language_print:                        Output Languages.
* LANGUAGE_SPECIALS:                     Output Languages.
* language_symbol:                       Output Languages.
* map_color:                             Output Languages.
* trailer:                               Output Languages.



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