\input texinfo
@comment %**start of header
@setfilename ../../info/htmlfontify.info
@settitle Htmlfontify User Manual
@include docstyle.texi
@exampleindent 2
@comment %**end of header

@copying
This manual documents Htmlfontify, a source code -> crosslinked +
formatted + syntax colorized html transformer.

Copyright @copyright{} 2002--2025 Free Software Foundation, Inc.

@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with the Front-Cover Texts being ``A GNU Manual,''
and with the Back-Cover Texts as in (a) below.  A copy of the license
is included in the section entitled ``GNU Free Documentation License''.

(a) The FSF's Back-Cover Text is: ``You have the freedom to copy and
modify this GNU manual.''
@end quotation
@end copying

@dircategory Emacs misc features
@direntry
* Htmlfontify: (htmlfontify).   Convert source code to html.
@end direntry

@titlepage
@title Htmlfontify User Manual
@sp 4
@subtitle Htmlfontify version 0.21
@sp 1
@subtitle Jun 2002
@sp 5
@author Vivek Dasmohapatra
@page

@vskip 0pt plus 1filll
@noindent
@insertcopying
@end titlepage

@contents

@ifnottex
@node Top
@top Htmlfontify

@insertcopying
@end ifnottex

@menu
* Introduction::                   About Htmlfontify.
* Usage & Examples::               How to use Htmlfontify.
* Customization::                  Fine-tuning Htmlfontify's behavior.
* Requirements::                   External programs used by Htmlfontify.
* GNU Free Documentation License:: The license for this documentation.
* Index::                          Index of contents.
@end menu

@node Introduction
@chapter Introduction
@cindex Introduction

Htmlfontify provides a means of converting individual Emacs buffers,
source files, or entire source trees to html, preserving formatting
and Emacs colorization / syntax highlighting as much as possible
through careful application of CSS stylesheets and html tags.

It can also turn instances of functions, methods and (for some
languages) variables and other constructs and items into links
to their definitions, and create an index file (or files) of
all such symbols, also linked to their points of definition.

Htmlfontify also provides several customization items, which should
allow it to mesh more-or-less seamlessly with various templating or
publishing systems (in the event, for instance, that you don't want
to produce the html pages directly).

@node Usage & Examples
@chapter Usage & Examples
@cindex Usage & Examples

Htmlfontify can be used both interactively and as part of another
elisp function.  If you're running it in a modern Emacs, it will also
run when attached to a terminal (i.e., without X) or even when in
batch mode.

@menu
* Interactive::               Using Htmlfontify interactively.
* Non-interactive::           Using Htmlfontify from elisp.
* Variables::                 Variables (other than customization entries).
* Data Structures::           Important data structures.
* Examples::                  Example(s) of Htmlfontify in use.
@end menu

@node Interactive
@section Interactive
@cindex Interactive
@cindex functions (interactive)

Htmlfontify provides the following interactive functions:

@table @code
@item htmlfontify-buffer
@findex htmlfontify-buffer
@anchor{htmlfontify-buffer}

@lisp

(htmlfontify-buffer &optional @var{srcdir} @var{file})
@end lisp

Create a new buffer, named for the current buffer + a .html extension,
containing an inline CSS-stylesheet and formatted CSS-markup html that
reproduces the look of the current Emacs buffer as closely as possible.

``Dangerous'' characters in the existing buffer are turned into html
entities, so you should even be able to do html-within-html fontified
display.

You should, however, note that random control or non-ASCII characters
such as ^L (U+000C FORM FEED (FF)) or ¤ (U+00A4 CURRENCY SIGN) won't
get mapped yet.

If the @var{srcdir} and @var{file} arguments are set, lookup etags
derived entries in the @ref{hfy-tags-cache} and add html anchors
and hyperlinks as appropriate.

@item htmlfontify-run-etags
@findex htmlfontify-run-etags
@anchor{htmlfontify-run-etags}

@lisp

(htmlfontify-run-etags @var{srcdir})
@end lisp

Load the etags cache for @var{srcdir}.  @xref{hfy-load-tags-cache}.

@item htmlfontify-copy-and-link-dir
@findex htmlfontify-copy-and-link-dir
@anchor{htmlfontify-copy-and-link-dir}

@lisp

(htmlfontify-copy-and-link-dir @var{srcdir} @var{dstdir} &optional @var{f-ext} @var{l-ext})
@end lisp

Trawl @var{srcdir} and write fontified-and-hyperlinked output in
@var{dstdir}.  @var{f-ext} and @var{l-ext} specify values for
@ref{hfy-extn} and @ref{hfy-link-extn}.

You may also want to set @ref{hfy-page-header} and @ref{hfy-page-footer}.

@item htmlfontify-load-rgb-file
@findex htmlfontify-load-rgb-file
@anchor{htmlfontify-load-rgb-file}

@lisp

(htmlfontify-load-rgb-file &optional @var{file})
@end lisp

Load an X11 style rgb.txt file (search @code{hfy-rgb-load-path} if
@var{file} is not specified).

Note that this is not necessary if all you want is the standard X11
(XFree86 4.1.0) color name -> rgb triplet mapping.  Htmlfontify has
a copy built in, for use when it cannot contact an X server.

Loads the variable @code{hfy-rgb-txt-color-map}, which is used by
@ref{hfy-fallback-color-values}.

@item htmlfontify-unload-rgb-file
@findex htmlfontify-unload-rgb-file
@anchor{htmlfontify-unload-rgb-file}

@lisp

(htmlfontify-unload-rgb-file)
@end lisp

Unload the currently loaded X11 style rgb.txt file (if any).
@end table

@node Non-interactive
@section Non-interactive
@cindex Noninteractive
@cindex functions (noninteractive)

In addition to the aforementioned interactive methods, Htmlfontify
provides the following non-interactive ones:

@table @code
@comment  AUTOGENERATED BLOCK

@item hfy-face-to-style
@findex hfy-face-to-style
@anchor{hfy-face-to-style}

@lisp

(hfy-face-to-style @var{fn})
@end lisp

Take @var{fn}, a font or @code{defface} style font specification,
(as returned by @code{face-attr-construct} or @ref{hfy-face-attr-for-class})
and return a @ref{hfy-style-assoc}.

See also: @ref{hfy-face-to-style-i}, @ref{hfy-flatten-style}.

@item hfy-fallback-color-values
@findex hfy-fallback-color-values
@anchor{hfy-fallback-color-values}

@lisp

(hfy-fallback-color-values @var{color-string})
@end lisp

Use a fallback method for obtaining the rgb values for a color.
If @ref{htmlfontify-load-rgb-file} has been called, it uses the
color map specified, otherwise it uses Htmlfontify's built in map.

@item hfy-combined-face-spec
@findex hfy-combined-face-spec
@anchor{hfy-combined-face-spec}

@lisp

(hfy-combined-face-spec @var{face})
@end lisp

Return a @code{defface} style alist of possible specifications for
@var{face}, with any entries resulting from user customization
(@code{custom-set-faces}) taking precedence.

See also: @ref{hfy-default-face-def}

@item hfy-word-regex
@findex hfy-word-regex
@anchor{hfy-word-regex}

@lisp

(hfy-word-regex @var{string})
@end lisp

Return a regex that matches @var{string} as the first @code{match-string},
with non word characters on either side (vaguely emulating the perl @code{\b}
regex atom).

@item hfy-force-fontification
@findex hfy-force-fontification
@anchor{hfy-force-fontification}

@lisp

(hfy-force-fontification)
@end lisp

Emacs's fontification is designed for interactive use.  As such, it sometimes
does things like deferring fontification until a section of the buffer is
exposed and rendered, or until Emacs is idle for a while.  Sometimes, in
non-interactive circumstances, or if it can't see X, it doesn't bother
with some of the harder stuff.  While this is all great from the perspective
of a user waiting for Emacs to load a 20000 line file and colorize it,
it's a pain from the point of view from non-interactive code.  This function
lies, cheats, steals and generally bullies Emacs into fontifying a buffer
from start to finish, with all the extra frills, whether it thinks it needs
to or not.  Oh yes: it operates on the current buffer.

@item hfy-link-style-string
@findex hfy-link-style-string
@anchor{hfy-link-style-string}

@lisp

(hfy-link-style-string @var{style-string})
@end lisp

Replace the end of a CSS style declaration @var{style-string} with the contents
of the variable @ref{hfy-src-doc-link-style}, removing text matching the
regex @ref{hfy-src-doc-link-unstyle} first, if necessary.


@item hfy-prepare-index-i
@findex hfy-prepare-index-i
@anchor{hfy-prepare-index-i}

@lisp

(hfy-prepare-index-i @var{srcdir} @var{dstdir} @var{filename} &optional @var{stub} @var{map})
@end lisp

Prepare a tags index buffer for @var{srcdir}.
@ref{hfy-tags-cache} must already have an entry for @var{srcdir} for
this to work.  @ref{hfy-page-header}, @ref{hfy-page-footer},
@ref{hfy-link-extn} and @ref{hfy-extn} all play a part here.

If @var{stub} is set, prepare an (appropriately named) index buffer
specifically for entries beginning with @var{stub}.

If @var{map} is set, use that instead of @ref{hfy-tags-cache}.

@item hfy-compile-stylesheet
@findex hfy-compile-stylesheet
@anchor{hfy-compile-stylesheet}

@lisp

(hfy-compile-stylesheet)
@end lisp

Trawl the current buffer, construct and return a @ref{hfy-sheet-assoc}.

@item hfy-css-name
@findex hfy-css-name
@anchor{hfy-css-name}

@lisp

(hfy-css-name @var{fn})
@end lisp

Strip some of the boring bits from a font-name and return a CSS style
name.  If @var{fn} is a @code{defface} attribute list, either construct
a name for it, store it in the cache, and return it, or just fetch it
from the cache if it's already there.

@item hfy-make-directory
@findex hfy-make-directory
@anchor{hfy-make-directory}

@lisp

(hfy-make-directory @var{dir})
@end lisp

Approximate equivalent of @code{mkdir -p @var{dir}}.

@item hfy-triplet
@findex hfy-triplet
@anchor{hfy-triplet}

@lisp

(hfy-triplet @var{color})
@end lisp

Takes a color name (string) and return a CSS rgb(R, G, B) triplet string.
Uses the definition of ``white'' to map the numbers to the 0-255 range, so
if you've redefined white, (especially if you've redefined it to have
a triplet member lower than that of the color you are processing,
strange things may happen).

@item hfy-default-footer
@findex hfy-default-footer
@anchor{hfy-default-footer}

@lisp

(hfy-default-footer @var{file})
@end lisp

Default value for @ref{hfy-page-footer}

@item hfy-list-files
@findex hfy-list-files
@anchor{hfy-list-files}

@lisp

(hfy-list-files @var{directory})
@end lisp

Return a list of files under @var{directory}.
Strips any leading @samp{./} from each filename.

@item hfy-color-vals
@findex hfy-color-vals
@anchor{hfy-color-vals}

@lisp

(hfy-color-vals @var{color})
@end lisp

Where @var{color} is a color name or #XXXXXX style triplet, return a list of
3 (16 bit) rgb values for said color.  If a window system is unavailable,
calls @ref{hfy-fallback-color-values}.

@item hfy-href-stub
@findex hfy-href-stub
@anchor{hfy-href-stub}

@lisp

(hfy-href-stub @var{this-file} @var{def-files} @var{tag})
@end lisp

Return an href stub for a tag href: if @var{def-files} (list of files
containing definitions for the tag in question) contains only one entry,
the href should link straight to that file.  Otherwise, the link should
be to the index file.

We are not yet concerned with the file extensions/tag line number and
so on at this point.

If @ref{hfy-split-index} is set, and the href will be to an index file
rather than a source file, append a @samp{.X} to @ref{hfy-index-file}, where
@samp{X} is the uppercased first character of @var{tag}.

See also: @ref{hfy-relstub}, @ref{hfy-index-file}.

@item hfy-line-number
@findex hfy-line-number
@anchor{hfy-line-number}

@lisp

(hfy-line-number)
@end lisp

Returns the line number of the point in the current buffer.

@item hfy-merge-adjacent-spans
@findex hfy-merge-adjacent-spans
@anchor{hfy-merge-adjacent-spans}

@lisp

(hfy-merge-adjacent-spans @var{face-map})
@end lisp

Where @var{face-map} is a @ref{hfy-facemap-assoc} for the current buffer,
this function merges adjacent style blocks which are of the same value
and are separated by nothing more interesting than whitespace.

@code{<span class="foo">narf</span> <span class="foo">brain</span>}

(as interpreted from @var{face-map}) would become:

@code{<span class="foo">narf brain</span>}

Returns a modified copy of @var{face-map} (also a @ref{hfy-facemap-assoc}).

@item hfy-mark-tag-names
@findex hfy-mark-tag-names
@anchor{hfy-mark-tag-names}

@lisp

(hfy-mark-tag-names @var{srcdir} @var{file})
@end lisp

Mark tags in @var{file} (lookup @var{srcdir} in @ref{hfy-tags-cache}) with the
@code{hfy-anchor} property, with a value of @samp{tag.line-number}.

@item hfy-weight
@findex hfy-weight
@anchor{hfy-weight}

@lisp

(hfy-weight @var{weight})
@end lisp

Derive a font-weight CSS specifier from an Emacs weight specification symbol.

@item hfy-size
@findex hfy-size
@anchor{hfy-size}

@lisp

(hfy-size @var{height})
@end lisp

Derive a CSS font-size specifier from an Emacs font @code{:height} attribute.
Does not cope with the case where height is a function to be applied to
the height of the underlying font.

@item hfy-default-header
@findex hfy-default-header
@anchor{hfy-default-header}

@lisp

(hfy-default-header @var{file} @var{style})
@end lisp

Default value for @ref{hfy-page-header}

@item hfy-family
@findex hfy-family
@anchor{hfy-family}

@lisp

(hfy-family @var{family})
@end lisp

Derives a CSS font-family specifier from an Emacs @code{:family} attribute.

@item hfy-mark-tag-hrefs
@findex hfy-mark-tag-hrefs
@anchor{hfy-mark-tag-hrefs}

@lisp

(hfy-mark-tag-hrefs @var{srcdir} @var{file})
@end lisp

Mark href start points with the @code{hfy-link} property (value: href string).

Mark href end points with the @code{hfy-endl} property (value @code{t}).

Avoid overlapping links, and mark links in descending length of
tag name in order to prevent subtags from usurping supertags;
e.g., ``term'' for ``terminal'').

@item hfy-box
@findex hfy-box
@anchor{hfy-box}

@lisp

(hfy-box @var{box})
@end lisp

Derive CSS border-* attributes from the Emacs @code{:box} attribute.

@item hfy-box-to-style
@findex hfy-box-to-style
@anchor{hfy-box-to-style}

@lisp

(hfy-box-to-style @var{spec})
@end lisp

Convert a complex @code{:box} Emacs font attribute set to a list of
CSS border-* attributes.  Don't call this directly---it is called by
@ref{hfy-box} when necessary.

@item hfy-html-enkludge-buffer
@findex hfy-html-enkludge-buffer
@anchor{hfy-html-enkludge-buffer}

@lisp

(hfy-html-enkludge-buffer)
@end lisp

Mark dangerous @samp{["<>]} characters with the @code{hfy-quoteme} property.

See also @ref{hfy-html-dekludge-buffer}.

@item hfy-buffer
@findex hfy-buffer
@anchor{hfy-buffer}

@lisp

(hfy-buffer)
@end lisp

Generate and return an Htmlfontify html output buffer for the current
buffer.  May trample an existing buffer.

@item hfy-fontified-p
@findex hfy-fontified-p
@anchor{hfy-fontified-p}

@lisp

(hfy-fontified-p)
@end lisp

@code{font-lock} doesn't like to say a buffer's been fontified when in
batch mode, but we want to know if we should fontify or raw copy, so in
batch mode we check for non-default face properties.  Otherwise we test
@code{font-lock-mode} and @code{font-lock-fontified} for truth.

@item hfy-lookup
@findex hfy-lookup
@anchor{hfy-lookup}

@lisp

(hfy-lookup @var{face} @var{style})
@end lisp

Where @var{style} is a @ref{hfy-sheet-assoc} and @var{face} is an Emacs face,
return the relevant @var{css} style name.

@item hfy-fontify-buffer
@findex hfy-fontify-buffer
@anchor{hfy-fontify-buffer}

@lisp

(hfy-fontify-buffer &optional @var{srcdir} @var{file})
@end lisp

Implement the guts of @ref{htmlfontify-buffer}.

@item hfy-color
@findex hfy-color
@anchor{hfy-color}

@lisp

(hfy-color @var{color})
@end lisp

Convert an Emacs :foreground property to a CSS color property.

@item hfy-flatten-style
@findex hfy-flatten-style
@anchor{hfy-flatten-style}

@lisp

(hfy-flatten-style @var{style})
@end lisp

Take @var{style} (@pxref{hfy-face-to-style-i}, @pxref{hfy-face-to-style})
and merge any multiple attributes appropriately.  Currently only font-size is
merged down to a single occurrence---others may need special handling, but I
haven't encountered them yet.  Returns a @ref{hfy-style-assoc}.

@item hfy-size-to-int
@findex hfy-size-to-int
@anchor{hfy-size-to-int}

@lisp

(hfy-size-to-int @var{spec})
@end lisp

Convert @var{spec}, a CSS font-size specifier, back to an Emacs
@code{:height} attribute value.  Used while merging multiple font-size
attributes.

@item hfy-sprintf-stylesheet
@findex hfy-sprintf-stylesheet
@anchor{hfy-sprintf-stylesheet}

@lisp

(hfy-sprintf-stylesheet @var{css} @var{file})
@end lisp

Generates a header, via @ref{hfy-page-header}, for @var{file}, containing the
stylesheet derived from @var{css}, which is a @ref{hfy-sheet-assoc}.  Returns a
string containing the same.

@item hfy-relstub
@findex hfy-relstub
@anchor{hfy-relstub}

@lisp

(hfy-relstub @var{file} &optional @var{start})
@end lisp

Return a @samp{../} stub of the appropriate length for the current source
tree depth (as determined from @var{file}). @c iyswim.

@item hfy-compile-face-map
@findex hfy-compile-face-map
@anchor{hfy-compile-face-map}

@lisp

(hfy-compile-face-map)
@end lisp

Compile and return a @ref{hfy-facemap-assoc} for the current buffer.

@item hfy-prepare-index
@findex hfy-prepare-index
@anchor{hfy-prepare-index}

@lisp

(hfy-prepare-index @var{srcdir} @var{dstdir})
@end lisp

Return as list of index buffer(s), as determined by @ref{hfy-split-index}.
Uses @ref{hfy-prepare-index-i} to do this.

@item hfy-prepare-tag-map
@findex hfy-prepare-tag-map
@anchor{hfy-prepare-tag-map}

@lisp

(hfy-prepare-tag-map @var{srcdir} @var{dstdir})
@end lisp

Prepare the counterpart(s) to the index buffer(s)---a list of buffers with
the same structure, but listing (and linking to) instances of tags (as
opposed to their definitions).

See also: @ref{hfy-prepare-index}, @ref{hfy-split-index}

@item hfy-subtract-maps
@findex hfy-subtract-maps
@anchor{hfy-subtract-maps}

@lisp

(hfy-subtract-maps @var{srcdir})
@end lisp

Internal function---strips definitions of tags from the instance map.
See: @ref{hfy-tags-cache} and @ref{hfy-tags-rmap}

@item hfy-face-to-style-i
@findex hfy-face-to-style-i
@anchor{hfy-face-to-style-i}

@lisp

(hfy-face-to-style-i @var{fn})
@end lisp

The guts of @ref{hfy-face-to-style}.  @var{fn} should be a @code{defface}
font specification, as returned by @code{face-attr-construct} or
@ref{hfy-face-attr-for-class}.  Note that this function does not get
font-sizes right if they are based on inherited modifiers (via the
:inherit) attribute, and any other modifiers that are cumulative if they
appear multiple times need to be merged by the user---@ref{hfy-flatten-style}
should do this.

@item hfy-face-to-css
@findex hfy-face-to-css
@anchor{hfy-face-to-css}

@lisp

(hfy-face-to-css @var{fn})
@end lisp

Take @var{fn}, a font or @code{defface} specification (cf.
@code{face-attr-construct}) and return a CSS style specification.

See also: @ref{hfy-face-to-style}

@item hfy-html-quote
@findex hfy-html-quote
@anchor{hfy-html-quote}

@lisp

(hfy-html-quote @var{char-string})
@end lisp

Map a string (usually 1 character long) to an html safe string
(entity) if need be.

@item hfy-link-style
@findex hfy-link-style
@anchor{hfy-link-style}

@lisp

(hfy-link-style @var{style-string})
@end lisp

Convert the CSS style spec @var{style-string} to its equivalent
hyperlink style.

See: @ref{hfy-link-style-fun}.

@item hfy-p-to-face
@findex hfy-p-to-face
@anchor{hfy-p-to-face}

@lisp

(hfy-p-to-face @var{props})
@end lisp

Given @var{props}, a list of text-properties, return the value of the
face property, or @code{nil}.

@item hfy-box-to-border-assoc
@findex hfy-box-to-border-assoc
@anchor{hfy-box-to-border-assoc}

@lisp

(hfy-box-to-border-assoc @var{spec})
@end lisp

Helper function for @ref{hfy-box-to-style}.

@item hfy-face-attr-for-class
@findex hfy-face-attr-for-class
@anchor{hfy-face-attr-for-class}

@lisp

(hfy-face-attr-for-class @var{face} &optional @var{class})
@end lisp

Return the face attributes for @var{face}.  If @var{class} is set, it
must be a @code{defface} alist key [see below].  Prior to version 0.18,
the first face specification returned by @ref{hfy-combined-face-spec}
which @emph{didn't} clash with @var{class} was returned.  In versions
from 0.18 onwards, each font attribute list is scored, and the
non-conflicting list with the highest score is returned.  (A specification
with a class of @code{t} is considered to match any class you specify.
This matches Emacs's behavior when deciding on which face attributes to
use, to the best of my understanding ).

If @var{class} is @code{nil}, then you just get whatever
@code{face-attr-construct} returns; i.e., the current specification in
effect for @var{face}.

@xref{hfy-display-class}, for details of valid values for @var{class}.

@item hfy-face-at
@findex hfy-face-at
@anchor{hfy-face-at}

@lisp

(hfy-face-at P)
@end lisp

Find face in effect at point P@.  If overlays are to be considered
(@pxref{hfy-optimizations}) then this may return a @code{defface} style
list of face properties instead of a face symbol.

@item hfy-bgcol
@findex hfy-bgcol
@anchor{hfy-bgcol}

@lisp

(hfy-bgcol @var{color})
@end lisp

As per @ref{hfy-color} but for background colors.

@item hfy-kludge-cperl-mode
@findex hfy-kludge-cperl-mode
@anchor{hfy-kludge-cperl-mode}

@lisp

(hfy-kludge-cperl-mode)
@end lisp

cperl mode does its best to not do some of its fontification when not
in a windowing system---we try to trick it@dots{}

@item hfy-href
@findex hfy-href
@anchor{hfy-href}

@lisp

(hfy-href @var{this-file} @var{def-files} @var{tag} @var{tag-map})
@end lisp

Return a relative href to the tag in question, based on

@var{this-file} @ref{hfy-link-extn} @ref{hfy-extn} @var{def-files} @var{tag} and @var{tag-map}

@var{this-file} is the current source file
@var{def-files} is a list of file containing possible link endpoints for @var{tag}
@var{tag} is the @var{tag} in question
@var{tag-map} is the entry in @ref{hfy-tags-cache}.

@item hfy-shell
@findex hfy-shell
@anchor{hfy-shell}

@lisp

(hfy-shell)
@end lisp

Returns a best guess at a Bourne compatible shell to use: If the current
shell doesn't look promising, fall back to @ref{hfy-shell-file-name}.

@item hfy-load-tags-cache
@findex hfy-load-tags-cache
@anchor{hfy-load-tags-cache}

@lisp

(hfy-load-tags-cache @var{srcdir})
@end lisp

Run @ref{hfy-etags-cmd} on @var{srcdir}: load @ref{hfy-tags-cache} and @ref{hfy-tags-sortl}.

@item hfy-parse-tags-buffer
@findex hfy-parse-tags-buffer
@anchor{hfy-parse-tags-buffer}

@lisp

(hfy-parse-tags-buffer @var{srcdir} @var{buffer})
@end lisp

Parse a @var{buffer} containing etags formatted output, loading the
@ref{hfy-tags-cache} and @ref{hfy-tags-sortl} entries for @var{srcdir}.

@item hfy-interq
@findex hfy-interq
@anchor{hfy-interq}

@lisp

(hfy-interq @var{set-a} @var{set-b})
@end lisp

Return the intersection (using @code{eq}) of 2 lists.

@item hfy-text-p
@findex hfy-text-p
@anchor{hfy-text-p}

@lisp

(hfy-text-p @var{srcdir} @var{file})
@end lisp

Is @var{srcdir}/@var{file} text?  Uses @ref{hfy-istext-command} to determine this.

@item hfy-opt
@findex hfy-opt
@anchor{hfy-opt}

@lisp

(hfy-opt @var{symbol})
@end lisp

Is @ref{hfy-optimizations} member @var{symbol} set or not?

@item hfy-dirname
@findex hfy-dirname
@anchor{hfy-dirname}

@lisp

(hfy-dirname @var{file})
@end lisp

Return everything preceding the last @samp{/} from a relative filename,
on the assumption that this will produce the name of a relative
directory.  Hardly bombproof, but good enough in the context in which
it is being used.

@item hfy-html-dekludge-buffer
@findex hfy-html-dekludge-buffer
@anchor{hfy-html-dekludge-buffer}

@lisp

(hfy-html-dekludge-buffer)
@end lisp

Transform all dangerous characters marked with the @code{hfy-quoteme} property
using @ref{hfy-html-quote}

See also @ref{hfy-html-enkludge-buffer}.

@item hfy-copy-and-fontify-file
@findex hfy-copy-and-fontify-file
@anchor{hfy-copy-and-fontify-file}

@lisp

(hfy-copy-and-fontify-file @var{srcdir} @var{dstdir} @var{file})
@end lisp

Open @var{file} in @var{srcdir}---if fontified, write a fontified copy to @var{dstdir}
adding an extension of @ref{hfy-extn}.  Fontification is actually done by
@ref{htmlfontify-buffer}.  If the buffer is not fontified, just copy it.

@item hfy-decor
@findex hfy-decor
@anchor{hfy-decor}

@lisp

(hfy-decor @var{tag} @var{val})
@end lisp

Derive CSS text-decoration specifiers from various Emacs font attributes.

@item hfy-slant
@findex hfy-slant
@anchor{hfy-slant}

@lisp

(hfy-slant @var{slant})
@end lisp

Derive a font-style CSS specifier from the Emacs :slant
attribute---CSS does not define the reverse-* styles, so just maps
those to the regular specifiers.

@item hfy-tags-for-file
@findex hfy-tags-for-file
@anchor{hfy-tags-for-file}

@lisp

(hfy-tags-for-file @var{srcdir} @var{file})
@end lisp

List of etags tags that have definitions in this @var{file}.  Looks up
the tags cache in @ref{hfy-tags-cache} using @var{srcdir} as the key.

@item hfy-width
@findex hfy-width
@anchor{hfy-width}

@lisp

(hfy-width @var{width})
@end lisp

Convert an Emacs @code{:width} attribute to a CSS font-stretch attribute.

@comment /AUTOGENERATED BLOCK
@end table

@node Variables
@section Variables
@cindex variables

Important variables that are not customization items:

@table @code

@item hfy-tags-cache
@vindex hfy-tags-cache
@anchor{hfy-tags-cache}

This is an alist of the form:

@example
(("/src/dir/0" . tag-hash0) ("/src/dir/1" tag-hash1) @dots{} )
@end example

Each tag hash entry then contains entries of the form:

@example
"tag_string" => (("file/name.ext" line char) @dots{} )
@end example

i.e., an alist mapping (relative) file paths to line and character offsets.

@xref{hfy-load-tags-cache}.

@item hfy-tags-rmap
@vindex hfy-tags-rmap
@anchor{hfy-tags-rmap}

@code{hfy-tags-rmap} is an alist of the form:

@lisp
(("/src/dir" . tag-rmap-hash))
@end lisp

Where tag-rmap-hash has entries of the form:

@example
"tag_string" => ( "file/name.ext" line char )
@end example

Unlike @ref{hfy-tags-cache} these are the locations of occurrences of
tagged items, not the locations of their definitions.

@item hfy-tags-sortl
@vindex hfy-tags-sortl
@anchor{hfy-tags-sortl}

@code{hfy-tags-sortl} is an alist of the form:

@example
(("/src/dir" . (tag0 tag1 tag2)) @dots{} )
@end example

Where the tags are stored in descending order of length.

See: @ref{hfy-load-tags-cache}.

@end table

@node Data Structures
@section Data Structures
@cindex Data Structures

Some of the (informal) data structures used in Htmlfontify are detailed here:

@table @code

@item hfy-style-assoc
@cindex @code{hfy-style-assoc}
@anchor{hfy-style-assoc}

An assoc representing/describing an Emacs face.  Properties may be repeated,
in which case later properties should be treated as if they were inherited
from a ``parent'' font.  (For some properties, only the first encountered value
is of any importance, for others the values might be cumulative, and for
others they might be cumulative in a complex way.)

Some examples:

@lisp
(hfy-face-to-style 'default) =>

  (("background"      . "rgb(0, 0, 0)"      )
   ("color"           . "rgb(255, 255, 255)")
   ("font-style"      . "normal"            )
   ("font-weight"     . "500"               )
   ("font-stretch"    . "normal"            )
   ("font-family"     . "misc-fixed"        )
   ("font-size"       . "13pt"              )
   ("text-decoration" . "none"              ))

(hfy-face-to-style 'Info-title-3-face) =>

  (("font-weight"     . "700"        )
   ("font-family"     . "helv"       )
   ("font-size"       . "120%"       )
   ("text-decoration" . "none")      )
@end lisp

@item hfy-sheet-assoc
@cindex @code{hfy-sheet-assoc}
@anchor{hfy-sheet-assoc}

An assoc with elements of the form @samp{(face-name style-name . style-string)}.
The actual stylesheet for each page is derived from one of these.

@lisp
((default       "default" . "@{ background: black; color: white@}")
 (font-lock-string-face "string"  . "@{ color: rgb(64,224,208) @}"))
@end lisp

@item hfy-facemap-assoc
@cindex @code{hfy-facemap-assoc}
@anchor{hfy-facemap-assoc}

An assoc of @code{(point . @var{face-symbol})} or
@code{(point . @code{defface} attribute list)} and @code{(point
. end)} elements, in descending order of point value (i.e., from the
file's end to its beginning).  The map is in reverse order because
inserting a @samp{<style>} tag (or any other string) at @var{point}
invalidates the map for all entries with a greater value of point.  By
traversing the map from greatest to least @var{point}, we still
invalidate the map as we go, but only those points we have already
dealt with (and therefore no longer care about) will be invalid at any
time.

@lisp
((64820 . end)
 (64744 . font-lock-comment-face)
 (64736 . end)
 (64722 . font-lock-string-face)
 (64630 . end)
 (64623 . font-lock-string-face)
 (64449 . end)
 ;; Big similar section elided.  You get the idea.
 (5459 . end)
 (5431 . (:inherit font-lock-keyword-face :background "7e7e7e"))
 (5431 . end)
 (4285 . font-lock-constant-face)
 (4285 . end)
 (4221 . font-lock-comment-face)
 (4221 . end)
 (4197 . font-lock-constant-face)
 (4197 . end)
 (1 . font-lock-comment-face))
@end lisp

@end table

@node Examples
@section Examples
@cindex Examples

The following is a lump of code I use to fontify source code on my
site, @url{http://rtfm.etla.org/} (which was the reason, incidentally,
that Htmlfontify was written in the first place).

@lisp
(defvar rtfm-section nil)

;; Constructs an appropriate header string to fit in with rtfm's
;; templating system, based on the file and the stylesheet string
(defun rtfm-build-page-header (file style)
  (format "#define  TEMPLATE red+black.html
#define  DEBUG    1
#include <build/menu-dirlist|>\n
html-css-url := /css/red+black.css
title        := rtfm.etla.org ( %s / src/%s )
bodytag      :=
head         <=STYLESHEET;\n
%s
STYLESHEET
main-title   := rtfm / %s / src/%s\n
main-content <=MAIN_CONTENT;\n" rtfm-section file style rtfm-section file))

;; the footer:
(defun rtfm-build-page-footer (file) "\nMAIN_CONTENT\n")

(defun rtfm-fontify-buffer (section)
  (interactive "s section[eg- emacs / p4-blame]: ")
  (require 'htmlfontify)
  (let ((hfy-page-header  'rtfm-build-page-header)
	(hfy-page-footer  'rtfm-build-page-footer)
	(rtfm-section                     section))
    (htmlfontify-buffer)
    )
  )

;; Here's the function I actually call---it asks me for a section label,
;; and source and destination directories, and then binds a couple of
;; customization variable in a let before calling htmlfontify:
(defun rtfm-build-source-docs (section srcdir destdir)
  (interactive
   "s section[eg- emacs / p4-blame]:\nD source-dir: \nD output-dir: ")
  (require 'htmlfontify)
  (hfy-load-tags-cache srcdir)
  (let ((hfy-page-header  'rtfm-build-page-header)
	(hfy-page-footer  'rtfm-build-page-footer)
	(rtfm-section                     section)
	(hfy-index-file                   "index")
	(auto-mode-alist (append auto-mode-alist
				 '(("dbi\\(shell\\|gtk\\)$" . cperl-mode)
				   ("\\.xpm$"               . c-mode    ))))
	)
    (htmlfontify-run-etags srcdir)
    (htmlfontify-copy-and-link-dir srcdir destdir ".src" ".html")))
@end lisp

@node Customization
@chapter Customization
@cindex variables (customization)

Htmlfontify provides the following variable and customization entries:

@table @code
@comment  AUTOGENERATED BLOCK

@item hfy-link-style-fun
@vindex hfy-link-style-fun
@anchor{hfy-link-style-fun}

Set this to a function, which will be called with one argument
(a @samp{@{ foo: bar; @dots{}@}} CSS style-string)---it should return a copy of
its argument, altered so as to make any changes you want made for text which
is a hyperlink, in addition to being in the class to which that style would
normally be applied.

@item hfy-html-quote-regex
@vindex hfy-html-quote-regex
@anchor{hfy-html-quote-regex}

@c FIXME: the cross-reference below looks ugly
Regex to match (with a single back-reference per match) strings in HTML
which should be quoted with @ref{hfy-html-quote}
(and @pxref{hfy-html-quote-map}) to make them safe.

@item hfy-page-footer
@vindex hfy-page-footer
@anchor{hfy-page-footer}

As @ref{hfy-page-header}, but generates the output footer
(and takes only 1 argument, the filename).

@item hfy-display-class
@vindex hfy-display-class
@anchor{hfy-display-class}

Display class to use to determine which display class to use when
calculating a face's attributes.  This is useful when, for example, you
are running Emacs on a tty or in batch mode, and want Htmlfontify to have
access to the face spec you would use if you were connected to an X display.

Some valid class specification elements are:

@lisp
  (class      color)
  (class      grayscale)
  (background dark)
  (background light)
  (type       x-toolkit)
  (type       tty)
  (type       motif)
  (type       lucid)
@end lisp

Multiple values for a tag may be combined, to indicate that any one or more
of these values in the specification key constitutes a match.  For
example, @code{((class color grayscale) (type tty))} would match any of:

@lisp
  ((class color))
  ((class grayscale))
  ((class color grayscale)))
  ((class color foo))
  ((type  tty))
  ((type  tty) (class color))
@end lisp

@item hfy-page-header
@vindex hfy-page-header
@anchor{hfy-page-header}

Function called with two arguments (the filename relative to the top
level source directory being etagged and fontified), and a string containing
the @samp{<style>@dots{}</style>} text to embed in the document---the string
returned will be used as the header for the htmlfontified version of
the source file.

See also: @ref{hfy-page-footer}

@item hfy-src-doc-link-style
@vindex hfy-src-doc-link-style
@anchor{hfy-src-doc-link-style}

String to add to the @samp{<style> a} variant of an Htmlfontify CSS class.

@item hfy-split-index
@vindex hfy-split-index
@anchor{hfy-split-index}

Whether or not to split the index @ref{hfy-index-file} alphabetically
on the first letter of each tag.  Useful when the index would otherwise
be large and take a long time to render or be difficult to navigate.

@item hfy-exclude-file-rules
@vindex hfy-exclude-file-rules

Regular expressions to exclude files which shouldn't be fontified.

@item hfy-extn
@vindex hfy-extn
@anchor{hfy-extn}

File extension used for output files.

@item hfy-default-face-def
@vindex hfy-default-face-def
@anchor{hfy-default-face-def}

Fallback @code{defface} specification for the face @code{default}, used
when @ref{hfy-display-class} has been set (the normal Htmlfontify way of
extracting potentially non-current face information doesn't necessarily
work for @code{default}).

For example, I customize this to:

@lisp
((t :background "black" :foreground "white" :family "misc-fixed"))
@end lisp

@item hfy-init-kludge-hook
@vindex hfy-init-kludge-hook
@anchor{hfy-init-kludge-hook}

List of functions to call when starting htmlfontify-buffer to do any
kludging necessary to get highlighting modes to behave as you want, even
when not running under a window system.

@item hfy-shell-file-name
@vindex hfy-shell-file-name
@anchor{hfy-shell-file-name}

Should be set to a Bourne compatible shell, which will be invoked
for the more complex shell interactions needed by Htmlfontify.
Currently this is only required/used when using GNU etags, see
@ref{hfy-etags-cmd-alist} for details.

@item hfy-optimizations
@vindex hfy-optimizations
@anchor{hfy-optimizations}

Optimizations to turn on.  So far, the following have been implemented:

@table @option
@item merge-adjacent-tags
If two (or more) span tags are adjacent, identical and separated by nothing
more than whitespace, they will be merged into one span.

@item zap-comment-links
Suppress hyperlinking of tags found in comments.

@item zap-string-links
Suppress hyperlinking of tags found in strings.

@item div-wrapper
Add @samp{<div class="default"> </div>} tags around the fontified body.
(Some people like this because they cut and paste the html into
a page with different colors than the fontified code.)

@item keep-overlays
Preserve overlay highlighting (cf.@: @code{ediff} or @code{goo-font-lock})
as well as basic faces.  Can result in extremely verbose highlighting
if there are many overlays (as is the case with @code{goo-font-lock}).

@end table

And the following are planned but not yet available:

@table @option
@item kill-context-leak
Suppress hyperlinking between files highlighted by different modes.

@end table

Note: like compiler optimizations, these optimize the @emph{output} of
the code,
not the processing of the source itself, and are therefore likely to slow
Htmlfontify down, at least a little.  Except for skip-refontification,
which can never slow you down, but may result in incomplete fontification.

@item hfy-src-doc-link-unstyle
@vindex hfy-src-doc-link-unstyle
@anchor{hfy-src-doc-link-unstyle}

Regex to remove from the @samp{<style> a} variant of an Htmlfontify CSS class.

@item hfy-link-extn
@vindex hfy-link-extn
@anchor{hfy-link-extn}

File extension used for href links---useful where the Htmlfontify
output files are going to be processed again, with a resulting change
in file extension.  If @code{nil}, then any code using this should fall back
to @ref{hfy-extn}.

@item hfy-istext-command
@vindex hfy-istext-command
@anchor{hfy-istext-command}

Command to run with the name of a file, to see whether it is a text file
or not.  The command should emit a string containing the word @samp{text} if
the file is a text file, and a string not containing @samp{text} otherwise.

@item hfy-etags-cmd-alist
@vindex hfy-etags-cmd-alist
@anchor{hfy-etags-cmd-alist}

An alist of possible shell commands that will generate etags output that
Htmlfontify can use.  @samp{%s} will be replaced by @ref{hfy-etags-bin}.

@item hfy-etags-bin
@vindex hfy-etags-bin
@anchor{hfy-etags-bin}

The location of the etags binary (we begin by assuming it's in your path).

Note that if etags is not in your path, you will need to alter the shell
commands in @ref{hfy-etags-cmd-alist}.

[As of version 0.17, this requirement has been removed: it should
  all just work(tm).]

@item hfy-etags-cmd
@vindex hfy-etags-cmd
@anchor{hfy-etags-cmd}

An etags shell command to run in the source directory to generate a tags
file for the whole source tree from there on down.  The command should emit
the etags output on standard output.

Two canned commands are provided---they drive Emacs's etags and
exuberant-ctags's etags respectively.

@item hfy-etag-regex
@vindex hfy-etag-regex
@anchor{hfy-etag-regex}

Regex used to parse an etags entry: must have 3 subexps, corresponding,
in order, to:

@enumerate
@item
The tag
@item
The line
@item
The character (point) at which the tag occurs
@end enumerate

@item hfy-index-file
@vindex hfy-index-file
@anchor{hfy-index-file}

Name (sans extension) of the index file produced during
fontification-and-hyperlinking.

@item hfy-instance-file
@vindex hfy-instance-file
@anchor{hfy-instance-file}

Name (sans extension) of the tag usage index file produced during
fontification-and-hyperlinking.

@item hfy-html-quote-map
@vindex hfy-html-quote-map
@anchor{hfy-html-quote-map}

An alist of character -> entity mappings used to make the text html-safe.

@comment /AUTOGENERATED BLOCK
@end table

@node Requirements
@chapter Requirements
@cindex Requirements, Prerequisites

Htmlfontify has a couple of external requirements:

@itemize @bullet

@item
A copy of etags (exuberant-ctags or GNU etags).  Htmlfontify attempts
to autodetect the version you have and customize itself accordingly,
but you should be able to override this.

See: @ref{Customization}

@item
A copy of sed (e.g., GNU sed).

@item
A copy of the @code{file} command.

@end itemize

@node GNU Free Documentation License
@appendix GNU Free Documentation License
@include doclicense.texi

@node Index
@unnumbered Index

@table @var
@item Concepts
@printindex cp

@item Functions
@printindex fn

@item Variables & Customization
@printindex vr

@end table

@setchapternewpage odd
@bye

@c Local Variables:
@c coding: utf-8
@c End:
