Ubuntu Manpage: code2html - Converts a program source code to HTML

NAME

       code2html - Converts a program source code to HTML

SYNOPSIS

       (1) code2html [options] [input-file [output-file]]

       (2) code2html -p [file [alternate-outfile]]

       (3) code2html (as a CGI script; see the section on CGI)

DESCRIPTION

code2html is a perl script which converts a program source code to syntax highlighted
HTML, or any other format for wich rules are defined.

(1) OPTIONS
input-file
Is the file which contains the program source code to be formatted. If not
specified or a minus (-) is given, the code will be read from STDIN.

output-file
Is the file to write the formatted code to. If not specified or a minus (-) is
given, the code will be written to STDOUT.

-l, --language-mode
Specify the set of regular expressions to use. These have to be defined in a
language file (see FILES below). To find out which language modes are defined,
issue a code2html --modes.

This input is treated case-insensitive.

If not given, some heuristics will be used to determine the file language.

-v, --verbose
Prints progress information to STDERR.

-n, --linenumbers
Print out the source code with line numbers.

-N, --linknumbers
Print out the source code with line numbers. The linenumbers will link to
themselves, which makes it easy to send links to lines.

-P, --prefix
Optional prefix to use for line number anchors.

-t, --replace-tabs[=TABSTOP-WIDTH]
Replace each occurence of a <TAB> character with the right amount of spaces to get
to the next tabstop. Default is a tabstop width of 8 characters.

-L, --language-file=LANGUAGE-FILE
Specify an alternate file to take the language and output-format definitions from
(see the section on FILES below).

-m, --modes
Print all language modes and output-formats currently defined to STDOUT and exit
succesfully. Also prints modes from a LANGUAGE-FILE given by --language-file if
applicable.

--fallback=LANG
If the language mode given with --language-mode cannot be found then use this
mode.

--fallback plain for instance is usefull when code2html is called from a script to
ensure output is created.

-h, --help
Print a short help and exit succesfully.

-V, --version
Print the program version and exit succesfully.

-c, --content-type
Prints ”Content-Type: text/html\n\n“ (or whatever the output-format defines as a
content-type) prior to the rest of the output. Usefull if the script is ivoked as
a cgi script.

-o, --output-format
Selects the output-format. html is the default. To find out which outputformats
are defined, issue a code2html --modes.

-H, --no-header
do not make use of the template defined by the output-format. For HTML this means
that there will be no <html>, <head>, and no <typical for patch and CGI modes,pre>
tags.

--template=FILE
overrides the default template for the given output format. If --no-header is
given too, this has no meaning, since the template is ignored anyway.

-T, --title
Set the title of the produced output file. Only works if the template does
support setting the title.

-w, --linewidth=LINEWIDTH
Wrap lines after LINEWIDTH characters. Default is to not wrap lines at all.

-b, --linebreakprefix=LINEPREFIX
Use fILINEPREFIX at the start of wrapped lines. Default is "» ".

(2) HTML patching
code2html -p [file [alternate-outfile]]

code2html also allows you to have inline source code in an html file. It can then take
this html file and insert the syntax highlighted code.

If no file is given, code2html reads from STDIN and writes to STDOUT. If just one file is
given it replaces this file with the output. If two files are provided, the first one is
read from and the second one written to.

To use this feature, just insert a like like this into your html file:

the syntax highlighted file will be inserted at this position enclosed in <pre> tags.

All options that can be given on the command line like --linenumbers etc. work. --help,
--version, etc. work too however it is not very intelligent to use them :). Using
--output-format to choose a non-HTML outputformat is not adviseable. --content-type is
ignored.

You may also write the program's source code directly in the html file with the following
syntax:

<!-- code2html add [options]

-->

It is usually a good idea to at least give the --language-mode option to specify the
language.

(3) CGI
If the the script is used as a CGI script (GATEWAY_INTERFACE environment set and no
command line arguments given) code2html reads the arguments either from the query string
or from SDTIN. (methods POST and GET).

--content-type is switched on automatically and the output always goes to STDOUT.

The following parameters/options are accepted:

language-mode - optional
`c', `cc', `pas', etc.

if not given, some heuristics are used to find out the language.

fallback - optional
`plain', `c', etc. if language-mode cannot be found, use this one

input-selector - optional
either `file', `cgi-input1', `cgi-input2', or `REDIRECT_URL'

default: file

filename
file to read from if input-selector is `file'

cgi-input1
The source code to syntax highlight. For example from a <textarea> or from a
upload. See input-selector.

cgi-input2
The source code to syntax highlight. For example from a <textarea> or from a
upload. See input-selector.

line-numbers - optional
`yes', `no' or `link'

default: no

replace-tabs - optional
If 0 then tabs are not replaced, else replace each occurence of a <TAB> character
with the right amount of spaces to get to the next tabstop.

default: 0

title - optional
Set's the title of the file.

no-encoding - optional
By default code2html tries to encode the output as either bz2/gz/Z if the client
supports this (HTTP_ACCEPT_ENCODING) and the needed program is available on the
server. You may need to modify @CGI_ENCODING in the script to match your program
locations.

If no-encoding is defined as “true” code2html does not try to encode the output.

Why two cgi-inputs you may ask: This is to allow your users to choose vie a <form>
interface whether they want to insert their file into a <textarea> or user a <browse>
button to select their file. See the example on my home- page.

Note that if $FILES_DISALLOWED_IN_CGI is 0 it is possbile for your users to read all the
files the httpd can read (if you don't run a cgi- wrapper or something like this. By
default this value is set to 1, so file reading via cgi should not be allowed. You can
allow it with setting $FILES_DISALLOWED_IN_CGI to 0 at the top of the script.

The input selector REDIRECT_URL needs a special explaination. The file name is formed from
the two enviroment variables DOCUMENT_ROOT and REDIRECT_URL.

If you want apache to automatically call code2html for all program source code files you
may do this by adding these two lines to your srm.conf:

AddHandler text/x-sourcecode .c .cc .cpp .pas .h .p

Action text/x-sourcecode /cgi-bin/code2html?input-selector=REDIRECT_URL&foo=

or something similar to this. In the AddHandle line you can choose which extensions to
pass through code2html.

WARNING: Do not add .pl to this line and name this script “code2html.pl”. This will result
in a loop.

Also make sure that you load the Action module (srm.conf).

Replace /cgi-bin/code2html with the virtual location under which the file can be accessed.
Note the “foo=” part. Apache appends the URL of the file to display at the end of the
action part. We do not need this since we use the environment variable REDIRECT_URL
however we do not want to get the url addes to the input-selector string. Therefore we
append the “&foo=” part.

Tnx to Kevin Burton <burton@relativity.yi.org> for the idea. He also states that

> It is more powerfull if you use it in an Apache
> <Directory> tag
>
> <Directory /source>
>
> #with your Action tag here... this way you can
> #still have regular .java files on your server.
>
> </Directory>
>

EXAMPLE

       assuming code2html is in the current directory, you may type

                             code2html -l perl code2html.pl code2html.html

       to convert the script into a html file.

FILES

Code2html looks for it's configuration in several places.

• the file specified by -L or --language-file if any

• the files specified in the evironment variable CODE2HTML_CONFIG, seperated by colons

• user's $HOME/.code2html.config

• /etc/code2html.config

• built in default languages

Entries in a file that is mentioned earlier in this list override rules from later files.

The file structure must be valid perl code.

The global variables %LANGUAGE and %STYLESHEET are already defined, so you should not
redeclare them using “my”.

When you are looking for a model configuration to serve as a basis for your own
configuration file, it is probably best to start out by checking the built-in definitions
at the bottom of code2html.

If your pattern includes back references like a lot patterns do in perl for example, then
you have to use \2 instead of \1, \3 instead of \2 and so on. I really don't like this
hack but it is a lot faster.

Example:

<<([^\n]*).*?^\2$

In this example the perl << stuff is matched, i.e. everything from a << until a line that
consists of exactly the same string as behind the << was. The \2 references the matched
chars in the parentenses.

If you ever write language specific rule files yourself, I'd be grateful if you could send
those to me, so I could make them available (with full credits of course) on my homepage
for anyone to grab, whenever some of those files suit someone else's needs. Before you do
so you might also have a look at my site to check wheter someone has already written a
rule file for your favourite language.

NOTES

       The language recognition mechanism relies on specific patterns within the  file  name  and
       the  content  of the processed file, such as file name extensions and shebangs (#!).  This
       means that if the input is a pipe or a socket, the file name does not  follow  traditional
       naming conventions, or the content of the processed file is incomplete, the input language
       name should be specified using the --language-mode command line parameter.

BUGS

       Please report bugs to code2html@palfrader.org.  This program is still a beta  release,  so
       you should expect to find some.
       Also  have  a  look  at  my  web-site,  perhaps  a  new  version  is  available already at
       http://www.palfrader.org/code2html/.

AUTHOR

       Peter Palfrader, <code2html@palfrader.org> A lot of other people.  See contributers in the
       file itself.

LICENSE

       Copyright (c) 1999, 2000 by Peter Palfrader & others.

       Permission  is  hereby  granted,  free  of  charge, to any person obtaining a copy of this
       software and associated documentation files (the  “Software”,  to  deal  in  the  Software
       without  restriction, including without limitation the rights to use, copy, modify, merge,
       publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
       to whom the Software is furnished to do so, subject to the following conditions:

       The  above  copyright notice and this permission notice shall be included in all copies or
       substantial portions of the Software.

       THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT  WARRANTY  OF  ANY  KIND,  EXPRESS  OR  IMPLIED,
       INCLUDING  BUT  NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
       PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
       FOR  ANY  CLAIM,  DAMAGES  OR  OTHER  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
       OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR  THE  USE  OR  OTHER
       DEALINGS IN THE SOFTWARE.