Syntax::Highlight::Shell - Highlight shell scripts

Version 0.04

    use Syntax::Highlight::Shell;

    my $highlighter = new Syntax::Highlight::Shell;
    $output = $highlighter->parse($script);

If $script contains the following shell code:

    # an if statement
    if [ -f /etc/passwd ]; then
        grep $USER /etc/passwd | awk -F: '{print $5}' /etc/passwd
    fi

then the resulting HTML contained in $output will render like this:

This module is designed to take shell scripts and highlight them in HTML with meaningful colours using CSS. The resulting HTML output is ready for inclusion in a web page. Note that no reformating is done, all spaces are preserved.

new()

The constructor. Returns a Syntax::Highlight::Shell object, which derives from Shell::Parser.

Options

• nnn - Activate line numbering. Default value: 0 (disabled).
• pre - Surround result by <pre>...</pre> tags. Default value: 1 (enabled).
• syntax - Selects the shell syntax. Check the documentation about the syntax() method in Shell::Parser documentation for more information on the available syntaxes. Default value: bourne.
• tabs - When given a non-nul value, converts tabulations to this number of spaces. Default value: 4.

Example

To avoid surrounding the result by the <pre>...</pre> tags:

    my $highlighter = Syntax::Highlight::Shell->new(pre => 0);

parse()

Parse the shell code given in argument and returns the corresponding HTML code, ready for inclusion in a web page.

Examples

    $html = $highlighter->parse(q{ echo "hello world" });

    $html = $highlighter->parse(<<'END');
        # find my name
        if [ -f /etc/passwd ]; then
            grep $USER /etc/passwd | awk -F: '{print $5}' /etc/passwd
        fi
    END

The following methods are for internal use only.

_generic_highlight()

Shell::Parser callback that does all the work of highlighting the code.

The resulting HTML uses CSS to colourize the syntax. Here are the classes that you can define in your stylesheet.

• .s-key - for shell keywords, like if, for, while, do...
• .s-blt - for the builtins commands
• .s-cmd - for the external commands
• .s-arg - for the command arguments
• .s-mta - for shell metacharacters, like |, >, \, &
• .s-quo - for the single (') and double (") quotes
• .s-var - for expanded variables: $VARIABLE
• .s-avr - for assigned variables: VARIABLE=value
• .s-val - for shell values (inside quotes)
• .s-cmt - for shell comments

An example stylesheet can be found in examples/shell-syntax.css.

Here is an example of generated HTML output. It was generated with the script eg/highlight.pl.

The following shell script

    #!/bin/sh

    user="$1"

    case "$user" in
      # check if the user is root
      'root')
        echo "You are the BOFH."
        ;;

      # for normal users, grep throught /etc/passwd
      *)
        passwd=/etc/passwd
        if [ -f $passwd ]; then 
            grep "$user" $passwd | awk -F: '{print $5}'
        else
            echo "No $passwd"
        fi
    esac

will be rendered like this (using the CSS stylesheet eg/shell-syntax.css):

Syntax::Highlight::Shell relies on Shell::Parser for parsing the shell code and therefore suffers from the same limitations.

Shell::Parser

Sébastien Aperghis-Tramoni, <sebastien@aperghis.net>

Please report any bugs or feature requests to bug-syntax-highlight-shell@rt.cpan.org, or through the web interface at https://rt.cpan.org/NoAuth/ReportBug.html?Queue=Syntax-Highlight-Shell. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

Copyright 2004 Sébastien Aperghis-Tramoni, All Rights Reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.