[comment {-*- mode: tcl ;fill-column: 90 -*- doctools manpage}]
[vset VERSION 0.7.0]
[manpage_begin mkdoc n [vset VERSION]]
[copyright {2019-2022, Detlef Groth <detlef(at)dgroth(dot)de>}]
[moddesc   {Source code documentation using Markdown}]
[titledesc {Extracts and optionally converts Markdown comments in source code to HTML}]
[category  {Text processing}]
[require Tcl 8.6]
[require Markdown [opt 1.2.1]]
[require yaml [opt 0.4.1]]
[require mkdoc [opt [vset VERSION]]]
[require hook]
[description]

The package [package mkdoc] provides a command to extract documentation embedded in code
and optionally convert these comments into HTML.

The latter uses Tcllib's [package Markdown] package.

Each line of the embedded documentation begins with the special comment marker
[const "#'"].

[list_begin definitions]

[call [cmd ::mkdoc::mkdoc] [arg infile] [arg outfile] [opt "[option -css] [arg cssfile]"]]

The command reads the specified [arg infile] and extracts the code comments introduced by
the [const " #'"] marker.  If the [arg outfile] is either a [file .html] or [file .htm]
file the Markdown is converted into HTML using either a default style or the specified
style sheet [arg cssfile].

[para] All arguments are paths to the files to read from or write to.

[para] The result of the command is the empty string.

[para] See section [sectref Formatting] for the supported Markdown syntax and extensions
to it.

[call [cmd ::mkdoc::run] [arg infile]]

The command reads the specified [arg infile], extracts the embedded documentation, and
then executes the contents of the first example, i.e. [const ```]-quoted block, found in
the [const Example] section.

[para] Here is such an example which will be executed by the Tcl interpreter

[example {
    #' ## <a name="example">Example</a>
    #' 
    #' ```
    #' puts "Hello mkdoc package"
    #' puts "I am in the example section"
    #' ```
}]

[para] [strong {DANGER, BEWARE}].
Failing to open the [arg infile] causes the command to [strong exit] the entire process.

[para] Use of this command in a general context is not recommended.

[list_end]

[section Examples]

The example below demonstrates the conversion of the documentation embedded into the file
[file mkdoc.tcl] itself:

[para][example {
    package require mkdoc
    # extracting the Markdown
    mkdoc::mkdoc mkdoc.tcl mkdoc.md
    # converting Markdown to HTML
    mkdoc::mkdoc mkdoc.md mkdoc.html
    # direct conversion without intermediate file
    mkdoc::mkdoc mkdoc.tcl mkdoc.html
}]

[section Formatting]

The package supports the syntax supported by Tcllib's [package Markdown] package.

[para] It further supports a set of simple YAML headers whose information is inserted into
appropriate HTML [const meta]-tags. The supported keys are

[list_begin definitions]
[def [const author]] Set the document author. Defaults to [const NN].
[def [const title]] Set the document title. Defaults to [const "Documentation "][var filename]].
[def [const date]] Sets the document date. Defaults to the current day.
[def [const css]] Sets a custom CSS stylesheet. Defaults to the internal mkdoc sheet.
[list_end]

[para] [emph Note] that in Markdown output mode these headers are simply passed through
into the result. This is proper, as processors like [syscmd pandoc] are able to use them
as well.

[para] See the example below for the syntax:

[example {
    #' ---
    #' title: mkdoc::mkdoc 0.7.0
    #' author: Detlef Groth, Schwielowsee, Germany
    #' date: 2022-04-17 
    #' css: mini.css 
    #' ---
    #'
}]


[para] Another extension over standard Markdown is the support of a single level of includes.

[para] See the example below for the syntax:

[example {
    #' #include "path/to/include/file"
}]

[para] [emph Note], the double-quotes around the path are part of the syntax.

[para] [strong Beware] further that relative paths are resolved relative to the current
working directory, and [strong not] relative to the location of the including file.

[section "Bugs, Ideas, Feedback"]

This document, and the package it describes, will undoubtedly contain bugs and other
problems. Please report such to the author of this package. Please also report any ideas
for enhancements you may have for either package and/or documentation.

[section "Code Copyright"]

BSD License type:

[para] The following terms apply to all files a ssociated with the software unless
explicitly disclaimed in individual files.

[para] The authors hereby grant permission to use, copy, modify, distribute, and license
this software and its documentation for any purpose, provided that existing copyright
notices are retained in all copies and that this notice is included verbatim in any
distributions. No written agreement, license, or royalty fee is required for any of the
authorized uses.  Modifications to this software may be copyrighted by their authors and
need not follow the licensing terms described here, provided that the new terms are
clearly indicated on the first page of each file where they apply.

[para] In no event shall the authors or distributors be liable to any party for direct,
indirect, special, incidental, or consequential damages arising out of the use of this
software, its documentation, or any derivatives thereof, even if the authors have been
advised of the possibility of such damage.

[para] The authors and distributors specifically disclaim any warranties, including, but
not limited to, the implied warranties of merchantability, fitness for a particular
purpose, and non-infringement.

This software is provided on an "as is" basis, and the authors and distributors have no
obligation to provide maintenance, support, updates, enhancements, or modifications.

[para] [strong {RESTRICTED RIGHTS}]: Use, duplication or disclosure by the government is
subject to the restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in
Technical Data and Computer Software Clause as DFARS 252.227-7013 and FAR 52.227-19.

[vset CATEGORY mkdoc]
[manpage_end]