++ed by:
Yichun Zhang (章亦春)

NAME

Makefile::GraphViz - Draw building flowcharts from Makefiles using GraphViz

VERSION

This document describes Makefile::GraphViz 0.20 released on 29 November 2011.

SYNOPSIS

  use Makefile::GraphViz;

  $parser = Makefile::GraphViz->new;
  $parser->parse('Makefile');

  # plot the tree rooted at the 'install' goal in Makefile:
  $gv = $parser->plot('install');  # A GraphViz object returned.
  $gv->as_png('install.png');

  # plot the tree rooted at the 'default' goal in Makefile:
  $gv = $parser->plot;
  $gv->as_png('default.png');

  # plot the forest consists of all the goals in Makefile:
  $gv = $parser->plot_all;
  $gv->as_png('default.png');

  # you can also invoke all the methods
  # inherited from the Makefile::Parser class:
  @targets = $parser->targets;

DESCRIPTION

This module uses Makefile::Parser to render user's Makefiles via the amazing GraphViz module. Before I decided to write this thing, there had been already a CPAN module named GraphViz::Makefile which did the same thing. However, the pictures generated by GraphViz::Makefile is oversimplified in my opinion, so a much complex one is still needed.

For everyday use, the gvmake utility is much more convenient than using this module directly. :)

WARNING This module is highly experimental and is currently at alpha stage, so production use is strongly discouraged right now. Anyway, I have the plan to improve this stuff unfailingly.

For instance, the following makefile

    all: foo
    all: bar
            echo hallo

    any: foo hiya
            echo larry
            echo howdy
    any: blah blow

    foo:: blah boo
            echo Hi
    foo:: howdy buz
            echo Hey

produces the following image via the plot_all method:

PNG IMAGE

image hosted by agentzh.org

Image hosted by agentzh.org

SAMPLE PICTURES

Browse http://search.cpan.org/src/AGENT/Makefile-GraphViz-0.16/samples.html for some sample output graphs.

INSTALLATION

Prerequisites GraphViz and Makefile::Parser should be installed to your Perl distribution first. Among other things, the GraphViz module needs tools "dot", "neato", "twopi", "circo" and "fdp" from the Graphviz project (http://www.graphviz.org/ or http://www.research.att.com/sw/tools/graphviz/). Hence you have to download an executable package of AT&T's Graphviz for your platform or build it from source code yourself.

The Makefile::GraphViz Class

This class is a subclass inherited from Makefile::Parser. So all the methods (and hence all the functionalities) provided by Makefile::Parser are accessible here. Additionally this class also provides some more methods on its own right.

METHODS

$graphviz = plot($target, ...)

This method is essential to the class. Users invoke this method to plot the specified Makefile target. If the argument is absent, the default target in the Makefile will be used. It will return a GraphViz object, on which you can later call the as_png or as_text method to obtain the final graphical output.

The argument can both be the target's name and a Makefile::Target object. If the given target can't be found in Makefile, the target will be plotted separately.

This method also accepts several options.

    $gv = $parser->plot(undef, normal_nodes => ['mytar']);
    $gv = $parser->plot(
        'cmintester',
        exclude  => [qw(
            all hex2bin.exe exe2hex.pl bin2asm.pl
            asm2ast.pl ast2hex.pl cod2ast.pl
        )],
        end_with => [qw(pat_cover.ast pat_cover)],
        normal_nodes => ['pat_cover.ast'],
        vir_nodes => ['pat_cover'],
        trim_mode => 0,
    );
cmd_style

This option controls the style of the shell command box. The default appearance for these nodes are gray ellipses.

edge_style

This option's value will be passed directly to GraphViz's add_edge method. It controls the appearance of the edges in the output graph, which is default to red directed arrows.

    $gv = $parser->plot(
        'install',
        edge_style => {
            style => 'dotted',
            color => 'seagreen',
        },
    );
end_with

This option takes a list ref as its value. The plot method won't continue to iterate the subtree rooted at entries in the list. It is worth noting that the entries themselves will be displayed as usual. This is the only difference compared to the exclude option.

Here is an example:

    $gv = $parser->plot(
        'cmintester',
        end_with => [qw(pat_cover.ast pat_cover)],
    );
exclude

This option takes a list ref as its value. All the entries in the list won't be displayed and the subtrees rooted at these entries won't be displayed either.

    $parser->plot(
        'clean',
        exclude=>[qw(foo.exe foo.pl)]
    )->as_png('clean.png');
gv

This option accepts user's GraphViz object to render the graph.

    $gv = GraphViz->new(width => 30, height => 20,
                        pagewidth => 8.5, pageheight => 11);
    $parser->plot('install', gv => $gv);
    print $gv->as_text;
init_args

This option takes a hash ref whose value will be passed to the constructor of the GraphViz class if the option gv is not specified:

    $parser->plot(
        'install',
        init_args => {
            width => 30, height => 20,
            pagewidth => 8.5, pageheight => 11,
        },
    )->as_png('a.png');
normal_nodes

The entries in this option's list are forced to be the normal nodes. Normal nodes are defined to be the Makefile targets corresponding to disk files. In contrast, virtual nodes are those Makefile targets with no real files corresponding to them.

normal_node_style

Override the default style for the normal nodes. By default, normal nodes are yellow rectangles with black border.

    $gv = $parser->plot(
        'install',
        normal_node_style => {
           shape => 'circle',
           style => 'filled',
           fillcolor => 'red',
        },
    );
trim_mode

When this option is set to a true value, no shell command nodes will be plotted.

vir_nodes

The entries in this option's list are forced to be the virtual nodes. Virtual nodes are those Makefile targets with no real files corresponding to them, which are generally called "phony targets" in the GNU make Manual and "pseudo targets" in MS NMAKE's docs.

vir_node_style

Override the default style for the virtual nodes.

    $gv = $parser->plot(
        'install',
        virtual_node_style => {
           shape => 'box',
           style => 'filled',
           fillcolor => 'blue',
        },
    );

By default, virtual nodes are yellow rectangles with no border.

$graphviz = $object->plot_all()

Plot all the (root) goals appeared in the Makefile.

INTERNAL FUNCTIONS

Internal functions should not be used directly.

_gen_id

Generate a unique id for command node.

_trim_path

Trim the path to a more readable form.

_trim_cmd

Trim the shell command to a more friendly size.

_find

If the given element is found in the given list, this function will return 1; otherwise, a false value is returned.

TODO

  • Add support for the various options provided by the plot method to the plot_all method.

  • Use Params::Util to check the validity of the method arguments.

  • Use the next generation of Makefile::Parser to do the underlying parsing job.

CODE COVERAGE

I use Devel::Cover to test the code coverage of my tests, below is the Devel::Cover report on this module test suite.

  ---------------------------- ------ ------ ------ ------ ------ ------ ------
  File                           stmt   bran   cond    sub    pod   time  total
  ---------------------------- ------ ------ ------ ------ ------ ------ ------
  .../lib/Makefile/GraphViz.pm  100.0   93.2   71.4  100.0  100.0   61.5   92.1
  ---------------------------- ------ ------ ------ ------ ------ ------ ------

SOURCE CONTROL

For the very latest version of this module, check out the source from the Git repository below:

https://github.com/agentzh/makefile-graphviz-pm

There is anonymous access to all. If you'd like a commit bit, please let me know. :)

BUGS

Please report bugs or send wish-list to https://github.com/agentzh/makefile-graphviz-pm/issues.

SEE ALSO

gvmake, GraphViz, Makefile::Parser.

AUTHOR

Zhang "agentzh" Yichun (章亦春) <agentzh@gmail.com>

COPYRIGHT AND LICENSE

Copyright (c) 2005-2011 by Zhang "agentzh" Yichun (章亦春).

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




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