#!/usr/bin/perl
# Copyright (C) 2013
# Benoit Person <[email protected]>
# Celestin Matte <[email protected]>
# License: GPL v2 or later
# Set of tools for git repo with a mediawiki remote.
# Documentation & bugtracker: https://github.com/Git-Mediawiki/Git-Mediawiki
use strict;
use warnings;
use Getopt::Long;
use URI::URL qw(url);
use LWP::UserAgent;
use HTML::TreeBuilder;
use Git;
use MediaWiki::API;
use Git::Mediawiki qw(clean_filename connect_maybe
EMPTY HTTP_CODE_PAGE_NOT_FOUND);
# By default, use UTF-8 to communicate with Git and the user
binmode STDERR, ':encoding(UTF-8)';
binmode STDOUT, ':encoding(UTF-8)';
# Global parameters
my $verbose = 0;
sub v_print {
if ($verbose) {
return print {*STDERR} @_;
}
return;
}
# Preview parameters
my $file_name = EMPTY;
my $remote_name = EMPTY;
my $preview_file_name = EMPTY;
my $autoload = 0;
sub file {
$file_name = shift;
return $file_name;
}
my %commands = (
'help' =>
[\&help, {}, \&help],
'preview' =>
[\&preview, {
'<>' => \&file,
'output|o=s' => \$preview_file_name,
'remote|r=s' => \$remote_name,
'autoload|a' => \$autoload
}, \&preview_help]
);
# Search for sub-command
my $cmd = $commands{'help'};
for (0..@ARGV-1) {
if (defined $commands{$ARGV[$_]}) {
$cmd = $commands{$ARGV[$_]};
splice @ARGV, $_, 1;
last;
}
};
GetOptions( %{$cmd->[1]},
'help|h' => \&{$cmd->[2]},
'verbose|v' => \$verbose);
# Launch command
&{$cmd->[0]};
############################# Preview Functions ################################
sub preview_help {
print {*STDOUT} <<'END';
USAGE: git mw preview [--remote|-r <remote name>] [--autoload|-a]
[--output|-o <output filename>] [--verbose|-v]
<blob> | <filename>
DESCRIPTION:
Preview is an utiliy to preview local content of a mediawiki repo as if it was
pushed on the remote.
For that, preview searches for the remote name of the current branch's
upstream if --remote is not set. If that remote is not found or if it
is not a mediawiki, it lists all mediawiki remotes configured and asks
you to replay your command with the --remote option set properly.
Then, it searches for a file named 'filename'. If it's not found in
the current dir, it will assume it's a blob.
The content retrieved in the file (or in the blob) will then be parsed
by the remote mediawiki and combined with a template retrieved from
the mediawiki.
Finally, preview will save the HTML result in a file. and autoload it
in your default web browser if the option --autoload is present.
OPTIONS:
-r <remote name>, --remote <remote name>
If the remote is a mediawiki, the template and the parse engine
used for the preview will be those of that remote.
If not, a list of valid remotes will be shown.
-a, --autoload
Try to load the HTML output in a new tab (or new window) of your
default web browser.
-o <output filename>, --output <output filename>
Change the HTML output filename. Default filename is based on the
input filename with its extension replaced by '.html'.
-v, --verbose
Show more information on what's going on under the hood.
END
exit;
}
sub preview {
my $wiki;
my ($remote_url, $wiki_page_name);
my ($new_content, $template);
my $file_content;
if ($file_name eq EMPTY) {
die "Missing file argument, see `git mw help`\n";
}
v_print("### Selecting remote\n");
if ($remote_name eq EMPTY) {
$remote_name = find_upstream_remote_name();
if ($remote_name) {
$remote_url = mediawiki_remote_url_maybe($remote_name);
}
if (! $remote_url) {
my @valid_remotes = find_mediawiki_remotes();
if ($#valid_remotes == 0) {
print {*STDERR} "No mediawiki remote in this repo. \n";
exit 1;
} else {
my $remotes_list = join("\n\t", @valid_remotes);
print {*STDERR} <<"MESSAGE";
There are multiple mediawiki remotes, which of:
${remotes_list}
do you want ? Use the -r option to specify the remote.
MESSAGE
}
exit 1;
}
} else {
if (!is_valid_remote($remote_name)) {
die "${remote_name} is not a remote\n";
}
$remote_url = mediawiki_remote_url_maybe($remote_name);
if (! $remote_url) {
die "${remote_name} is not a mediawiki remote\n";
}
}
v_print("selected remote:\n\tname: ${remote_name}\n\turl: ${remote_url}\n");
$wiki = connect_maybe($wiki, $remote_name, $remote_url);
# Read file content
if (! -e $file_name) {
$file_content = git_cmd_try {
Git::command('cat-file', 'blob', $file_name); }
"%s failed w/ code %d";
if ($file_name =~ /(.+):(.+)/) {
$file_name = $2;
}
} else {
open my $read_fh, "<", $file_name
or die "could not open ${file_name}: $!\n";
$file_content = do { local $/ = undef; <$read_fh> };
close $read_fh
or die "unable to close: $!\n";
}
v_print("### Retrieving template\n");
($wiki_page_name = clean_filename($file_name)) =~ s/\.[^.]+$//;
$template = get_template($remote_url, $wiki_page_name);
v_print("### Parsing local content\n");
$new_content = $wiki->api({
action => 'parse',
text => $file_content,
title => $wiki_page_name
}, {
skip_encoding => 1
}) or die "No response from remote mediawiki\n";
$new_content = $new_content->{'parse'}->{'text'}->{'*'};
v_print("### Merging contents\n");
if ($preview_file_name eq EMPTY) {
($preview_file_name = $file_name) =~ s/\.[^.]+$/.html/;
}
open(my $save_fh, '>:encoding(UTF-8)', $preview_file_name)
or die "Could not open: $!\n";
print {$save_fh} merge_contents($template, $new_content, $remote_url);
close($save_fh)
or die "Could not close: $!\n";
v_print("### Results\n");
if ($autoload) {
v_print("Launching browser w/ file: ${preview_file_name}");
system('git', 'web--browse', $preview_file_name);
} else {
print {*STDERR} "Preview file saved as: ${preview_file_name}\n";
}
exit;
}
# uses global scope variable: $remote_name
sub merge_contents {
my $template = shift;
my $content = shift;
my $remote_url = shift;
my ($content_tree, $html_tree, $mw_content_text);
my $template_content_id = 'bodyContent';
$html_tree = HTML::TreeBuilder->new;
$html_tree->parse($template);
$content_tree = HTML::TreeBuilder->new;
$content_tree->parse($content);
$template_content_id = Git::config("remote.${remote_name}.mwIDcontent")
|| $template_content_id;
v_print("Using '${template_content_id}' as the content ID\n");
$mw_content_text = $html_tree->look_down('id', $template_content_id);
if (!defined $mw_content_text) {
print {*STDERR} <<"CONFIG";
Could not combine the new content with the template. You might want to
configure `mediawiki.IDContent` in your config:
git config --add remote.${remote_name}.mwIDcontent <id>
and re-run the command afterward.
CONFIG
exit 1;
}
$mw_content_text->delete_content();
$mw_content_text->push_content($content_tree);
make_links_absolute($html_tree, $remote_url);
return $html_tree->as_HTML;
}
sub make_links_absolute {
my $html_tree = shift;
my $remote_url = shift;
for (@{ $html_tree->extract_links() }) {
my ($link, $element, $attr) = @{ $_ };
my $url = url($link)->canonical;
if ($url !~ /#/) {
$element->attr($attr, URI->new_abs($url, $remote_url));
}
}
return $html_tree;
}
sub is_valid_remote {
my $remote = shift;
my @remotes = git_cmd_try {
Git::command('remote') }
"%s failed w/ code %d";
my $found_remote = 0;
foreach my $remote (@remotes) {
if ($remote eq $remote) {
$found_remote = 1;
last;
}
}
return $found_remote;
}
sub find_mediawiki_remotes {
my @remotes = git_cmd_try {
Git::command('remote'); }
"%s failed w/ code %d";
my $remote_url;
my @valid_remotes = ();
foreach my $remote (@remotes) {
$remote_url = mediawiki_remote_url_maybe($remote);
if ($remote_url) {
push(@valid_remotes, $remote);
}
}
return @valid_remotes;
}
sub find_upstream_remote_name {
my $current_branch = git_cmd_try {
Git::command_oneline('symbolic-ref', '--short', 'HEAD') }
"%s failed w/ code %d";
return Git::config("branch.${current_branch}.remote");
}
sub mediawiki_remote_url_maybe {
my $remote = shift;
# Find remote url
my $remote_url = Git::config("remote.${remote}.url");
if ($remote_url =~ s/mediawiki::(.*)/$1/) {
return url($remote_url)->canonical;
}
return;
}
sub get_template {
my $url = shift;
my $page_name = shift;
my ($req, $res, $code, $url_after);
$req = LWP::UserAgent->new;
if ($verbose) {
$req->show_progress(1);
}
$res = $req->get("${url}/index.php?title=${page_name}");
if (!$res->is_success) {
$code = $res->code;
$url_after = $res->request()->uri(); # resolve all redirections
if ($code == HTTP_CODE_PAGE_NOT_FOUND) {
if ($verbose) {
print {*STDERR} <<"WARNING";
Warning: Failed to retrieve '$page_name'. Create it on the mediawiki if you want
all the links to work properly.
Trying to use the mediawiki homepage as a fallback template ...
WARNING
}
# LWP automatically redirects GET request
$res = $req->get("${url}/index.php");
if (!$res->is_success) {
$url_after = $res->request()->uri(); # resolve all redirections
die "Failed to get homepage @ ${url_after} w/ code ${code}\n";
}
} else {
die "Failed to get '${page_name}' @ ${url_after} w/ code ${code}\n";
}
}
return $res->decoded_content;
}
############################## Help Functions ##################################
sub help {
print {*STDOUT} <<'END';
usage: git mw <command> <args>
git mw commands are:
help Display help information about git mw
preview Parse and render local file into HTML
END
exit;
}
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