X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/b1c9ca545bd58a8db665e06c5867ede2fe94e32a..5ec2d2d40d803ac0288acdcdd5125de6f4c2b769:/doc/tips/convert_mediawiki_to_ikiwiki.mdwn

diff --git a/doc/tips/convert_mediawiki_to_ikiwiki.mdwn b/doc/tips/convert_mediawiki_to_ikiwiki.mdwn
index c522eaec3..e60b413dd 100644
--- a/doc/tips/convert_mediawiki_to_ikiwiki.mdwn
+++ b/doc/tips/convert_mediawiki_to_ikiwiki.mdwn
@@ -1,4 +1,6 @@
-Mediawiki is a dynamically-generated wiki which stores it's data in a
+[[!toc levels=2]]
+
+Mediawiki is a dynamically-generated wiki which stores its data in a
 relational database. Pages are marked up using a proprietary markup. It is
 possible to import the contents of a Mediawiki site into an ikiwiki,
 converting some of the Mediawiki conventions into Ikiwiki ones.
@@ -6,6 +8,9 @@ converting some of the Mediawiki conventions into Ikiwiki ones.
 The following instructions describe ways of obtaining the current version of
 the wiki. We do not yet cover importing the history of edits.
 
+Another set of instructions and conversion tools (which imports the full history)
+can be found at <http://github.com/mithro/media2iki>
+
 ## Step 1: Getting a list of pages
 
 The first bit of information you require is a list of pages in the Mediawiki.
@@ -25,25 +30,54 @@ that this script is sensitive to the specific markup used on the page, so if
 you have tweaked your mediawiki theme a lot from the original, you will need
 to adjust this script too:
 
+    import sys
     from xml.dom.minidom import parse, parseString
     
-    dom = parse(argv[1])
+    dom = parse(sys.argv[1])
     tables = dom.getElementsByTagName("table")
     pagetable = tables[-1]
     anchors = pagetable.getElementsByTagName("a")
     for a in anchors:
         print a.firstChild.toxml().\
-            replace('&amp;,'&').\
+            replace('&amp;','&').\
             replace('&lt;','<').\
             replace('&gt;','>')
 
 Also, if you have pages with titles that need to be encoded to be represented
 in HTML, you may need to add further processing to the last line.
 
+Note that by default, `Special:Allpages` will only list pages in the main
+namespace. You need to add a `&namespace=XX` argument to get pages in a
+different namespace. (See below for the default list of namespaces)
+
+Note that the page names obtained this way will not include any namespace
+specific prefix: e.g. `Category:` will be stripped off.
+
 ### Querying the database
 
 If you have access to the relational database in which your mediawiki data is
-stored, it is possible to derive a list of page names from this.
+stored, it is possible to derive a list of page names from this. With mediawiki's
+MySQL backend, the page table is, appropriately enough, called `table`:
+
+    SELECT page_namespace, page_title FROM page;
+
+As with the previous method, you will need to do some filtering based on the
+namespace.
+
+### namespaces
+
+The list of default namespaces in mediawiki is available from <http://www.mediawiki.org/wiki/Manual:Namespace#Built-in_namespaces>. Here are reproduced the ones you are most likely to encounter if you are running a small mediawiki install for your own purposes:
+
+[[!table data="""
+Index   | Name         | Example
+0       | Main         | Foo
+1       | Talk         | Talk:Foo
+2       | User         | User:Jon
+3       | User talk    | User_talk:Jon
+6       | File         | File:Barack_Obama_signature.svg
+10      | Template     | Template:Prettytable
+14      | Category     | Category:Pages_needing_review
+"""]]
 
 ## Step 2: fetching the page data
 
@@ -51,7 +85,7 @@ Once you have a list of page names, you can fetch the data for each page.
 
 ### Method 1: via HTTP and `action=raw`
 
-You need to create two derived strings from the page titles already: the
+You need to create two derived strings from the page titles: the
 destination path for the page and the source URL. Assuming `$pagename` 
 contains a pagename obtained above, and `$wiki` contains the URL to your
 mediawiki's `index.php` file:
@@ -62,6 +96,15 @@ mediawiki's `index.php` file:
     mkdir -p `dirname "$dest"`
     wget -q "$wiki?title=$src&action=raw" -O "$dest"
 
+You may need to add more conversions here depending on the precise page titles
+used in your wiki.
+
+If you are trying to fetch pages from a different namespace to the default,
+you will need to prefix the page title with the relevant prefix, e.g.
+`Category:` for category pages. You probably don't want to prefix it to the
+output page, but you may want to vary the destination path (i.e. insert an
+extra directory component corresponding to your ikiwiki's `tagbase`).
+
 ### Method 2: via HTTP and `Special:Export`
 
 Mediawiki also has a special page `Special:Export` which can be used to obtain
@@ -79,19 +122,165 @@ the result.
 It is possible to extract the page data from the database with some
 well-crafted queries.
 
-## Step 2: format conversion
+## Step 3: format conversion
+
+The next step is to convert Mediawiki conventions into Ikiwiki ones.
+
+### categories
+
+Mediawiki uses a special page name prefix to define "Categories", which
+otherwise behave like ikiwiki tags. You can convert every Mediawiki category
+into an ikiwiki tag name using a script such as
+
+    import sys, re
+    pattern =  r'\[\[Category:([^\]]+)\]\]'
+    
+    def manglecat(mo):
+            return '\[[!tag %s]]' % mo.group(1).strip().replace(' ','_')
+            
+    for line in sys.stdin.readlines():
+            res = re.match(pattern, line)
+            if res:
+                    sys.stdout.write(re.sub(pattern, manglecat, line))
+            else: sys.stdout.write(line)
+
+## Step 4: Mediawiki plugin or Converting to Markdown
+
+You can use a plugin to make ikiwiki support Mediawiki syntax, or you can 
+convert pages to a format ikiwiki understands.
+
+### Step 4a: Mediawiki plugin
+
+The [[plugins/contrib/mediawiki]] plugin can be used by ikiwiki to interpret
+most of the Mediawiki syntax.
+
+The following things are not working:
+
+* templates
+* tables
+* spaces and other funky characters ("?") in page names
+
+### Step 4b: Converting pages
+
+#### Converting to Markdown
+
+There is a Python script for converting from the Mediawiki format to Markdown in [[mithro]]'s conversion repository at <http://github.com/mithro/media2iki>. *WARNING:* While the script tries to preserve everything is can, Markdown syntax is not as flexible as Mediawiki so the conversion is lossy!
+
+    # The script needs the mwlib library to work
+    # If you don't have easy_install installed, apt-get install python-setuptools
+    sudo easy_install mwlib
+    
+    # Get the repository
+    git clone git://github.com/mithro/media2iki.git
+    cd media2iki
+    
+    # Do a conversion
+    python mediawiki2markdown.py --no-strict --no-debugger <my mediawiki file> > output.md
+
+
+[[mithro]] doesn't frequent this page, so please report issues on the [github issue tracker](https://github.com/mithro/media2iki/issues).
+
+## Scripts
+
+There is a repository of tools for converting MediaWiki to Git based Markdown wiki formats (such as ikiwiki and github wikis) at <http://github.com/mithro/media2iki>. It also includes a standalone tool for converting from the Mediawiki format to Markdown. [[mithro]] doesn't frequent this page, so please report issues on the [github issue tracker](https://github.com/mithro/media2iki/issues).
+
+[[Albert]] wrote a ruby script to convert from mediawiki's database to ikiwiki at <https://github.com/docunext/mediawiki2gitikiwiki>
+
+[[scy]] wrote a python script to convert from mediawiki XML dumps to git repositories at <https://github.com/scy/levitation>.
+
+[[Anarcat]] wrote a python script to convert from a mediawiki website to ikiwiki at git://src.anarcat.ath.cx/mediawikigitdump.git/. The script doesn't need any special access or privileges and communicates with the documented API (so it's a bit slower, but allows you to mirror sites you are not managing, like parts of Wikipedia). The script can also incrementally import new changes from a running site, through RecentChanges inspection. It also supports mithro's new Mediawiki2markdown converter (which I have a copy here: git://src.anarcat.ath.cx/media2iki.git/).
+
+> Some assembly is required to get Mediawiki2markdown and its mwlib
+> gitmodule available in the right place for it to use.. perhaps you could
+> automate that? --[[Joey]]
+
+> > You mean a debian package? :) media2iki is actually a submodule, so you need to go through extra steps to install it. mwlib being the most annoying part... I have fixed my script so it looks for media2iki directly in the submodule and improved the install instructions in the README file, but I'm not sure I can do much more short of starting to package the whole thing... --[[anarcat]]
+
+>>> You may have forgotten to push that, I don't see those changes.
+>>> Packaging the python library might be a good 1st step.
+>>> --[[Joey]] 
+
+> Also, when I try to run it with -t on www.amateur-radio-wiki.net, it
+> fails on some html in the page named "4_metres". On archiveteam.org,
+> it fails trying to write to a page filename starting with "/", --[[Joey]]
+
+> > can you show me exactly which commandline arguments you're using? also, I have made improvements over the converter too, also available here: git://src/anarcat.ath.cx/media2iki.git/ -- [[anarcat]]
+
+>>> Not using your new converter, just the installation I did earlier
+>>> today:
+>>> --[[Joey]] 
+
+<pre>
+fetching page 4 metres  from http://www.amateur-radio-wiki.net//index.php?action=raw&title=4+metres into 4_metres.mdwn
+Unknown tag TagNode tagname='div' vlist={'style': {u'float': u'left', u'border': u'2px solid #aaa', u'margin-left': u'20px'}}->'div' div
+Traceback (most recent call last):
+  File "./mediawikigitdump.py", line 298, in <module>
+    fetch_allpages(namespace)
+  File "./mediawikigitdump.py", line 82, in fetch_allpages
+    fetch_page(page.getAttribute('title'))
+  File "./mediawikigitdump.py", line 187, in fetch_page
+    c.parse(urllib.urlopen(url).read())
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 285, in parse
+    self.parse_node(ast)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 76, in parse_node
+    f(node)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 88, in on_article
+    self.parse_children(node)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 83, in parse_children
+    self.parse_node(child)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 76, in parse_node
+    f(node)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 413, in on_section
+    self.parse_node(child)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 76, in parse_node
+    f(node)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 83, in parse_children
+    self.parse_node(child)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 76, in parse_node
+    f(node)
+  File "/home/joey/tmp/mediawikigitdump/mediawiki2markdown.py", line 474, in on_tagnode
+    assert not options.STRICT
+AssertionError
+zsh: exit 1     ./mediawikigitdump.py -v -t http://www.amateur-radio-wiki.net/
+</pre>
 
-The next step is to convert Mediawiki conventions into Ikiwiki ones. These
-include
+<pre>
+joey@wren:~/tmp/mediawikigitdump>./mediawikigitdump.py -v -t http://archiveteam.org            
+fetching page list from namespace 0 ()
+found 222 pages
+fetching page /Sites using MediaWiki (English)  from http://archiveteam.org/index.php?action=raw&title=%2FSites+using+MediaWiki+%28English%29 into /Sites_using_MediaWiki_(English).mdwn
+Traceback (most recent call last):
+  File "./mediawikigitdump.py", line 298, in <module>
+    fetch_allpages(namespace)
+  File "./mediawikigitdump.py", line 82, in fetch_allpages
+    fetch_page(page.getAttribute('title'))
+  File "./mediawikigitdump.py", line 188, in fetch_page
+    f = open(filename, 'w')
+IOError: [Errno 13] Permission denied: u'/Sites_using_MediaWiki_(English).mdwn'
+zsh: exit 1     ./mediawikigitdump.py -v -t http://archiveteam.org
+</pre>
 
- * convert Categories into tags
- * ...
+> > > > > I have updated my script to call the parser without strict mode and to trim leading slashes (and /../, for that matter...) -- [[anarcat]]
 
-## External links
+> > > > > > Getting this error with the new version on any site I try (when using -t only): `TypeError: argument 1 must be string or read-only character buffer, not None` 
+> > > > > > bisecting, commit 55941a3bd89d43d09b0c126c9088eee0076b5ea2 broke it.
+> > > > > > --[[Joey]] 
 
-[[sabr]] used to explain how to [import MediaWiki content into
-git](http://u32.net/Mediawiki_Conversion/index.html?updated), including full
-edit history, but as of 2009/10/16 that site is not available.
+> > > > > > > I can't reproduce here, can you try with -v or -d to try to trace down the problem? -- [[anarcat]]
 
-The [[plugins/contrib/mediawiki]] plugin can then be used by ikiwiki to build
-the wiki.
+<pre>
+fetching page list from namespace 0 ()
+found 473 pages
+fetching page 0 - 9  from http://www.amateur-radio-wiki.net/index.php?action=raw&title=0+-+9 into 0_-_9.mdwn
+Traceback (most recent call last):
+  File "./mediawikigitdump.py", line 304, in <module>
+    main()
+  File "./mediawikigitdump.py", line 301, in main
+    fetch_allpages(options.namespace)
+  File "./mediawikigitdump.py", line 74, in fetch_allpages
+    fetch_page(page.getAttribute('title'))
+  File "./mediawikigitdump.py", line 180, in fetch_page
+    f.write(options.convert(urllib.urlopen(url).read()))
+TypeError: argument 1 must be string or read-only character buffer, not None
+zsh: exit 1     ./mediawikigitdump.py -v -d -t http://www.amateur-radio-wiki.net/
+</pre>