iLiad ANNOUNCE: Lua5.1 package for Iliad

[ericshliao]

Well, it seems that "PANGO_MATRIX_INIT" is a special case that lgob does not recognize. It's neither one of the members or one of the Constants.

[Iñigo]

Hi,

here there is a proof of concept of the File Browser I'm working on to be included in Iliad Toolbox.

There is a lot of work yet, but I'm asking for some feedback now because I'm considering two opposite ways.

- one uses a flat treeview
. To enter into a directory, click in the filename or type columns for the proper row.


- the other uses a treeview.
. Clicking on a directory, you select it and expand or collapse it, depending on its previous state.
. To enter into a directory (and it will also be the new root for the treeview), select it and click on the "jump to" button on the top-right.
. For performance reasons, there are only 3 levels of children shown by default. It's an option configured inside the code. If we don't limit it think what would happen when navigating to the '/' of the device, the treeview would contain all the files on the system... too slow.


In both cases, you can go a directory up (or more) clicking on the "path" label (left to "jump to" button").
F.e., if it contains "/media/card/books/computers/ai", you could click on "/media/card/" to go there or on "/media/card/books/computers/", etc.
It's a pretty effect, you can see it completely running the program on your computer to see the hover effect (edit the initial PATH before executing) that can't be fully appreciated on the Iliad.

One of the current problems is that is quiet difficult to press '/' on that path to go the root of your Iliad.


Please note that the selection toggle in last column is not handled correctly by now.


To test both, move the files to the Iliad and run from a terminal with proper DISPLAY setting:

$ lua treeview.lua | path/to/xx -p

Well, too much talk by now... which one do you prefer? which one is more usable?

Iñigo

[ericshliao]

Originally Posted by Iñigo

which one do you prefer? which one is more usable?
Iñigo

Haven't tried it, but I personally prefer flat view.

[nrapallo]

Originally Posted by hansel

This is becoming a top thread: 6th if you sort by nr of replies
It even beats the battery hack thread

A very talkative threesome as can be seen...
Keep up the chatter; I'd love to jump in when I'm up-to-speed!

[hansel]

Iñigo,

I can make an installer for Lua/Lgob/xx if you want, but I think I will include Lua/Lgob/xx in apps I make: its small enough (750K), It's easier for users (they don't have to install 2 packages), and you are sure that they use a recent version.

It's no problem if a user already has it installed. And ipkg will not downgrade it if sombody tries to install an older version.

Do you still want a dedicated installer?

[Iñigo]

Originally Posted by nrapallo

A very talkative threesome as can be seen... Attachment 38436
Keep up the chatter; I'd love to jump in when I'm up-to-speed!

ouchhh... almost half of my posts in mobileread were written for this thread!

[hansel]

Originally Posted by nrapallo

Keep up the chatter; I'd love to jump in when I'm up-to-speed!

Welcome! Please get up to speed and jump in!

[hansel]

Originally Posted by ericshliao

There seems a convenient utility: toLua (http://www.tecgraf.puc-rio.br/~celes/tolua/). But I can't build it on my Linux desktop.

Do you mean tolua++? If not: its better use that. It is better maintained and has good support for C++. I'm using it with success and pleasure.

http://www.codenix.com/~tolua/

A copy of the version I use, and as small script to build it on linux without scons (an overkill if you ask me) can be found at
https://dev.mobileread.com/svn/luail...tools/tolua++/

[ericshliao]

Originally Posted by hansel

Do you mean tolua++? If not: its better use that. It is better maintained and has good support for C++. I'm using it with success and pleasure.

http://www.codenix.com/~tolua/

It seems that tolua++ is a fork of tolua.
What is the use case of of tolua (or tolua++)? I don't understand. Suppose I have some lib written in C, then can I use tolua to generate lua binding for the lib?

I want to use libxml2 with lua, and currently I only found lua binding for the part of xmlreader of libxml2 (http://asbradbury.org/projects/lua-xmlreader/). I need xmltree part. Can I use tolua to generate lua binding automatically?

[hansel]

Originally Posted by ericshliao

It seems that tolua++ is a fork of tolua.
What is the use case of of tolua (or tolua++)? I don't understand. Suppose I have some lib written in C, then can I use tolua to generate lua binding for the lib?

Yes and no . Basically you have to

1. write a file that decribes the functions you wand to be available in Lua (this looks very much like a C include file)
2. use tolua++ to generate C file (this handles the interface betwwen C and Lua)
3. compile and link this C file (+ your own code if you want) to a Lua module (a .so file).

This is easy for simple C libraries, and quite some work for C++ libs with lots of classes and types. If you google around, you will find some examples.
If I have some spare time (and no projects that are more fun ) I wil use tolua++ to do a Lua binding for some Iliad libraries...

Originally Posted by ericshliao

I want to use libxml2 with lua, and currently I only found lua binding for the part of xmlreader of libxml2 (http://asbradbury.org/projects/lua-xmlreader/). I need xmltree part. Can I use tolua to generate lua binding automatically?

Any interesting project in the pipeline? Depending on your needs, you might:

• expand http://asbradbury.org/projects/lua-xmlreader/
• do it with tolua++ (probably quite some work, since libxml2 is not a small simple C library
• use expat (basicaly sax, but easy to use to generate a DOM-like representation in Lua) see http://www.keplerproject.org/luaexpat/examples.html. Libexpat is installed on all Iliads, and a Lua binding is included in my LuaIliad package
• for simple things (if you only want to parse simple xml files), you might try my poor man's xml parser 'xl' which I use for Glade4Lua (see http://www.hpelbers.org/lua)

Have fun!

[ericshliao]

Originally Posted by hansel

Any interesting project in the pipeline? Depending on your needs, you might:

• expand http://asbradbury.org/projects/lua-xmlreader/
• do it with tolua++ (probably quite some work, since libxml2 is not a small simple C library
• use expat (basicaly sax, but easy to use to generate a DOM-like representation in Lua) see http://www.keplerproject.org/luaexpat/examples.html. Libexpat is installed on all Iliads, and a Lua binding is included in my LuaIliad package
• for simple things (if you only want to parse simple xml files), you might try my poor man's xml parser 'xl' which I use for Glade4Lua (see http://www.hpelbers.org/lua)

Have fun!

Thanx for the detailed reply.
I am trying and learning to expand lua-xmlreader. As to expat, I never understand the way it works. At least, I can understand the xmltree part of libxml2, so I choose libxml2.
What I want to do is to parse some xml file using docbook DTD, draw the contents (using different styles for different tags), and traverse the xmltree. Currently, I only find libxml2 provides me such functions.

[hansel]

Originally Posted by ericshliao

As to expat, I never understand the way it works.

Expat is easy to use: you define callbacks for the things you are interested in (tags, attributes), and expat calls those while traversing the file. Typically you remember some state in the calbacks (to know where you are in the document). You might even render the document while reading it (which is much more effective if you process large docs: no need to store everything in memory).

Lua Expat also has a simple DOM called LOM (Lua Object Model). This may very well be what you are looking for. See http://www.keplerproject.org/luaexpat/lom.html for an example.

Besides that, Expat is very fast, quite small, and already avalable on the Iliad...

Edit: I just checked that libxml2 (the so file, not a Lua binding) is also available on a standard Iliad: /usr/lib/libxml2.so.2.6.26. See http://www.hpelbers.org/iliad/list_of_libraries

[ericshliao]

Originally Posted by hansel

Lua Expat also has a simple DOM called LOM (Lua Object Model). This may very well be what you are looking for. See http://www.keplerproject.org/luaexpat/lom.html for an example.

Thanx. Just tried it. Lua-expat can fill my needs.

[hansel]

Hi,

I just upgraded the package for Lgob: the Lua binding for GTK+, Glib, GDK and Pango. This version has (probably) less bugs and more features Thanks again to Lucas Hermann Negri for this great Lua binding!

The new version can be downloaded here: https://dev.mobileread.com/dist/hans...liad-0.1.9.ipk. This version is based on the sources at http://downloads.tuxfamily.org/oproj...9.11.1.tar.bz2



Tip: I just discovered that I could browse all gtk, gdk, glib, etc docs with devhelp. It is all nicely indexed and cross-referenced. Much easier and quicker than the on-line docs. On Ubuntu devhelp can be installed with synaptic. I don't know how I got the docs themselves... probably came with the dev packages I installed?

[ericshliao]

Thanx. Just tried the 0.1.9 package. Working fine on my iLiad.
I also installed devhelp. I didn't know it until you mentioned. Quite convenient.