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Ralsina.Me — El sitio web de Roberto Alsina

Publicaciones sobre python (publicaciones antiguas, página 86)

Nikola Can Parse That

Just for com­ple­te­ness' sake I ha­ve go­ne over Wiki­pe­dia's list of li­gh­twe­ight ma­rkup lan­gua­ges and added su­pport in Niko­la (a sta­tic si­te and blog ge­ne­ra­to­r) for a cou­ple of the­m: BB­Co­de and tx­t2­tags, whi­ch brings the num­ber of su­pported ma­rkup for­ma­ts to 7 (the others are reS­truc­tu­red tex­t, ma­rk­do­wn, HT­M­L, tex­ti­le and Wiki).

Of the list of ma­rkup lan­gua­ges, the on­ly mis­sing ones wi­th a Py­thon im­ple­men­ta­tion are As­ci­i­Doc and Ma­rk­do­wn Ex­tra.

Why bo­ther wi­th this? It's not as if the­re was so­meo­ne asking for BB­Co­de su­ppor­t. Ho­we­ve­r, one of the uses I want to su­pport is ar­chi­ving si­tes. Su­ppo­se you ha­ve a fo­rum you want to shut do­wn? I want you to be able to ar­chi­ve it (e­ven if it's so­me wo­rk) and keep the da­ta out the­re. A wiki? Sa­me thin­g.

This is a first step in that di­rec­tio­n.

Haceme Hablar

Una co­sa que me ha ayu­da­do a ser me­nos tí­mi­do, y po­der pro­gre­sar en la vi­da, es ha­blar en pú­bli­co. Pe­ro es­te úl­ti­mo par de años lo ven­go ha­cien­do po­co.

Así que, há­gan­me ha­blar má­s. Me gus­ta­ria ha­cer­lo en lu­ga­res en los que nun­ca es­tu­ve. Si no es ho­rri­ble­men­te le­jos de Bue­nos Ai­res ca­paz que ni te pi­do que pa­gues via­je y/o es­ta­dia, si el even­to es in­te­re­san­te o el lu­gar es co­pa­do, lo pa­go yo.

Pue­do ha­blar de py­tho­n, so­ftwa­re li­bre en ge­ne­ra­l, o de otras co­sas que me su­gie­ran, en in­glés o ar­gen­tino.

Adding Support for a Markup to Nikola

One of the goals for Niko­la, my sta­tic si­te/­blog ge­ne­ra­tor is that it should be ea­sy to ex­ten­d. For exam­ple, to­day I added su­pport for two ma­rkup­s: tex­ti­le and Creo­leWiki.

Sin­ce Niko­la al­ready su­pported HT­M­L, reS­truc­tu­re­dText and Ma­rk­do­wn, adding a cou­ple mo­re is not ve­ry di­ffi­cul­t. He­re's ho­w:

  1. Crea­­te a .plu­­gin fi­­le like this one:

[Core]
Name = textile
Module = compile_textile

[Documentation]
Author = Roberto Alsina
Version = 0.1
Website = http://nikola.ralsina.me
Description = Compile Textile into HTML

Then you need to crea­te a py­thon mo­du­le ca­lled (in this ca­se) com­pi­le_­tex­ti­le.­py

That fi­le is boi­ler­pla­te plus two me­tho­d­s, com­pi­le_ht­ml and crea­te_­post

The com­pi­le_ht­ml me­thod takes two ar­gu­men­ts, one fi­le from whi­ch it rea­ds the ma­rku­p, and one to wri­te HT­M­L. Exam­ple:

def compile_html(self, source, dest):
    if textile is None:
        raise Exception('To build this site, you need to install the "textile" package.')
    try:
        os.makedirs(os.path.dirname(dest))
    except:
        pass
    with codecs.open(dest, "w+", "utf8") as out_file:
        with codecs.open(source, "r", "utf8") as in_file:
            data = in_file.read()
        output = textile(data, head_offset=1)
        out_file.write(output)

Make su­re to use utf8 eve­r­yhe­re.

The crea­te_­post func­tion is us­ed to crea­te a new, emp­ty, post wi­th so­me me­ta­da­ta in it. Exam­ple:

def create_post(self, path, onefile=False, title="", slug="", date="", tags=""):
    with codecs.open(path, "wb+", "utf8") as fd:
        if onefile:
            fd.write('<notextile>  <!--\n')
            fd.write('.. title: %s\n' % title)
            fd.write('.. slug: %s\n' % slug)
            fd.write('.. date: %s\n' % date)
            fd.write('.. tags: %s\n' % tags)
            fd.write('.. link: \n')
            fd.write('.. description: \n')
            fd.write('--></notextile>\n\n')
        fd.write("\nWrite your post here.")

The me­ta­da­ta has to be in the form ".. field­na­me: fiel­d­va­lue" and usua­lly nee­ds to be wra­pped in a co­m­ment so that it's not sho­wn in the ou­tpu­t.

The one­fi­le pa­ra­me­ter means you ha­ve to wri­te that me­ta­da­ta in the pos­t. If it's Fal­se, you do­n'­t.

In so­me ra­re ca­ses (Creo­le, I am looking at you) co­m­men­ts are not su­pported and you should rai­se an ex­cep­tion if one­fi­le is True.

And tha­t's it, ma­rkup su­pport is fair­ly ea­sy to add as long as the­re is a py­thon im­ple­men­ta­tion of a func­tion to con­vert ma­rkup in­to ht­m­l.

Client-rendered, one-URL, dynamic, static site.

My va­ca­tions end to­mo­rro­w. So, the ti­me to spend ha­cking fun, per­so­na­l, free stu­ff is going to be li­mited be­cau­se of the ti­me spent co­ding fun, free stu­ff for mo­ney. So, I de­ci­ded to fi­nish wi­th a bit of whi­ms­y.

I im­ple­men­ted a com­ple­te­ly clien­t-­ren­de­re­d, one-UR­L, dy­na­mic blo­g. Whi­ch is ac­tua­lly to­ta­lly sta­ti­c.

In fac­t, that blog is this blo­g, just wi­th a twis­t. If you go to this URL you wi­ll see wha­t's ba­si­ca­lly this ve­ry si­te, wi­th co­m­men­ts and eve­r­y­thing as usua­l. But if you cli­ck on "Pre­vious Pos­t" ... we­ll, it sta­ys in the sa­me pa­ge, even thou­gh it dis­pla­ys a di­ffe­rent post :-)

The ma­gic is the new, ex­pe­ri­men­ta­l, dy­na­mic ta­sk_­mus­ta­che plu­gin for my sta­tic si­te ge­ne­ra­to­r, Niko­la. whi­ch does the fo­llo­win­g:

  1. Ren­­ders post da­­ta as JSON fi­­les in­s­­tead of HT­­ML

  2. Crea­­tes a HT­­ML fi­­le that is rea­­lly a mus­­ta­­che.­­js te­m­­pla­­te

  3. Crea­­tes a HT­­ML fi­­le wi­­th so­­­me bi­­ts of Ja­­va­s­­cript that loads the te­m­­pla­­te and the newest po­s­­t's da­­ta.

  4. If you ac­­ce­ss that mus­­ta­­che.h­t­­ml wi­­th a fra­g­­men­­t, it uses that to fe­­tch JSON da­­ta and rew­­ri­­te itse­l­­f.

And tha­t's it. It ac­tua­lly loads fas­t, and re­ge­ne­ra­tes ve­ry fas­t, sin­ce it does mu­ch le­ss than the real si­te. The­re are a bun­ch of things that wi­ll dump you out of the "d­y­na­mi­c" si­te, like tag li­nks, and whate­ve­r, but it wo­rks sur­pri­sin­gly we­ll (and if you want to the­me it, it's just one tem­pla­te).

This is the first of a new kind of thing for Nikola, the "extra plugins". Basically, stuff that is too weird, specific or useless for the general distro, will go there, and to use those plugins, you have to create a plugins/ folder in your site and add it there manually.

En­jo­y!


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