From aeff37dfa678d54701035d69aed676300e7d0345 Mon Sep 17 00:00:00 2001 From: Collin Lefeber Date: Mon, 17 Jun 2024 19:52:21 -0400 Subject: [PATCH] build-a-blog --- .build.yml | 16 +- .gitignore | 2 + chalk.min.css | 7 + highlight.js.min.css | 9 + highlight.min.js | 1213 +++++++++++++++++++++++++++++++++ index.html => index.html.tmpl | 7 +- index.xml | 522 ++++++++++++++ index.xml.tmpl | 12 + main.py | 140 ++++ posts/build_a_blog.md | 647 ++++++++++++++++++ style.css | 31 + 11 files changed, 2598 insertions(+), 8 deletions(-) create mode 100644 .gitignore create mode 100644 chalk.min.css create mode 100644 highlight.js.min.css create mode 100644 highlight.min.js rename index.html => index.html.tmpl (84%) create mode 100644 index.xml create mode 100644 index.xml.tmpl create mode 100644 main.py create mode 100644 posts/build_a_blog.md diff --git a/.build.yml b/.build.yml index d0f190b..8b3b3fb 100644 --- a/.build.yml +++ b/.build.yml @@ -1,13 +1,17 @@ +--- image: alpine/edge oauth: pages.sr.ht/PAGES:RW packages: -- hut + - hut + - python3 + - py3-markdown environment: site: cfebs.srht.site dest: cfebs.com tasks: -- package: | - cd $site - tar -cvz . > ../site.tar.gz -- upload: | - hut pages publish -d $dest site.tar.gz + - package: | + cd $site + python3 ./main.py + tar -cvz . > ../site.tar.gz + - upload: | + hut pages publish -d $dest site.tar.gz diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..77c8812 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +index.html +posts/*.html diff --git a/chalk.min.css b/chalk.min.css new file mode 100644 index 0000000..a7bbe07 --- /dev/null +++ b/chalk.min.css @@ -0,0 +1,7 @@ +/*! + Theme: Chalk + Author: Chris Kempson (http://chriskempson.com) + License: ~ MIT (or more permissive) [via base16-schemes-source] + Maintainer: @highlightjs/core-team + Version: 2021.09.0 +*/pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{color:#d0d0d0;background:#151515}.hljs 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c.pop(),c.push(i),r.contains=c,{name:"YAML",case_insensitive:!0, +aliases:["yml"],contains:l}}});const He=ae;for(const e of Object.keys(Ke)){ +const n=e.replace("grmr_","").replace("_","-");He.registerLanguage(n,Ke[e])} +return He}() +;"object"==typeof exports&&"undefined"!=typeof module&&(module.exports=hljs); \ No newline at end of file diff --git a/index.html b/index.html.tmpl similarity index 84% rename from index.html rename to index.html.tmpl index 39f33bc..b774837 100644 --- a/index.html +++ b/index.html.tmpl @@ -3,9 +3,10 @@ - cfebs.com + cfebs.com${more_title} + +
+
+
+
  • + A new post + +
  • + Build-a-blog +``` + +Not bad! + +### Post templating + +I think I want my blog to just maintain the overall layout from the index page and just render the post body where the main post list is. + +So lets make that template rendering a bit more general. + +We'll redefine the content area template variable to replace as `${content}` too. + +```python +def render_template(tpl_fname, out_fname, content_html): + with open(tpl_fname, 'r', encoding='utf-8') as inf: + tmpl = Template(inf.read()) + + html = tmpl.substitute(content=content_html) + + with open(out_fname, 'w', encoding='utf-8') as outf: + outf.write(html) + +def render_index(posts): + content_html = posts_list_html(posts) + render_template('index.html.tmpl', 'index.html', content_html) + outf.write(out) +``` + +And now adjust where posts are written out. + +```python +def render_post(fpath): + ... + out = markdown.markdown('# ' + title) + out + logging.info("writing to %s", destpath) + render_template('index.html.tmpl', destpath, html) +``` + +After running you should see the each `post/*.html` file where each post file uses the full index template and includes each generated post HTML. + +### Post sorting + +With everything wired up now we just need to sort the posts lists by the date metadata. + +Lets do a bit of python repl sort testing because I never remember `datetime` usage. + +Lets generate a few nicely formatted ISO date strings for testing. + +```shell +❯ date -d'2023-01-01' -Is +2023-01-01T00:00:00-05:00 +❯ date -Is +2024-06-17T16:30:35-04:00 +``` + +And make a test array + +```python +>>> posts = [{'date': '2023-01-01T00:00:00-05:00'}, {'date': '2024-06-17T16:30:35-04:00'}] +``` + +With our current script, the older post would be listed first. So lets try a sort. + +``` +# Double checking datetime parsing +>>> import datetime +>>> newer = datetime.datetime.fromisoformat('2024-06-17T16:30:35-04:00') +datetime.datetime(2024, 6, 17, 16, 30, 35, tzinfo=datetime.timezone(datetime.timedelta(days=-1, seconds=72000))) +>>> older = datetime.datetime.fromisoformat('2024-06-17T16:30:35-04:00') +datetime.datetime(2024, 6, 17, 16, 30, 35, tzinfo=datetime.timezone(datetime.timedelta(days=-1, seconds=72000))) + +# Checking python sorting methods work as expected +>>> newer.__gt__(older) +True +>>> newer.__lt__(older) +False +>>> older.__gt__(newer) +False +>>> older.__lt__(newer) +True + +# Doing the sort +>>> sorted(posts, key=lambda x: datetime.datetime.fromisoformat(x['date']), reverse=True) +[{'date': '2024-06-17T16:30:35-04:00'}, {'date': '2023-01-01T00:00:00-05:00'}] +``` + +Now lets apply this to our posts. + +```python +if __name__ == '__main__': + posts = render_posts() + logging.info('rendered posts: %s', posts) + sorted_posts = sorted(posts, + key=lambda p: datetime.datetime.fromisoformat(p['date']), reverse=True) + render_index(sorted_posts) +``` + +### `` Templating + +The last bit of templating is to make each post `<title>` different. + +I'll try something like `<title>cfebs.com - ${title}` + +So `index.html.tmpl` + +```html +cfebs.com${more_title} +``` + +And where we're using the title template `more_title` will default to empty string. + +```python +def render_index(posts): + content_html = posts_list_html(posts) + render_template('index.html.tmpl', 'index.html', {'content': content_html, 'more_title': ''}) +``` + +But for a post: + +```python +def render_post(fpath): + ... + title = md.Meta.get('title')[0] + date = md.Meta.get('date')[0] + + out = markdown.markdown('# ' + title) + out + + logging.info("writing to %s", destpath) + render_template('index.html.tmpl', destpath, {'content': out, 'more_title': ' - ' + title}) +``` + +At this point we have functioning blog post generation with templating. + + +## RSS + +This should be pretty easy as RSS is just reformatting our blog index list into different XML. + +The `render_template` function will be useful here with a few more tweaks. So I'll make another template file (based off a reference ) + +```shell +# Grab the reference +❯ curl -sL 'https://drewdevault.com/blog/index.xml' > index.xml.example + +# After a bit of editing +❯ cat ./index.xml.tmpl + + + + ${site_title} + ${site_link} + ${description} + en + ${last_build_date} + + ${items} + + +``` + +`render_template` now gets even more generic and passes a `dict` to `Template.substitute()` + +```python +def render_template(tpl_fname, out_fname, subs): + with open(tpl_fname, 'r', encoding='utf-8') as inf: + tmpl = Template(inf.read()) + + out = tmpl.substitute(subs) + + with open(out_fname, 'w', encoding='utf-8') as outf: + outf.write(out) +``` + +And make sure to adjust any usages of `render_template` that exist. + +```python +def render_index(posts): + content_html = posts_list_html(posts) + render_template('index.html.tmpl', 'index.html', {'content': content_html}) + +def render_post(fname): + ... + render_template('index.html.tmpl', destpath, {'content': out, 'more_title': ' - ' + title}) +``` + +And now we can hack away at RSS generation: + +``` +def render_rss_index(posts): + subs = { + 'site_title': 'cfebs.com', + 'site_link': 'https://cfebs.com', + 'self_full_link': 'https://cfebs.com/index.xml', + 'description': 'Recent content from cfebs.com', + 'last_build_date': 'TODO', + 'items': 'TODO', + } + render_template('index.xml.tmpl', 'index.xml', subs) +``` + +After this initial test and a `python3 ./main.py` run, we should see xml filled out. + +``` +❯ cat ./index.xml + + + + cfebs.com + https://cfebs.com + Recent content from cfebs.com + en + TODO + + TODO + + +``` + +Now lets finish up by generating each item entry and collecting them to be replaced in the template. + +```python +def rss_post_xml(post): + tpl = """ + + {title} + {link} + {pubdate} + {link} + {description} + + """ + + with open(post['fpath'], 'r') as inf: + text = inf.read() + + md = markdown.Markdown(extensions=['extra', 'meta']) + converted = md.convert(text) + + link = "https://cfebs.com/" + post['destpath'] + pubdate = email.utils.format_datetime(datetime.datetime.fromisoformat(post['date'])) + subs = dict(title=post['title'], link=link, + pubdate=pubdate, + description=converted) + + for k,v in subs.items(): + subs[k] = html.escape(v) + + return tpl.format(**subs) + +def render_rss_index(posts): + items = '' + for post in posts[:5]: + items += rss_post_xml(post) + + subs = { + 'site_title': 'cfebs.com', + 'site_link': 'https://cfebs.com', + 'self_full_link': 'https://cfebs.com/index.xml', + 'description': 'Recent content from cfebs.com', + 'last_build_date': email.utils.format_datetime(datetime.datetime.now()), + } + for k,v in subs.items(): + subs[k] = html.escape(v) + + subs['items'] = items + render_template('index.xml.tmpl', 'index.xml', subs) +``` + +* Need to use `html.escape` anywhere we could have quotes or HTML tags in output. +* `posts[:5]` should always take the most recent 5 posts to add to the RSS feed. + +## Wrapping up + +Reached the end of the afternoon, so this is where I'll leave it. + +It's not great software. + +* No tests, no docs +* No input validation +* Hard coding values like the domain +* Using adhoc dicts for generic structures +* Relies on system python version and packages. +* Does not offer anything a tool like [hugo][hugo] does not already offer. + +But, it's ~150 lines of python with 1 external dependency. + +If python or `python-markdown` drastically changes, it'll probably take <10 minutes to debug. + +And - it was fun to write and write about. + +View the complete source for generating this blog: + +* [main.py](https://git.sr.ht/~cfebs/cfebs.srht.site/tree/main/item/main.py) +* [index.html.tmpl](https://git.sr.ht/~cfebs/cfebs.srht.site/tree/main/item/index.html.tmpl) +* [index.xml.tmpl](https://git.sr.ht/~cfebs/cfebs.srht.site/tree/main/item/index.xml.tmpl) + +Or the full repo tree: + +[1]: https://crystal-lang.org/ +[2]: https://github.com/crystal-lang/crystal/releases/tag/0.31.0 +[3]: https://pkgs.alpinelinux.org/package/edge/main/x86_64/py3-markdown +[4]: https://python-markdown.github.io/ +[5]: https://archlinux.org/packages/extra/any/python-markdown/ +[hugo]: https://gohugo.io/ diff --git a/style.css b/style.css index 915eba6..f5bc84d 100644 --- a/style.css +++ b/style.css @@ -10061,3 +10061,34 @@ dl dd { padding-left: 0; padding-right: 0 } + +/* custom */ +h1, +.h1 { + font-size: 1.5rem; +} + +h2, +.h2 { + font-size: 1.25rem; +} + +h3, +.h3 { + font-size: 1.2rem; +} + +h4, +.h4 { + font-size: 1.1rem; +} + +h5, +.h5 { + font-size: 1.15rem; +} + +h6, +.h6 { + font-size: 1rem +}