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59 lines
No EOL
2 KiB
Markdown
59 lines
No EOL
2 KiB
Markdown
---
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date: 2022-12-18 13:05:49-05:00
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draft: false
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math: false
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medium_enabled: true
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medium_post_id: 913b5fa85507
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tags: ["Blogging"]
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title: Blogroll From Subscriptions
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---
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While I was browsing around personal websites, I found a fun little piece of code from Jake Bauer's [links page](https://www.paritybit.ca/links).
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```bash
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grep "xmlUrl" static/subscriptions.opml |\
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sed 's/.*text=\"\(.*\)\" xmlUrl=\"\(https\?:\/\/[^\/]*\/\)\(.*\)\" .*/<li><a href=\"\2\">\1<\/a> (<a href=\"\2\3\">feed<\/a>)<\/li>/g'
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```
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This takes the subscriptions exported from [yarr](https://github.com/nkanaev/yarr) and generates a HTML list which you can then include in a blogroll page.
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Running this script on my export from [Feedbin](https://feedbin.com/) yielded some extra metadata being shown in the HTML. For example: `Joke Bauer type="rss" (Feed)`. So let's edit the code snippet above so that it works for my subscription export.
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From my `subscriptions.xml` here's an example entry:
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```xml
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<outline text="Jake Bauer" title="Jake Bauer" type="rss" xmlUrl="https://www.paritybit.ca/feed.xml" htmlUrl="https://www.paritybit.ca/"/>
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```
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It looks like I need to extract the `title`, `xmlUrl`, and `htmlUrl` attributes in that specific order. I'll use the same technique from a previous post on [capturing quoated strings](/capturing-quoted-string-sed).
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```bash
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grep "xmlUrl" subscriptions.xml |\
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sed 's/.*title=\"\([^\"]*\)\".*xmlUrl=\"\([^\"]*\)\".*htmlUrl=\"\([^\"]*\)\".*/<li><a href=\"\3\">\1<\/a> (<a href=\"\2\">feed<\/a>)<\/li>/g'
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```
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We can then clean this up into a `create_blogroll` script saved within [`~/.local/bin`](/blog/customexec/).
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```bash
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#!/bin/sh
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set -o errexit
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set -o nounset
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show_usage() {
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echo "Usage: create_blogroll [subscriptions.xml]"
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exit 1
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}
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# Check argument count
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if [ "$#" -ne 1 ]; then
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show_usage
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fi
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QUOTED_STR="\"\([^\"]*\)\""
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XML_EXPR=".*title=$QUOTED_STR.*xmlUrl=$QUOTED_STR.*htmlUrl=$QUOTED_STR.*"
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HTML_EXPR="<li><a href=\"\3\">\1<\/a> (<a href=\"\2\">feed<\/a>)<\/li>"
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REPLACE_EXPR="s/$XML_EXPR/$HTML_EXPR/g"
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grep "xmlUrl" "$1" | sed "$REPLACE_EXPR"
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``` |