mirror of
https://github.com/jbowdre/virtuallypotato.git
synced 2024-11-30 02:12:18 +00:00
64 lines
No EOL
2.6 KiB
Markdown
64 lines
No EOL
2.6 KiB
Markdown
---
|
|
series: Scripts
|
|
date: "2021-07-19T16:03:30Z"
|
|
usePageBundles: true
|
|
tags:
|
|
- linux
|
|
- shell
|
|
- regex
|
|
- jekyll
|
|
- meta
|
|
title: Script to update image embed links in Markdown files
|
|
toc: false
|
|
---
|
|
|
|
I'm preparing to migrate this blog thingy from Hashnode (which has been great!) to a [GitHub Pages site with Jekyll](https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/creating-a-github-pages-site-with-jekyll) so that I can write posts locally and then just do a `git push` to publish them - and get some more practice using `git` in the process. Of course, I've written some admittedly-great content here and I don't want to abandon that.
|
|
|
|
Hashnode helpfully automatically backs up my posts in Markdown format to a private GitHub repo so it was easy to clone those into a local working directory, but all the embedded images were still hosted on Hashnode:
|
|
|
|
```markdown
|
|
|
|
|
|
|
|
```
|
|
|
|
I wanted to download those images to `./assets/images/posts-2020/` within my local Jekyll working directory, and then update the `*.md` files to reflect the correct local path... without doing it all manually. It took a bit of trial and error to get the regex working just right (and the result is neither pretty nor elegant), but here's what I came up with:
|
|
|
|
```bash
|
|
#!/bin/bash
|
|
# Hasty script to process a blog post markdown file, capture the URL for embedded images,
|
|
# download the image locally, and modify the markdown file with the relative image path.
|
|
#
|
|
# Run it from the top level of a Jekyll blog directory for best results, and pass the
|
|
# filename of the blog post you'd like to process.
|
|
#
|
|
# Ex: ./imageMigration.sh 2021-07-19-Bulk-migrating-images-in-a-blog-post.md
|
|
|
|
postfile="_posts/$1"
|
|
|
|
imageUrls=($(grep -o -P '(?<=!\[)(?:[^\]]+)\]\(([^\)]+)' $postfile | grep -o -P 'http.*'))
|
|
imageNames=($(for name in ${imageUrls[@]}; do echo $name | grep -o -P '[^\/]+\.[[:alnum:]]+$'; done))
|
|
imagePaths=($(for name in ${imageNames[@]}; do echo "assets/images/posts-2020/${name}"; done))
|
|
echo -e "\nProcessing $postfile...\n"
|
|
for index in ${!imageUrls[@]}; do
|
|
echo -e "${imageUrls[index]}\n => ${imagePaths[index]}"
|
|
curl ${imageUrls[index]} --output ${imagePaths[index]}
|
|
sed -i "s|${imageUrls[index]}|${imagePaths[index]}|" $postfile
|
|
done
|
|
```
|
|
|
|
I could then run that against all of the Markdown posts under `./_posts/` with:
|
|
|
|
```bash
|
|
for post in $(ls _posts/); do ~/scripts/imageMigration.sh $post; done
|
|
```
|
|
|
|
And the image embeds in the local copy of my posts now all look like this:
|
|
|
|
```markdown
|
|
|
|
|
|
|
|
```
|
|
|
|
Brilliant! |