mirror of
https://github.com/jbowdre/runtimeterror.git
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64 lines
2.6 KiB
Markdown
64 lines
2.6 KiB
Markdown
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---
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series: Scripts
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date: "2021-07-19T16:03:30Z"
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usePageBundles: true
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tags:
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- linux
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- shell
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- regex
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- jekyll
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- meta
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title: Script to update image embed links in Markdown files
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toc: false
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---
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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.
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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:
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```markdown
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```
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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:
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```bash
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#!/bin/bash
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# Hasty script to process a blog post markdown file, capture the URL for embedded images,
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# download the image locally, and modify the markdown file with the relative image path.
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#
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# Run it from the top level of a Jekyll blog directory for best results, and pass the
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# filename of the blog post you'd like to process.
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#
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# Ex: ./imageMigration.sh 2021-07-19-Bulk-migrating-images-in-a-blog-post.md
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postfile="_posts/$1"
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imageUrls=($(grep -o -P '(?<=!\[)(?:[^\]]+)\]\(([^\)]+)' $postfile | grep -o -P 'http.*'))
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imageNames=($(for name in ${imageUrls[@]}; do echo $name | grep -o -P '[^\/]+\.[[:alnum:]]+$'; done))
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imagePaths=($(for name in ${imageNames[@]}; do echo "assets/images/posts-2020/${name}"; done))
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echo -e "\nProcessing $postfile...\n"
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for index in ${!imageUrls[@]}; do
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echo -e "${imageUrls[index]}\n => ${imagePaths[index]}"
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curl ${imageUrls[index]} --output ${imagePaths[index]}
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sed -i "s|${imageUrls[index]}|${imagePaths[index]}|" $postfile
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done
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```
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I could then run that against all of the Markdown posts under `./_posts/` with:
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```bash
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for post in $(ls _posts/); do ~/scripts/imageMigration.sh $post; done
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```
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And the image embeds in the local copy of my posts now all look like this:
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```markdown
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```
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Brilliant!
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