Goal

To provide an open-source alternative to the Docker image escalope/pandoc-mermaid-plantuml, whose Dockerfile isn’t available.

The rationale behind these difficult setup is simple: construct informative Mermaid diagram with intuitive Markdown syntax in an open-source and economic way.

This newly constructed Docker image is entirely on GitLab. No Docker Hub account is needed. For sample usage, consult .gitlab-ci.yml in my test project.

Difficulties

1. issues raghur/mermaid-filter#51 and #52
2. issue gitlab-org/gitlab-runner#4566

Useful code/articles

1. time-machine-project/requests-for-comments@470b0c5 Dockerfile
2. Reduce Docker Image Sizes Using Alpine
3. Best practices for building docker images with GitLab CI with the accompanying gist
4. The code block in the highlighted comment in item 2 of the above section
5. pandoc installation for Docker
6. Sample Dockerfile for Alpine Linux in the troubleshooting of Puppeteer
7. sc250024/docker-mermaid-cli@3c9ddb5 src/puppeteerConfigFile.json
8. raghur/mermaid-filter project README’s section about Puppeteer config file

Background

I lacked motivation to keep this tweaked theme up with Hugo’s development after last summer. When I came back yesterday, I saw that some pages using Font Awesome icons were broken. Apart from that, the ToC list level problem resurfaced.

Fixed ToC

The solution that I had adopted no longer worked. Luckily, some users provided a shorter code in the later discussions. The one from user501254 caught me. I first tried to copy his code into the partial layout for ToC. However, nothing changed.

GitHub Actions provide CI/CD support, which might interest many GitHub users. I’ve applied for this feature a week ago. Luckily, my application for the trial was approved by GitHub. Tonight, I’ve found the motivation for making my first step in my forked repo VincentTam/beautiful-jekyll.

My setup:

1. Clicked on the “Action” tab of the repo.
2. Chose the workflow file template for Jekyll.
3. Added a slash / in front of srv in chmod 777 srv/jekyll, so as to fix the “no such file or directory” error.
4. Added the parameter repository: {your repo name} in the site config file _config.yml.

The action should be successfully configured.

Background

I prefer including the date into the Permalink of a post. Everytime I create a new post, I type

hugo new post/$(date -I)-post-title.md

to ensure that the date is correct.

Problem

The title field in the post’s front matter contained the date, which wasn’t something that I wanted because it’s already shown next to the icon.

Observations

Neither \d nor [\d] works for the PCRE character class \d.

Motivation

The original navbar in words took up half of the horizontal spaces of the viewport. I couldn’t add new items like “Tags” to display the tag list.

Work

Thanks to the pre field in Hugo Menus, one can easily add the icon as an HTML element by some editing on the template file.

{{ range .Site.Menus.main.ByWeight }}
  {{ if .HasChildren }}
    <li class="navlinks-container">
      {{ if .Pre }}
        <a class="navlinks-parent" title="{{ .Name }}">{{ .Pre }}</a>
      {{ else }}
        <a class="navlinks-parent">{{ .Name }}</a>
      {{ end }}
      <div class="navlinks-children">
        {{ range .Children }}
          {{ if .Pre }}
            <a title="{{ .Name }}" href="{{ .URL | relLangURL }}">{{ .Pre }}</a>
          {{ else }}
            <a href="{{ .URL  | relLangURL }}">{{ .Name }}</a>
          {{ end }}
        {{ end }}
      </div>
    </li>
  {{ else }}
    <li>
      {{ if .Pre }}
        <a title="{{ .Name }}" href="{{ .URL | relLangURL }}">{{ .Pre }}</a>
      {{ else }}
        <a href="{{ .URL | relLangURL }}">{{ .Name }}</a>
      {{ end }}
    </li>
  {{ end }}
{{ end }}

When one changes connection type (say, from ethernet to Wi-Fi), the interface name changes (e.g. eth0 → wlan1). To avoid changing Conky config file all the time, here’s a little Lua function for finding the network interface name.

function findInterface()
    local handle = io.popen('ip a | grep "state UP" | cut -d: -f2 | tr -d " "')
    local result = handle:read('*a'):gsub('\n$','')
    handle:close()
    return result
end

1. ip a gives everything about connection info. Each entry looks like

    3: wlp3s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
   

2. Grep the “state UP” and extract the second field, using : as a delimiter. Trim off the spaces around.

   [Read More]

The official Staticman script sample depends on jQuery. I have been using jQuery in my Staticman script for nested comments for more than six months.

Recently, in the new release of Hugo Swift Theme, in which I’m a collaborator, one has removed all jQuery methods at commit f137efa4. Here’s the structure of the script:

1. auxiliary functions like elem, elems, pushClass, deleteClass, etc.
2. A self-executing function comments()
   • some necessary local variables
   • handleForm() consisting merely of an event listener handling form submission.
     • formToJSON(form) for converting the comment form to a JSON string.
     • fetch(url, {...}).then(...).catch(...) for submitting a sever request and handling its response. It calls showModal(...) and it contains resetForm().
   • a conditional form ? handleForm(form) : false; to execute the above method provided the existence of the comment form.
   • closeModal() and showModal() for closing and showing the modal respectively.
   • a conditional containsClass(body, show) ? closeModal() : false;.
   • a self-executing toogleForm() function. Nesting a self-executing function inside another one limits the namespace of variables. Even though there’s no new variable defined inside this function, there’s a need to wrap it with parenthesis () because toggleForm() is not called elsewhere, unlike toggleMenu(). If the if(button){...} statement comes out directly, we will not know that it’s doing.

Goal

To port Huginn’s Staticman integration to Introduction.

Difficulties

I’ve used some class names from Minimal Mistakes since the modals in the original code clashes with Introduction’s mobile responsive card display for projects. If I had know the practice of prepending a CSS class to avoid overiding the CSS properties of other components of a web site, I wouldn’t have mixed this Jekyll theme with my template for nested comments.

Due to my existing work on my SASS file for Staticman + Introduction, I had decided to continue working with the class names in this SASS file. Changing the CSS class names in the JS script was easier than doing so in the SASS file since I was more familiar with the former.

Background

I’m using Conky for monitoring the system. After a system upgrade, the CPU temperatures were gone. Conky’s standard error showed the following.

Conky: can't open '/sys/class/hwmon/hwmon0/temp3_input': No such file or
directory please check your device or remove this var from Conky...

Source of message: https://bbs.archlinux.org/viewtopic.php?id=82231

An easy fix would be to adjust the following lines in .conkyrc according to the number N in /sys/class/hwmon/hwmonN containing the file temp3_input. (You may adjust the number 3 according to the number of CPU of your device.) The number of CPU can be found using grep -c ^processor /proc/cpuinfo.

Background

I’ve to take screenshots to demonstrate Conky’s visual output.

I’ve chosen Byzanz after reading this answer on Ask Ubuntu.

Peek is more user-friendly, but I prefer CLI’s precision. That’s feasible thanks to a comment mentioning xwininfo.

After typing xwininfo, click on the target window. Switching to adjacent workplace is possible.

$ xwininfo
xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x1c0000a "Desktop"

  Absolute upper-left X:  0
  Absolute upper-left Y:  0
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1920
  Height: 1080
  Depth: 32
  Visual: 0x1a7
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x1c00009 (not installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +0+0  -0+0  -0-0  +0-0
  -geometry 1920x1080+0+0

The --x and --y parameters below correspond to the absolute upper-left position of the window.