Arkib Nota

bersama catatan peribadi & teknikalnya.

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Combining/Merging Pictures with ImageMagick
Connect to WiFi with wpa_supplicant
Displaying Codes Behind A Symbol In Pygments
Grub2 Menuentry for Chainloading FreeBSD-UEFI
Perubahan Hari Kepada Kalendar Hijrah
Mengatasi Kegagalan Git Ketika Menambah Submodule

Combining/Merging Pictures with [ImageMagick]

Left-to-Right:

convert +append -background black image1.jpg image2.jpg output.jpg

Top-to-Bottom:

convert -append -background black image1.jpg image2.jpg output.jpg

EXAMPLE of merging photos with borders and centered position:-

convert +append -background black -border 1 -bordercolor white -gravity center image1.jpg image2.jpg output.jpg

Connect to WiFi with wpa_supplicant
This is somehow a primitive method for connecting to a wireless network but I just prefer doing it this way. Please refer to step number (i) and (ii) if you are running it for the first time. Otherwise, skip to step number (iii).
As a root:-
1. Ensure that wifi is unblocked:-
  rfkill unblock wifi
2. Enable wpa_supplicant.service and dhcpcd.service:-
  systemctl enable --now wpa_supplicant.service && \ systemctl enable --now dhcpcd.service
3. Connect with wpa_supplicant:-
  wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf
4. Totally kill the wpa_supplicant process should you need to connect to a different network:-
  killall wpa_supplicant
  Repeat step number (iv) above with different configuration of the network details.
Provided below is an example of a simple valid wpa_supplicant.conf file:-
```
ctrl_interface=/run/wpa_supplicant
update_config=1
ap_scan=1
fast_reauth=1
country=MY

network={
	ssid="MYSSID"
	psk="passphrase"
}
```

Rujukan: wpa_supplicant | ArchWiki

Displaying Codes Behind A Symbol In Pygments
The good thing about syntax highlighting with Pygments is that we do not have to use HTML Escape in order to display a character/symbol in our codes.
However, I believe that there may be times when we need to present the code behind such character/symbol in our highlighted codes. So, here is the tip to have this purpose done:
Let's say we need to have this '' character code shown in our highlighted codes. All we need to do is to replace the <&> symbol with its HTML escape which is <&>. In this case, the code behind the symbol used in this example is <⌘>. So in our code writing, we should type it this way; <&#8984;>.
Rujukan: place of interest sign (U+2318)

Grub2 Menuentry for Chainloading FreeBSD-UEFI

menuentry 'FreeBSD 11.1' {
    insmod ufs2
    set root=(hd0,gpt10)
    chainloader /boot/boot1.efi
}

Rujukan: fighting with grub2

Perubahan Hari Kepada Kalendar Hijrah
Ada masanya hari pada Kalendar Hijrah akan berubah kerana pengiraan dibuat berdasarkan kemunculan bulan atau dalam istilah Inggerisnya dipanggil 'lunar calendar'. Jadi akan ada keperluan untuk menyunting dua fail ini; satu untuk dipamerkan pada ^[i] conky dengan konfigurasi dalam bahasa python dan satu lagi untuk dipamerkan di weblog ini melalui ^[ii] skripjava.
1. Suntingan pada fail hijri.py dari pakej ummalqura:-
  #id = mcjdn - UmalqurraArray.ummalqura_dat[index - 1] + 1 # komen baris asal id = mcjdn - UmalqurraArray.ummalqura_dat[index - 1] + 0 # tambah baris baru
2. Suntingan pada fail moment-hijri.js:-
  //hd = mjdn - ummalqura.ummalquraData[i - 1] + 1 # komen baris asal hd = mjdn - ummalqura.ummalquraData[i - 1] + 0 # tambah baris baru
Mengatasi Kegagalan Git Ketika Menambah Submodule
Saya terima ralat ketika cuba menambah submodule public untuk git melalui baris perintah berikut, ie.:-
```
git submodule add -b master git@github.com-web:saya/saya.github.io.git public
```
Ralat yang diterima adalah:-
```
Cloning into '$HOME/hugo/blog/public'...
Enter passphrase for key '$HOME/.ssh/id_rsa.web': 
warning: You appear to have cloned an empty repository.
fatal: 'origin/master' is not a commit and a branch 'master' cannot be created from it
Unable to checkout submodule 'public'
```
Jadi saya berjaya selesaikan masalah ini melalui pembacaan di [halaman ini].
Langkah-langkah yang perlu dibuat adalah:-
1. Periksa sekiranya origin ada ditetapkan dengan menjalankan baris perintah seperti di bawah:-
  git remote -v
  Jika tiada apa-apa input yang keluar, tinggalkan langkah kedua dan teruskan dengan langkah ketiga diikuti langkah-langkah berikutnya.
  Jika mendapat keputusan seperti ini,
```
origin	git@github.com-blog:saya/blog.git (fetch)
origin	git@github.com-blog:saya/blog.git (push)
```
  teruskan dengan langkah kedua sehingga akhir.
2. Singkirkan tetapan remote yang lama dengan baris perintah berikut:-
  git remote remove origin
3. Kemudian bolehlah menambah remote yang betul dengan:-
  git remote add origin git@github.com-blog:saya/blog.git
4. Dan akhir sekali, tambahkan submodule:-
  git submodule add -b master git@github.com-web:saya/saya.github.io.git public
  Maklum balas yang sepatutnya diterima adalah seperti ini:-
```
Adding existing repo at 'public' to the index
```

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