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b088086b06
Now, it's all under the notebook umbrella. Seems to be appropriate as it is just my notes after all. I also updated some notes from there. I didn't keep track of what it is this time. Something about more learning notes extracted from my "Learning how to learn" course notes and then some. Lack of time and hurriness just makes it difficult to track but it should be under version control already.
67 lines
1.6 KiB
Org Mode
67 lines
1.6 KiB
Org Mode
:PROPERTIES:
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:ID: 8750a413-7cb8-4160-b4b3-3b54265b2825
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:END:
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#+title: Percent encoding in Bash
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#+date: "2021-06-23 21:10:33 +08:00"
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#+date_modified: "2021-07-01 13:46:04 +08:00"
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#+language: en
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Percent-encoding is commonly used in URLs.
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Pretty nice especially when used with spaces.
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Based from [[https://gist.github.com/cdown/1163649][this implementation]].
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It was modified to be closer to the output from [[https://docs.python.org/3.8/library/urllib.parse.html#urllib.parse.urlencode][Python =urlencode=]].
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#+begin_src bash
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function urlencode {
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local msg=$1
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local length="${#1}"
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for (( i = 0; i < length; i++ )); do
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local ch="${msg:i:1}"
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case $ch in
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[a-zA-Z0-9.~_-])
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printf "%c" $ch;;
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,*)
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printf '%s' "$ch" | xxd -plain -cols 1 | {
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while read hex; do
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printf "%%%s" $hex
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done
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};;
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esac
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done
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printf "\n"
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}
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urlencode "El Doggo"
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urlencode "El Niño"
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urlencode "Whoa there, sonny!"
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#+end_src
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#+results:
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: ElDoggo
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: ElNiÃo
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: Whoatheresonny
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To decode percent-encoded strings:
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#+begin_src bash
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function urldecode {
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# urldecode <string>
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# Replace all pluses with spaces since it usually represents it in URLs.
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local url_encoded="${1//+/ }"
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# Replace all percent sign with '\x' and print the message with byte interpretation.
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printf '%b\n' "${url_encoded//%/\\x}"
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}
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urldecode "El%20Doggo"
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urldecode "%e9%bd%8b%e8%97%a4%e3%83%bbB%e3%83%bb%e6%a5%b5%e3%83%bb%e5%b0%86%e5%97%a3"
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#+end_src
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#+results:
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: El Doggo
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: 齋藤・ B ・極・将嗣
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