octoleo/telegram-bot-bash
1
1
Fork 0
mirror of https://github.com/octoleo/telegram-bot-bash.git synced 2024-11-22 15:35:09 +00:00
Code Issues Projects Releases Wiki Activity

doc: unify use of locale, range and utf

Browse Source
This commit is contained in:
Kay Marquardt (Gnadelwartz) 2021-01-04 17:00:55 +01:00
parent 8162695451
commit 0d678f4234
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
doc/4_expert.md
View File

@ -38,10 +38,10 @@ export 'LANGUAGE=en_US.UTF-8'
#### Known locale pitfalls
##### Missing locale C
##### Missing C locale
Even required by POSIX standard some systems (e.g. Manjaro Linux) has no locale `C` and `C.UTF-8` installed.
If bashbot display a warning about missing locale you must install locale `C` and `C.UTF-8`.
Even required by POSIX standard some systems (e.g. Manjaro Linux) has `C` and `C.UTF-8` locale not installed.
If bashbot display a warning about missing locale you must install `C` and `C.UTF-8` locale.
If you don't know what locales are installed on your sytsem use `locale -a` to display them.
[Gentoo Wiki](https://wiki.gentoo.org/wiki/UTF-8).
@ -50,9 +50,9 @@ If you don't know what locales are installed on your sytsem use `locale -a` to d
##### Character classes
In ASCII times it was clear `[:lower:]` and `[a-z]` means ONLY the lowercase letters `[abcd...xyz]`.
With introdution of locales character classes and ranges contains every character fitting the class definition.
With introdution of localesi, character classes and ranges contains all charatcers fitting the class definition.
This means for UTF-8 locales `[:lower:]` and `[a-z]` contains ALL lowercase letters, e.g. `á ø ü` also,
This means with a Latin UTF-8 locale `[:lower:]` and `[a-z]` contains also e.g. `á ø ü` etc,
see [Unicode Latin lowercase letters](https://www.fileformat.info/info/unicode/category/Ll/list.htm)
If that's ok for your script your'e fine, but many scripts rely on the idea of ASCII ranges and may produce undesired results.
@ -63,7 +63,7 @@ If that's ok for your script your'e fine, but many scripts rely on the idea of A
bash
lower="abcö"
echo "$LC_ALL"
echo "$LC_ALL $LC_COLLATE"
[[ "$lower" =~ ^[a-z]+$ ]] && echo "Ups, $lower is all lower case!" || echo "OK, not lower case"
LC_ALL="en_US.UTF-8"
@ -80,7 +80,7 @@ There are three solutions:
3. use `LC_COLLATE` to change behavior of all programs: `export LC_COLLATE=C`
To work independent of language and bash settings bashbot uses solution 1. and uses own "classes" if an exact match is mandatory:
To work independent of language and bash settings bashbot uses solution 1.: Own "ranges" if an exact match is mandatory:
```bash
azazaz='abcdefghijklmnopqrstuvwxyz' # a-z :lower:
@ -434,5 +434,5 @@ for every poll until the maximum of BASHBOT_SLEEP ms.
#### [Prev Advanced Use](3_advanced.md)
#### [Next Best Practice](5_practice.md)
#### $$VERSION$$ v1.21-7-g0798f1a
#### $$VERSION$$ v1.25-dev-1-g8162695