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style-guide: refresh page: move ellipsis to a separate section and extend syntax (#9742)

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* Move and reword ellipsis to a separate section

* Add notes about grouping placeholders

* Permit specifing repetition count for placeholders

* Mandate using simplified range syntax for ellipsis

* Update contributing-guides/style-guide.md

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

* Remove redundant note

* Refresh repetition syntax for ellipsis

* Don't allow restrict repetition count via ellipsis

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
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Emily Grace Seville 2023-01-10 11:54:53 +10:00 • committed by GitHub
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contributing-guides/style-guide.md
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@ -160,6 +160,17 @@ All borders of integer and float ranges get included. If you want to exclude the
using `{{*.ext}}` explains the command without being unnecessarily specific;
while in `wc -l {{path/to/file}}` using `{{path/to/file}}` (without extension) is sufficient.
### Grouping placeholders
- If a command can take 0 or more arguments of the same kind, use an ellipsis: `{{placeholder1 placeholder2 ...}}`.
For instance, if multiple paths are expected `{{path/to/directory1 path/to/directory2 ...}}` can be used.
- If a command can take 0 or more arguments of different kinds, use an ellipsis: `{{placeholder1|placeholder2|...}}`.
If there are more than 5 possible values use `|...` after the last item.
- It's impossible to restrict the minimum or (and) maximum placeholder count via `ellipsis`.
It's up to the program to decide how to handle duplicating values, provided syntax
tells no info about whether items are mutually exclusive or not.
### Special cases
- If a command performs irreversible changes to a file system or devices,
@ -167,9 +178,6 @@ All borders of integer and float ranges get included. If you want to exclude the
For example, instead of `ddrescue --force --no-scrape /dev/sda /dev/sdb`
write `ddrescue --force --no-scrape {{/dev/sdX}} {{/dev/sdY}}`
and use the `{{/dev/sdXY}}` placeholder for *block devices* instead of `/dev/sda1`.
- If a command can take a variable number of arguments, use an ellipsis: `{{arg1 arg2 ...}}`.
If one of the multiple options is possible, write it as `{{either|or}}`.
If there are more than 5 alternatives, use `|...` for the ellipsis.
In general, placeholders should make it as intuitive as possible
to figure out how to use the command and fill it in with values.