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Formatting: support syntax of sub string

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Fix #1256; Ref #1255
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李通洲
2024-09-11 11:07:00 +08:00
parent 68ab41f748
commit dc541ac781
3 changed files with 122 additions and 52 deletions
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src/data/help_format.txt
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@@ -17,6 +17,10 @@ In 2.23.0 or newer, `<` or `>` can be specified instead of `:` to set a left or
For example: "--title-format '{user-name<20}'" will generate `<user-name> `;
"--title-format '{user-name>20}'" will generate ` <user-name>`
In 2.24.0 or newer, `{~startIndex,endIndex}` can be specified to slice a string. Negative index counts back from the end of the string.
If an index is omitted, 0 is used. For example, both `{~,0}` `{~0,}` and `{~,}` are same as `{~0,0}` and will always generate a empty string.
If `,endIndex` is omitted or greater than the length of the string, the length of string is used.
If the value index is missing, meaning the placeholder is "{}", an internal counter sets the value index.
This means that the format string "Values: {1} ({2})" is equivalent to "Values: {} ({})".
Note that this counter only counts empty placeholders, so the format string "{2} {} {}" will contain the second value, then the first, and then the second again.