Impossible to print command-line options in same order as added
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Key: CLI-212
URL: https://issues.apache.org/jira/browse/CLI-212
Project: Commons CLI
Issue Type: Bug
Components: Help formatter
Affects Versions: 1.2
Reporter: Per Cederberg
Using the current HelpFormater and Options classes it is impossible to print
command-line options in the same order as they were added.
In some applications this is critical, since option grouping is important for
understanding how to use a program. Also, the programmer might have good
reasons for adding options in a particular order. The default could remain
printing sorted options, however.
Two small changes need to be made to allow this:
1. Change to use LinkedHashMap instead of HashMap in Options class:
private Map shortOpts = new LinkedHashMap(); // keeps original order by
default
private Map optionGroups = new LinkedHashMap();
2. Change the "null" formatter option in HelpFormatter to actually skip sorting:
public void setOptionComparator(Comparator comparator)
this.optionComparator = comparator; // allow null values, default
ordering
}
Fix #2 above isn't strictly necessary, but would avoid forcing users to create
boiler-plate code for this.
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