cosiner / flag Goto Github PK
View Code? Open in Web Editor NEWFlag is a simple but powerful command line option parsing library for Go support infinite level subcommand
License: MIT License
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How to end greedy-consume arguments?
Given:
type flags struct {
Something []string `names:"-s" usage:"pass in something(s)"`
Rest []string `args:"true"`
}
how does the user end the greedy consumption of -s and provide non-flag arguments? E.g., a common pattern in flag parsing libraries requires multi-value argument flags to be specified once for each argument:
cmd -s A -s B -s C XYZ
would produce len(a.Something) == 3 and a.Rest == []string{"XYZ"}. If multi-value arguments are greedy, len(a.Something) == 4 and a.Rest == []string{}.
How does a user pass in arguments to Rest with greedy consumption?
How deep can I nest the structs?
It looks like the 3rd nested structs aren't visible. Example:
type Arguments struct {
Index struct {
Enable bool
Full struct {
Enable bool
// This is not visible
List struct {
Enable bool
}
// This is not visible as well
Syncto struct {
Enable bool
Cassandra struct {
Enable bool
All bool `names:"--all" default:"true" desc:"Just sync everything from Redis to Cassandra"`
}
}
}
}
}
This is the error I got:
go run -race main.go index full list
StandaloneValue: standalone value without flag: [main index full] list
Permit sets with parametric values
For example:
command help set
If I've understood the library, is not possible to use this syntax
Unable to have negative value
This should work: go run main.go logs --from "-1d" /var/log/messages
But it doesn't. Here's the error log:
StandaloneFlag: standalone flag without values: [main logs].--from
Does this support implied flags, like tar?
'-' to ensure next argument must be a flag
That seems to imply that implied flags will work here the same as they do with tar:
tar -xvf test.tar.gz
tar xvf test.tar.gzIs that true?
Add support for mandatory flags
Hi,
Maybe I missed something, but I couldn't find a way to declare mandatory settings.
It would be great to have such feature implemented.
Regards
How do I know which subcommand is triggered?
I must be missing something simple here, let's say I have subcommands build and test.
How do I know if user ran build instead of test?
README example missing package name
Hi, I'm not sure how it compiles, but your example refers to flag.Flag as simply Flag, which was confusing on the first read. Otherwise, looks like a neat API and is currently on my shortlist for consideration :)
Add positional tag
Is a good idea add a tag for setting postitional arguments. For example:
type Args struct {
Version string `names:"-v" usage:"Version"`
Pos string `names:"positional" positional:"true" usage"positional flag"`
}Result would be:
Usage:
cmd [FLAG] [positional]...
Flags:
-v Version
-h, --help show help
Positional flags:
positional positional flag
4 level deep struct breaks again on the latest commit.
Works here: d92f27a
Stop working here: e5854e4
Example config struct:
type Arguments struct {
Config string `names:"-c" default:"." desc:"Path to config directory"`
Index struct {
Enable bool
Full struct {
Enable bool
List struct {
Enable bool
Unsynced bool `names:"--unsynced" default:"false" desc:"Display only unsynced metric indices"`
}
Syncto struct {
Enable bool
Storage struct {
Enable bool
Unsynced bool `names:"--unsynced" default:"false" desc:"Sync only unsynced metric indices"`
}
}
}
Short struct {
Enable bool
List struct {
Enable bool
Unsynced bool `names:"--unsynced" default:"false" desc:"Display only unsynced metric indices"`
}
Syncto struct {
Enable bool
Storage struct {
Enable bool
Unsynced bool `names:"--unsynced" default:"false" desc:"Sync only unsynced metric indices"`
}
}
}
}
}
Error:
go run main.go index short syncto storage
StandaloneValue: standalone value without flag: [main index short syncto] storage
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