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flag: impossible to override the CommandLine usage #7779

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gopherbot opened this issue Apr 14, 2014 · 5 comments
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flag: impossible to override the CommandLine usage #7779

gopherbot opened this issue Apr 14, 2014 · 5 comments
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Go1.4

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@gopherbot
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by jonas@pfenniger.name:

The flag package special-cases the usage for the default flag.CommandLine FlagSet. It
makes it impossible to override the module-level usage.

See: http://golang.org/src/pkg/flag/flag.go?s=22406:22467#L703

The flag.Usage() could be set to the flag.CommandLine in an init() instead.
@ianlancetaylor
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Comment 1:

Labels changed: added repo-main, release-go1.4.

@rsc
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rsc commented Sep 15, 2014

Comment 2:

Can you please point to specific code? I can't tell what the problem is.
Note that you can reassign flag.Usage in your func main.

Status changed to WaitingForReply.

@gopherbot
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Comment 3 by jonas@pfenniger.name:

Sorry for the confusion.
It's possible to set flag.Usage and have a different usage output. What's not possible
it to pass in CommandLine into a flagset-configuring function and have the usage
updated. Here is an example: http://play.golang.org/p/uaycqgIurf
Arguably this is a nitpick. The FlagSet usage() function could be changed to something
like this to support both cases: https://gist.github.com/zimbatm/e652a0e7342833d73f99

@gopherbot
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Comment 4:

CL https://golang.org/cl/147210043 mentions this issue.

@robpike
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robpike commented Sep 26, 2014

Comment 5:

This issue was closed by revision b2487ef.

Status changed to Fixed.

@rsc rsc added this to the Go1.4 milestone Apr 14, 2015
@rsc rsc removed the release-go1.4 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 25, 2016
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jun 25, 2018
@robpike @wheatman
flag: allow CommandLine's Usage function to be set
e6cbb0d 
Fixes golang#7779.

LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/147210043
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jun 26, 2018
@robpike @wheatman
flag: allow CommandLine's Usage function to be set
6661538 
Fixes golang#7779.

LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/147210043
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 9, 2018
@robpike @wheatman
flag: allow CommandLine's Usage function to be set
ad9827f 
Fixes golang#7779.

LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/147210043
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 30, 2018
@robpike @wheatman
flag: allow CommandLine's Usage function to be set
5a18c05 
Fixes golang#7779.

LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/147210043
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@rsc @ianlancetaylor @robpike @gopherbot