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Daniel Martí cc02d59e84 cmd/gofmt: always format non-directory arguments again
golang.org/cl/284138 introduced a regression: running "gofmt foo" would
silently ignore the file due to its lack of a ".go" extension, whereas
the tool is documented otherwise:

	Given a file, it operates on that file; given a directory, it
	operates on all .go files in that directory, recursively.

This wasn't caught as there were no tests for these edge cases. gofmt's
own tests are regular Go tests, so it's hard to test it properly without
adding an abstraction layer on top of func main.

Luckily, this kind of test is a great fit for cmd/go's own script tests,
and it just takes a few straightforward lines.

Finally, add the relevant logic back, with documentation to clarify its
intentional purpose.

Fixes #45859.

Change-Id: Ic5bf5937b8f95fcdad2b6933227c8b504ef38a82
Reviewed-on: https://go-review.googlesource.com/c/go/+/315270
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Trust: Daniel Martí <mvdan@mvdan.cc>
Trust: Robert Griesemer <gri@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-04-30 16:17:01 +00:00
.github
api api: update next.txt 2021-04-30 00:32:42 +00:00
doc spec: clarify conditions for switch expression type 2021-04-28 18:50:51 +00:00
lib/time lib/time, time/tzdata: update tzdata to 2021a 2021-01-25 16:08:46 +00:00
misc runtime: rename walltime1 to walltime 2021-04-29 14:15:04 +00:00
src cmd/gofmt: always format non-directory arguments again 2021-04-30 16:17:01 +00:00
test cmd/compile: use desired register only if it satisfies register mask 2021-04-28 16:13:40 +00:00
.gitattributes
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: add new e-mail addresses for Andy Pan 2021-03-12 02:56:04 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
CONTRIBUTORS A+C: add new e-mail addresses for Andy Pan 2021-03-12 02:56:04 +00:00
LICENSE
PATENTS
README.md README: pull gopher image from website 2021-02-16 18:25:10 +00:00
SECURITY.md

The Go Programming Language

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