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cmd/gofmt: gofmt is inconsistent #24609

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cg31 opened this issue Mar 30, 2018 · 2 comments
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cmd/gofmt: gofmt is inconsistent #24609

cg31 opened this issue Mar 30, 2018 · 2 comments
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@cg31
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cg31 commented Mar 30, 2018 •
edited by ALTree

In following code, both functions have argument str, and both functions are called with "test"+str1, go-fmt should have same behavior handling them.

But the first case, there will be spaces inserted around +, in second case, the spaces will be removed around +.

package main

import "fmt"

func test1(str string) {
	fmt.Println(str)
}

func test2(str string, str2 string) {
	fmt.Println(str)
	fmt.Println(str2)
}
func main() {
	str1 := "1"
	str2 := "2"
	test1("test"+str1) // spaces will be inserted around '+'
	test2("test" + str1, str2) // spaces will be removed around '+'
}
@ysmolski
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ysmolski commented Mar 30, 2018 •
edited

It's not a bug, but a feature: https://golang.org/doc/effective_go.html#formatting

Parentheses
Go needs fewer parentheses than C and Java: control structures (if, for, switch) do not have parentheses in their syntax. Also, the operator precedence hierarchy is shorter and clearer, so
x<<8 + y<<16
means what the spacing implies, unlike in the other languages.

Check this out: https://play.golang.org/p/JiiUb_kjcXC - it's already properly formatted.

@FiloSottile FiloSottile changed the title go-fmt is inconsistent cmd/gofmt: gofmt is inconsistent Mar 30, 2018
@FiloSottile
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This is indeed intended behavior. Just like (5 * 2) has spaces around the *, but adding a + removes them ((5*2 + 2)) to provide visual grouping. Here the , has precedence, so the spaces are removed to provide visual grouping in the arguments.

It gets more useful in cases like ("test"+str1, "test"+str2), where you can clearly see there are two arguments.

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@ysmolski @cg31 @FiloSottile @gopherbot