go - 如何使用 gofmt 将单引号替换为双引号

Question

我使用 go 1.6，我喜欢使用单引号。完成文件编辑后，我想在我的终端中使用 gofmt 替换它们，但没有任何效果。

    gofmt -r "'->\"" book.go
    parsing pattern ' at 1:1: rune literal not terminated

我使用 zsh。

Answer 1

$ go doc cmd/gofmt

Gofmt formats Go programs.

The flags are:

-r rule
  Apply the rewrite rule to the source before reformatting.

The rewrite rule specified with the -r flag must be a string of the form:

pattern -> replacement

Both pattern and replacement must be valid Go expressions. In the pattern, single-character lowercase identifiers serve as wildcards matching arbitrary sub-expressions; those expressions will be substituted for the same identifiers in the replacement.

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The Go Programming Language Specification

Expressions

An expression specifies the computation of a value by applying operators and functions to operands.

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模式和替换都必须是有效的 Go 表达式。