goexec is a command line tool to execute Go code. Output is printed as goons to stdout.
go install github.com/shurcooL/goexec@latestUsage: goexec [flags] [packages] [package.]function(parameters)
echo parameters | goexec -stdin [flags] [packages] [package.]function
-compiler string
Compiler to use, one of: "gc", "gopherjs". (default "gc")
-n Print the generated source but do not run it.
-quiet
Do not dump the return values as a goon.
-stdin
Read func parameters from stdin instead.
-tags string
A comma-separated list of build tags to consider satisfied during the build.
$ goexec 'strings.Repeat("Go! ", 5)'
(string)("Go! Go! Go! Go! Go! ")
$ goexec strings 'Replace("Calling Go functions from the terminal is hard.", "hard", "easy", -1)'
(string)("Calling Go functions from the terminal is easy.")
# Note that parser.ParseExpr returns 2 values (ast.Expr, error).
$ goexec 'parser.ParseExpr("5 + 7")'
(*ast.BinaryExpr)(&ast.BinaryExpr{
X: (*ast.BasicLit)(&ast.BasicLit{
ValuePos: (token.Pos)(1),
Kind: (token.Token)(5),
Value: (string)("5"),
}),
OpPos: (token.Pos)(3),
Op: (token.Token)(12),
Y: (*ast.BasicLit)(&ast.BasicLit{
ValuePos: (token.Pos)(5),
Kind: (token.Token)(5),
Value: (string)("7"),
}),
})
(interface{})(nil)
# Run function RepoRootForImportPath from package "golang.org/x/tools/go/vcs".
$ goexec 'vcs.RepoRootForImportPath("rsc.io/pdf", false)'
(*vcs.RepoRoot)(...)
(interface{})(nil)
$ goexec -quiet 'fmt.Println("Use -quiet to disable output of goon; useful if you want to print to stdout.")'
Use -quiet to disable output of goon; useful if you want to print to stdout.
$ echo '"fmt"' | goexec -stdin 'gist4727543.GetForcedUse'
(string)("var _ = fmt.Errorf")