├── .gitignore ├── LICENSE ├── fixconsole_default.go ├── fixconsole_windows.go ├── go.mod └── go.sum /.gitignore: -------------------------------------------------------------------------------- 1 | *~ 2 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. 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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /fixconsole_default.go: -------------------------------------------------------------------------------- 1 | // +build !windows 2 | 3 | package fixconsole 4 | 5 | // On non-windows platforms, we don't need to do anything. The console 6 | // starts off attached already, if it exists. 7 | 8 | func AttachConsole() error { 9 | return nil 10 | } 11 | 12 | func FixConsoleIfNeeded() error { 13 | return nil 14 | } 15 | -------------------------------------------------------------------------------- /fixconsole_windows.go: -------------------------------------------------------------------------------- 1 | package fixconsole 2 | 3 | import ( 4 | "fmt" 5 | "github.com/apenwarr/w32" 6 | "golang.org/x/sys/windows" 7 | "os" 8 | "syscall" 9 | ) 10 | 11 | func AttachConsole() error { 12 | const ATTACH_PARENT_PROCESS = ^uintptr(0) 13 | proc := syscall.MustLoadDLL("kernel32.dll").MustFindProc("AttachConsole") 14 | r1, _, err := proc.Call(ATTACH_PARENT_PROCESS) 15 | if r1 == 0 { 16 | errno, ok := err.(syscall.Errno) 17 | if ok && errno == w32.ERROR_INVALID_HANDLE { 18 | // console handle doesn't exist; not a real 19 | // error, but the console handle will be 20 | // invalid. 21 | return nil 22 | } 23 | return err 24 | } else { 25 | return nil 26 | } 27 | } 28 | 29 | var oldStdin, oldStdout, oldStderr *os.File 30 | 31 | // Windows console output is a mess. 32 | // 33 | // If you compile as "-H windows", then if you launch your program without 34 | // a console, Windows forcibly creates one to use as your stdin/stdout, which 35 | // is silly for a GUI app, so we can't do that. 36 | // 37 | // If you compile as "-H windowsgui", then it doesn't create a console for 38 | // your app... but also doesn't provide a working stdin/stdout/stderr even if 39 | // you *did* launch from the console. However, you can use AttachConsole() 40 | // to get a handle to your parent process's console, if any, and then 41 | // os.NewFile() to turn that handle into a fd usable as stdout/stderr. 42 | // 43 | // However, then you have the problem that if you redirect stdout or stderr 44 | // from the shell, you end up ignoring the redirection by forcing it to the 45 | // console. 46 | // 47 | // To fix *that*, we have to detect whether there was a pre-existing stdout 48 | // or not. We can check GetStdHandle(), which returns 0 for "should be 49 | // console" and nonzero for "already pointing at a file." 50 | // 51 | // Be careful though! As soon as you run AttachConsole(), it resets *all* 52 | // the GetStdHandle() handles to point them at the console instead, thus 53 | // throwing away the original file redirects. So we have to GetStdHandle() 54 | // *before* AttachConsole(). 55 | // 56 | // For some reason, powershell redirections provide a valid file handle, but 57 | // writing to that handle doesn't write to the file. I haven't found a way 58 | // to work around that. (Windows 10.0.17763.379) 59 | // 60 | // Net result is as follows. 61 | // Before: 62 | // SHELL NON-REDIRECTED REDIRECTED 63 | // explorer.exe no console n/a 64 | // cmd.exe broken works 65 | // powershell broken broken 66 | // WSL bash broken works 67 | // After 68 | // SHELL NON-REDIRECTED REDIRECTED 69 | // explorer.exe no console n/a 70 | // cmd.exe works works 71 | // powershell works broken 72 | // WSL bash works works 73 | // 74 | // We don't seem to make anything worse, at least. 75 | func FixConsoleIfNeeded() error { 76 | // Retain the original console objects, to prevent Go from automatically 77 | // closing their file descriptors when they get garbage collected. 78 | // You never want to close file descriptors 0, 1, and 2. 79 | oldStdin, oldStdout, oldStderr = os.Stdin, os.Stdout, os.Stderr 80 | 81 | stdin, _ := syscall.GetStdHandle(syscall.STD_INPUT_HANDLE) 82 | stdout, _ := syscall.GetStdHandle(syscall.STD_OUTPUT_HANDLE) 83 | stderr, _ := syscall.GetStdHandle(syscall.STD_ERROR_HANDLE) 84 | 85 | var invalid syscall.Handle 86 | con := invalid 87 | 88 | if stdin == invalid || stdout == invalid || stderr == invalid { 89 | err := AttachConsole() 90 | if err != nil { 91 | return fmt.Errorf("attachconsole: %v", err) 92 | } 93 | 94 | if stdin == invalid { 95 | stdin, _ = syscall.GetStdHandle(syscall.STD_INPUT_HANDLE) 96 | } 97 | if stdout == invalid { 98 | stdout, _ = syscall.GetStdHandle(syscall.STD_OUTPUT_HANDLE) 99 | con = stdout 100 | } 101 | if stderr == invalid { 102 | stderr, _ = syscall.GetStdHandle(syscall.STD_ERROR_HANDLE) 103 | con = stderr 104 | } 105 | } 106 | 107 | if con != invalid { 108 | // Make sure the console is configured to convert 109 | // \n to \r\n, like Go programs expect. 110 | h := windows.Handle(con) 111 | var st uint32 112 | err := windows.GetConsoleMode(h, &st) 113 | if err != nil { 114 | return fmt.Errorf("GetConsoleMode: %v", err) 115 | } 116 | err = windows.SetConsoleMode(h, st&^windows.DISABLE_NEWLINE_AUTO_RETURN) 117 | if err != nil { 118 | return fmt.Errorf("SetConsoleMode: %v", err) 119 | } 120 | } 121 | 122 | if stdin != invalid { 123 | os.Stdin = os.NewFile(uintptr(stdin), "stdin") 124 | } 125 | if stdout != invalid { 126 | os.Stdout = os.NewFile(uintptr(stdout), "stdout") 127 | } 128 | if stderr != invalid { 129 | os.Stderr = os.NewFile(uintptr(stderr), "stderr") 130 | } 131 | return nil 132 | } 133 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/apenwarr/fixconsole 2 | 3 | go 1.12 4 | 5 | require ( 6 | github.com/apenwarr/w32 v0.0.0-20190407065021-aa00fece76ab 7 | golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67 8 | ) 9 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/apenwarr/w32 v0.0.0-20190407065021-aa00fece76ab h1:CMGzRRCjnD50RjUFSArBLuCxiDvdp7b8YPAcikBEQ+k= 2 | github.com/apenwarr/w32 v0.0.0-20190407065021-aa00fece76ab/go.mod h1:nfFtvHn2Hgs9G1u0/J6LHQv//EksNC+7G8vXmd1VTJ8= 3 | golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67 h1:1Fzlr8kkDLQwqMP8GxrhptBLqZG/EDpiATneiZHY998= 4 | golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 5 | --------------------------------------------------------------------------------