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feat(example): implement a faketty example
This implements a faketty executable that can be used to run a command in a fake terminal. This is useful to force escape sequences to be printed to the terminal while piping the output to another command like `sequin`. It also takes the `rows` and `cols` flags to set the terminal size and uses 80x24 as the default.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "flag" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "os/exec" | ||
| "syscall" | ||
|
|
||
| "github.com/creack/pty" | ||
| ) | ||
|
|
||
| var ( | ||
| rows int | ||
| cols int | ||
| ) | ||
|
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| func init() { | ||
| flag.IntVar(&rows, "rows", 24, "number of rows") | ||
| flag.IntVar(&cols, "cols", 80, "number of columns") | ||
| flag.Parse() | ||
| } | ||
|
|
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| func main() { | ||
| if len(os.Args) < 2 { | ||
| fmt.Fprintf(os.Stderr, "usage: %s [command] [args...]\n", os.Args[0]) | ||
| fmt.Fprintf(os.Stderr, " %s -cols=80 -rows=24 [command] [args...]\n", os.Args[0]) | ||
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| os.Exit(1) | ||
| } | ||
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| newStdin := os.Stdin | ||
| newStderr := os.Stderr | ||
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| winsize := pty.Winsize{ | ||
| Rows: uint16(rows), //nolint:gosec | ||
| Cols: uint16(cols), //nolint:gosec | ||
| } | ||
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| ptm1, pts1, err := pty.Open() | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "error creating pty: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| if err := pty.Setsize(ptm1, &winsize); err != nil { | ||
| fmt.Fprintf(os.Stderr, "error setting pty size: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| go io.Copy(os.Stdout, ptm1) //nolint:errcheck | ||
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| newStdout := os.Stdout | ||
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| ptm2, pts2, err := pty.Open() | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "error creating pty: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| if err := pty.Setsize(ptm2, &winsize); err != nil { | ||
| fmt.Fprintf(os.Stderr, "error setting pty size: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| go io.Copy(newStderr, ptm2) //nolint:errcheck | ||
|
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| if err := syscall.Dup2(int(newStdin.Fd()), int(os.Stdin.Fd())); err != nil { | ||
| fmt.Fprintf(os.Stderr, "error duplicating stdin file descriptor: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| if err := syscall.Dup2(int(newStdout.Fd()), int(os.Stdout.Fd())); err != nil { | ||
| fmt.Fprintf(os.Stderr, "error duplicating stdout file descriptor: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| n := flag.NFlag() | ||
| c := exec.Command(os.Args[n+1], os.Args[n+2:]...) //nolint:gosec | ||
| c.Stdout = pts1 | ||
| c.Stderr = pts2 | ||
| c.Stdin = newStdin | ||
|
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||
| if err := c.Run(); err != nil { | ||
| fmt.Fprintf(os.Stderr, "error running command: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| } |
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