I've got a command line tool written in Golang and I need to start vim from it. However it's not working, and there's not any error or much else to work with. I've reduced the code to just this:
package main
import (
"fmt"
"os/exec"
)
func main() {
cmd := exec.Command("vim", "test.txt")
err := cmd.Run()
fmt.Println(err)
}
When I run this, I can see the vim process for a 2-3 seconds but the application doesn't actually open. Then the program simply exits (and the vim process closes) with an "exit status 1".
I've also tried this to capture stderr:
package main
import (
"bytes"
"fmt"
"os/exec"
)
func main() {
cmd := exec.Command("vim", "test.txt")
var stderr bytes.Buffer
cmd.Stderr = &stderr
err := cmd.Run()
fmt.Println(err)
fmt.Println(stderr)
}
But in this case, the program gets stuck indefinitely.
Any idea what could be the issue?
Pass on stdin
and stdout
from the calling program which, provided it was run from a terminal (likely for a command line program) will start vim for you and return control when the user has finished editing the file.
package main
import (
"fmt"
"os"
"os/exec"
)
func main() {
cmd := exec.Command("vim", "test.txt")
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
err := cmd.Run()
fmt.Println(err)
}
VIM needs a proper terminal and detects the absence of one.
If you use the StderrPipe
and read it while vim is running you will see this:
2014/02/02 20:25:49 Vim: Warning: Output is not to a terminal
2014/02/02 20:25:49 Vim: Warning: Input is not from a terminal
Example for reading stderr while executing (on play):
func logger(pipe io.ReadCloser) {
reader := bufio.NewReader(pipe)
for {
output, err := reader.ReadString('\n')
if err != nil {
log.Println(err)
return
}
log.Print(string(output))
}
}
pipe, err := cmd.StderrPipe()
go logger(pipe)
cmd.Run()
For vim to run you probably need to emulate a terminal.
Maybe goat (doc) can help you out:
tty := term.NewTTY(os.Stdin)
cmd := exec.Command("vim", "test.txt")
cmd.Stdin = t
cmd.Stdout = t
// ...
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