Have cmdrunner use a tty

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/briandowns/openweathermap v0.0.0-20180804155945-5f41b7c9d92d
 	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
 	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e
+	github.com/creack/pty v1.1.11
 	github.com/digitalocean/godo v1.44.0
 	github.com/docker/distribution v2.7.1+incompatible // indirect
 	github.com/docker/docker v1.13.1

go.sum

@@ -162,6 +162,8 @@ github.com/creack/pty v1.1.7 h1:6pwm8kMQKCmgUg0ZHTm5+/YvRK0s3THD/28+T6/kk4A=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/creack/pty v1.1.9 h1:uDmaGzcdjhF4i/plgjmEsriH11Y0o7RKapEf/LDaM3w=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/creack/pty v1.1.11 h1:07n33Z8lZxZ2qwegKbObQohDhXDQxiMMz1NOUGYlesw=
+github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/dancannon/gorethink v4.0.0+incompatible h1:KFV7Gha3AuqT+gr0B/eKvGhbjmUv0qGF43aKCIKVE9A=
 github.com/dancannon/gorethink v4.0.0+incompatible/go.mod h1:BLvkat9KmZc1efyYwhz3WnybhRZtgF1K929FD8z1avU=
 github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 h1:y5HC9v93H5EPKqaS1UYVg1uYah5Xf51mBfIoWehClUQ=
@@ -923,6 +925,8 @@ golang.org/x/sys v0.0.0-20200515095857-1151b9dac4a9/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200523222454-059865788121/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200803210538-64077c9b5642 h1:B6caxRw+hozq68X2MY7jEpZh/cr4/aHLv9xU8Kkadrw=
 golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200817155316-9781c653f443 h1:X18bCaipMcoJGm27Nv7zr4XYPKGUy92GtqboKC2Hxaw=
+golang.org/x/sys v0.0.0-20200817155316-9781c653f443/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

modules/cmdrunner/settings.go

@@ -18,6 +18,7 @@ type Settings struct {
 	args     []string `help:"The arguments to the command, with each item as an element in an array. Example: for curl -I cisco.com, the arguments array would be ['-I', 'cisco.com']."`
 	cmd      string   `help:"The terminal command to be run, withouth the arguments. Ie: ping, whoami, curl."`
 	tail     bool     `help:"Automatically scroll to the end of the command output."`
+	pty      bool     `help:"Run the command in a pseudo-terminal. Some apps will behave differently if they feel in a terminal. For example, some apps will produce colorized output in a terminal, and non-colorized output otherwise. Default false" optional:"true"`
 	maxLines int      `help:"Maximum number of lines kept in the buffer."`
 
 	// The dimensions of the module
@@ -32,6 +33,7 @@ func NewSettingsFromYAML(name string, moduleConfig *config.Config, globalConfig
 
 		args:     utils.ToStrs(moduleConfig.UList("args")),
 		cmd:      moduleConfig.UString("cmd"),
+		pty:      moduleConfig.UBool("pty", false),
 		tail:     moduleConfig.UBool("tail", false),
 		maxLines: moduleConfig.UInt("maxLines", 256),
 	}

modules/cmdrunner/widget.go

@@ -3,11 +3,13 @@ package cmdrunner
 import (
 	"bytes"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"strings"
 	"sync"
 
+	"github.com/creack/pty"
 	"github.com/rivo/tview"
 	"github.com/wtfutil/wtf/view"
 )
@@ -121,23 +123,45 @@ func runCommandLoop(widget *Widget) {
 		<-widget.runChan
 		widget.resetBuffer()
 		cmd := exec.Command(widget.settings.cmd, widget.settings.args...)
-		cmd.Stdout = widget
 		cmd.Env = widget.environment()
-		err := cmd.Run()
-
-		// The command has exited, print any error messages
+		var err error
+		if widget.settings.pty {
+			err = runCommandPty(widget, cmd)
+		} else {
+			err = runCommand(widget, cmd)
+		}
 		if err != nil {
-			widget.m.Lock()
-			_, writeErr := widget.buffer.WriteString(err.Error())
-			if writeErr != nil {
-				return
-			}
-			widget.m.Unlock()
+			widget.handleError(err)
 		}
 		widget.redrawChan <- true
 	}
 }
 
+func runCommand(widget *Widget, cmd *exec.Cmd) error {
+	cmd.Stdout = widget
+	return cmd.Run()
+}
+
+func runCommandPty(widget *Widget, cmd *exec.Cmd) error {
+	f, err := pty.Start(cmd)
+	// The command has exited, print any error messages
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(widget.buffer, f)
+	return err
+}
+
+func (widget *Widget) handleError(err error) {
+	widget.m.Lock()
+	defer widget.m.Unlock()
+	_, writeErr := widget.buffer.WriteString(err.Error())
+	if writeErr != nil {
+		return
+	}
+}
+
 func redrawLoop(widget *Widget) {
 	for {
 		widget.Redraw(widget.content)