From eda8e846fe17627497222007f5dcdcb2dad53fb3 Mon Sep 17 00:00:00 2001
From: rsteube <rsteube@users.noreply.github.com>
Date: Thu, 10 Dec 2020 18:33:07 +0100
Subject: [PATCH] removed go-ps dependency

---
 carapace.go | 61 ++++++++++++++++++++++++++++++++---------------------
 go.mod      |  1 -
 go.sum      |  2 --
 3 files changed, 37 insertions(+), 27 deletions(-)

diff --git a/carapace.go b/carapace.go
index 89eabe0dc..a3dc56939 100644
--- a/carapace.go
+++ b/carapace.go
@@ -8,9 +8,10 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
+	"os/exec"
+	"runtime"
 	"strings"
 
-	ps "github.com/mitchellh/go-ps"
 	"github.com/rsteube/carapace/internal/bash"
 	"github.com/rsteube/carapace/internal/elvish"
 	"github.com/rsteube/carapace/internal/fish"
@@ -211,31 +212,43 @@ func traverse(cmd *cobra.Command, args []string) (*cobra.Command, []string) {
 }
 
 func determineShell() string {
-	process, err := ps.FindProcess(os.Getpid())
-	for {
-		if process, err = ps.FindProcess(process.PPid()); err != nil || process == nil {
-			return ""
+	for _, executable := range processExecutables() {
+		switch executable {
+		case "bash":
+			return "bash"
+		case "elvish":
+			return "elvish"
+		case "fish":
+			return "fish"
+		case "osh":
+			return "oil"
+		case "powershell.exe":
+			return "powershell"
+		case "pwsh":
+			return "powershell"
+		case "pwsh.exe":
+			return "powershell"
+		case "xonsh":
+			return "xonsh"
+		case "zsh":
+			return "zsh"
+		}
+	}
+	return ""
+}
+
+func processExecutables() []string {
+	if runtime.GOOS == "windows" {
+		return []string{"powershell.exe"} // TODO hardcoded for now, but there might be elvish or sth. else on window
+	} else {
+		if output, err := exec.Command("ps", "-o", "comm").Output(); err != nil {
+			return []string{}
 		} else {
-			switch process.Executable() {
-			case "bash":
-				return "bash"
-			case "elvish":
-				return "elvish"
-			case "fish":
-				return "fish"
-			case "osh":
-				return "oil"
-			case "powershell.exe":
-				return "powershell"
-			case "pwsh":
-				return "powershell"
-			case "pwsh.exe":
-				return "powershell"
-			case "xonsh":
-				return "xonsh"
-			case "zsh":
-				return "zsh"
+			lines := strings.Split(string(output), "\n")[1:]      // skip header
+			for i, j := 0, len(lines)-1; i < j; i, j = i+1, j-1 { // reverse slice
+				lines[i], lines[j] = lines[j], lines[i]
 			}
+			return lines
 		}
 	}
 }
diff --git a/go.mod b/go.mod
index 054165e0a..d9d523174 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,6 @@ module github.com/rsteube/carapace
 go 1.12
 
 require (
-	github.com/mitchellh/go-ps v1.0.0
 	github.com/spf13/cobra v0.0.7
 	github.com/spf13/pflag v1.0.5
 )
diff --git a/go.sum b/go.sum
index 00b5d2cd3..e176a19c8 100644
--- a/go.sum
+++ b/go.sum
@@ -55,8 +55,6 @@ github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czP
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
-github.com/mitchellh/go-ps v1.0.0 h1:i6ampVEEF4wQFF+bkYfwYgY+F/uYJDktmvLPf7qIgjc=
-github.com/mitchellh/go-ps v1.0.0/go.mod h1:J4lOc8z8yJs6vUwklHw2XEIiT4z4C40KtWVN3nvg8Pg=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=