fix: restore old runCommand code + dotnet exit code check

respect code 145 for dotnet segment

src/environment.go

@@ -1,12 +1,9 @@
 package main
 
 import (
-	"bufio"
-	"bytes"
 	"context"
 	"errors"
 	"fmt"
-	"io"
 	"io/ioutil"
 	"log"
 	"net/http"
@@ -155,46 +152,17 @@ func (env *environment) getPlatform() string {
 }
 
 func (env *environment) runCommand(command string, args ...string) (string, error) {
-	getOutputString := func(io io.ReadCloser) string {
-		output := new(bytes.Buffer)
-		defer output.Reset()
-		buf := bufio.NewReader(io)
-		multiline := false
-		for {
-			line, _, _ := buf.ReadLine()
-			if line == nil {
-				break
-			}
-			if multiline {
-				output.WriteString("\n")
-			}
-			output.Write(line)
-			multiline = true
-		}
-		return output.String()
-	}
-	cmd := exec.Command(command, args...)
-	stdout, err := cmd.StdoutPipe()
-	if err != nil {
-		log.Fatal(err)
-	}
-	stderr, err := cmd.StderrPipe()
-	if err != nil {
-		log.Fatal(err)
+	out, err := exec.Command(command, args...).Output()
+
+	var exerr *exec.ExitError
+	if errors.As(err, &exerr) {
+		return "", &commandError{exitCode: exerr.ExitCode()}
 	}
-	err = cmd.Start()
 	if err != nil {
 		return "", err
 	}
-	defer func() {
-		_ = cmd.Process.Kill()
-	}()
-	stdoutString := getOutputString(stdout)
-	stderrString := getOutputString(stderr)
-	if stderrString != "" {
-		return "", errors.New(stderrString)
-	}
-	return stdoutString, nil
+
+	return strings.TrimSpace(string(out)), nil
 }
 
 func (env *environment) runShellCommand(shell, command string) string {

src/segment_language.go

@@ -36,7 +36,7 @@ func (l *language) string() string {
 	}
 
 	// call getVersion if displayVersion set in config
-	if l.props.getBool(DisplayVersion, true) && l.hasCommand() && l.getVersion() {
+	if l.props.getBool(DisplayVersion, true) && l.getVersion() {
 		return l.version
 	}
 	return ""