Add ls and pwd command

os/command/ls.go

@@ -0,0 +1,58 @@
+package command
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/mkishere/sshsyrup/os"
+)
+
+type ls struct{}
+
+func init() {
+	os.RegisterCommand("ls", ls{})
+}
+
+func (cmd ls) GetHelp() string {
+	return ""
+}
+
+func (cmd ls) Where() string {
+	return "/bin/ls"
+}
+
+func (cmd ls) Exec(args []string, sys *os.System) int {
+	var path string
+	if len(args) > 0 {
+		path = args[0]
+	} else {
+		path = sys.Getcwd()
+	}
+	dirList, err := sys.FSys.ReadDir(path)
+	if err != nil {
+		fmt.Fprintf(sys.Out(), "ls: cannot access %v: No such file or directory\n", path)
+		return 1
+	}
+	// Sort directory list
+	dirName := make([]string, 0, len(dirList))
+	maxlen := 0
+	for k := range dirList {
+		if len(k) > maxlen {
+			maxlen = len(k)
+		}
+		dirName = append(dirName, k)
+	}
+	sort.Strings(dirName)
+
+	itemPerRow := int(sys.Width / (maxlen + 1))
+
+	for i := 0; i < len(dirName); i++ {
+		fmt.Fprintf(sys.Out(), "%v%v  ", dirName[i], strings.Repeat(" ", maxlen-len(dirName[i])))
+		if (i+1)%itemPerRow == 0 {
+			fmt.Fprint(sys.Out(), "\n")
+		}
+	}
+	fmt.Fprint(sys.Out(), "\n")
+	return 0
+}

os/command/pwd.go

@@ -0,0 +1,26 @@
+package command
+
+import (
+	"fmt"
+
+	"github.com/mkishere/sshsyrup/os"
+)
+
+type pwd struct{}
+
+func init() {
+	os.RegisterCommand("pwd", pwd{})
+}
+
+func (p pwd) GetHelp() string {
+	return ""
+}
+
+func (p pwd) Exec(args []string, sys *os.System) int {
+	fmt.Fprintln(sys.Out(), sys.Getcwd())
+	return 0
+}
+
+func (p pwd) Where() string {
+	return "/bin/pwd"
+}