feat: temlated shell command

eval.go

@@ -368,6 +368,12 @@ func (e *setExpr) eval(app *app, args []string) {
 			return
 		}
 		gOpts.shellopts = strings.Split(e.val, ":")
+	case "shellcmd":
+		if e.val == "" {
+			gOpts.shellcmd = nil
+			return
+		}
+		gOpts.shellcmd = tokenize(e.val)
 	case "sortby":
 		method := sortMethod(e.val)
 		if !isValidSortMethod(method) {

misc.go

@@ -108,8 +108,31 @@ func unescape(s string) string {
 }
 
 // This function splits the given string by whitespaces. It is aware of escaped
-// whitespaces so that they are not split unintentionally.
+// whitespaces and quoted strings so that they are not split unintentionally.
 func tokenize(s string) []string {
+	quoted := false
+	esc := false
+	toks := strings.FieldsFunc(s, func(r rune) bool {
+		if r == '\'' || r == '"' || r == '`' {
+			quoted = !quoted
+		}
+		if esc {
+			esc = false
+			return false
+		}
+		if r == '\\' {
+			esc = true
+			return false
+		}
+		return !quoted && unicode.IsSpace(r)
+	})
+	if len(toks) == 0 {
+		toks = append(toks, s)
+	}
+	return toks
+}
+
+func tokenize_old(s string) []string {
 	esc := false
 	var buf []rune
 	var toks []string

misc_test.go

@@ -188,11 +188,12 @@ func TestTokenize(t *testing.T) {
 
 	for _, test := range tests {
 		if got := tokenize(test.s); !reflect.DeepEqual(got, test.exp) {
-			t.Errorf("at input '%v' expected '%v' but got '%v'", test.s, test.exp, got)
+			t.Errorf("at input '%#v' expected '%#v' but got '%#v'", test.s, test.exp, got)
 		}
 	}
 }
 
+
 func TestSplitWord(t *testing.T) {
 	tests := []struct {
 		s    string

opts.go

@@ -94,6 +94,7 @@ var gOpts struct {
 	rulerfmt         string
 	preserve         []string
 	shellopts        []string
+	shellcmd         []string
 	keys             map[string]expr
 	cmdkeys          map[string]expr
 	cmds             map[string]expr
@@ -240,6 +241,7 @@ func init() {
 	gOpts.rulerfmt = "  %a|  %p|  \033[7;31m %m \033[0m|  \033[7;33m %c \033[0m|  \033[7;35m %s \033[0m|  \033[7;34m %f \033[0m|  %i/%t"
 	gOpts.preserve = []string{"mode"}
 	gOpts.shellopts = nil
+	gOpts.shellcmd = nil
 	gOpts.tempmarks = "'"
 	gOpts.numberfmt = "\033[33m"
 	gOpts.tagfmt = "\033[31m"

os.go

@@ -135,16 +135,40 @@ func detachedCommand(name string, arg ...string) *exec.Cmd {
 	return cmd
 }
 
+func shellCommand2(s string, args []string) *exec.Cmd {
+	var words []string
+	for _, word := range gOpts.shellcmd {
+		switch word {
+		case "%a":
+			words = append(words, args...)
+		case "%c":
+			words = append(words, s)
+		default:
+			words = append(words, word)
+		}
+	}
+	cmd := exec.Command(words[0], words[1:]...)
+	return cmd
+}
+
 func shellCommand(s string, args []string) *exec.Cmd {
+
 	if len(gOpts.ifs) != 0 {
 		s = fmt.Sprintf("IFS='%s'; %s", gOpts.ifs, s)
 	}
 
+	if len(gOpts.shellcmd) > 0 {
+		return shellCommand2(s, args)
+	}
+
+	// original legacy configuration which uses shell, shellopts and shellflag
+
 	args = append([]string{gOpts.shellflag, s, "--"}, args...)
 
 	args = append(gOpts.shellopts, args...)
 
-	return exec.Command(gOpts.shell, args...)
+	cmd := exec.Command(gOpts.shell, args...)
+	return cmd
 }
 
 func shellSetPG(cmd *exec.Cmd) {