feat(bonfire): add FlagBool and read every bare switch with it (IN-04, quick-261028-rqd)

modules/bonfire/command_test.go

@@ -115,3 +115,40 @@ func TestHelpShowsLongOrDescription(t *testing.T) {
 		})
 	}
 }
+
+// TestFlagBool (IN-04): FlagBool reads a bare switch with
+// strconv.ParseBool; unset, empty or unparsable values are false, and a
+// nil Input has no flags.
+func TestFlagBool(t *testing.T) {
+	cases := []struct {
+		args []string
+		want bool
+	}{
+		{nil, false},
+		{[]string{"--x"}, true},
+		{[]string{"--x=1"}, true},
+		{[]string{"--x=t"}, true},
+		{[]string{"--x=TRUE"}, true},
+		{[]string{"--x=True"}, true},
+		{[]string{"--x=false"}, false},
+		{[]string{"--x=0"}, false},
+		{[]string{"--x="}, false},
+		{[]string{"--x=yes"}, false},
+	}
+	for _, tc := range cases {
+		var got bool
+		cmd := Command{Name: "acme:switch", Flags: []Flag{{Name: "x", Bare: true}}, Run: func(_ context.Context, in Input, _ Output) error {
+			got = FlagBool(in, "x")
+			return nil
+		}}
+		if err := Call(context.Background(), []Command{cmd}, "acme:switch", tc.args, nil); err != nil {
+			t.Fatalf("%q: %v", tc.args, err)
+		}
+		if got != tc.want {
+			t.Errorf("FlagBool with %q = %v, want %v", tc.args, got, tc.want)
+		}
+	}
+	if FlagBool(nil, "x") {
+		t.Error("FlagBool(nil) = true")
+	}
+}