Add a few flag helper functions

1 files changed, 50 insertions, 0 deletions

diff --git a/flag_test.go b/flag_test.go
new file mode 100644
index 0000000..56711d5
--- /dev/null
+++ b/flag_test.go
@@ -0,0 +1,50 @@
+// SPDX-FileCopyrightText: © 2022 Grégoire Duchêne <gduchene@awhk.org>
+// SPDX-License-Identifier: ISC
+
+package core_test
+
+import (
+	"flag"
+	"strconv"
+	"testing"
+
+	"go.awhk.org/core"
+)
+
+func TestFlagVar(s *testing.T) {
+	t := core.T{T: s}
+
+	fs := flag.NewFlagSet("", flag.ContinueOnError)
+	fl := core.FlagVar(fs, "test", "", strconv.ParseBool)
+	t.AssertErrorIs(nil, fs.Parse([]string{"-test=true"}))
+	t.AssertEqual(true, *fl)
+}
+
+func TestFlagVarPtr(s *testing.T) {
+	t := core.T{T: s}
+
+	fs := flag.NewFlagSet("", flag.ContinueOnError)
+	fl := false
+	core.FlagVarPtr(fs, "test", "", strconv.ParseBool, &fl)
+	t.AssertErrorIs(nil, fs.Parse([]string{"-test=true"}))
+	t.AssertEqual(true, fl)
+}
+
+func TestFlagVarSlice(s *testing.T) {
+	t := core.T{T: s}
+
+	fs := flag.NewFlagSet("", flag.ContinueOnError)
+	fl := core.FlagVarSlice(fs, "test", "", strconv.Atoi)
+	t.AssertErrorIs(nil, fs.Parse([]string{"-test=1", "-test=2", "-test=42"}))
+	t.AssertEqual([]int{1, 2, 42}, *fl)
+}
+
+func TestFlagVarSlicePtr(s *testing.T) {
+	t := core.T{T: s}
+
+	fs := flag.NewFlagSet("", flag.ContinueOnError)
+	fl := []int{}
+	core.FlagVarSlicePtr(fs, "test", "", strconv.Atoi, &fl)
+	t.AssertErrorIs(nil, fs.Parse([]string{"-test=1", "-test=2", "-test=42"}))
+	t.AssertEqual([]int{1, 2, 42}, fl)
+}