From 8a2461aa05895cc7828bc9619b50fa5dee5ed1f4 Mon Sep 17 00:00:00 2001
From: "Gabriel A. Giovanini" <mail@gabrielgio.me>
Date: Sat, 4 May 2024 23:16:38 +0200
Subject: feat: Add config parsing

---
 pkg/config/config.go      | 84 +++++++++++++++++++++++++++++++++++++++++++++++
 pkg/config/config_test.go | 56 +++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+)
 create mode 100644 pkg/config/config.go
 create mode 100644 pkg/config/config_test.go

(limited to 'pkg/config')

diff --git a/pkg/config/config.go b/pkg/config/config.go
new file mode 100644
index 0000000..ba1614f
--- /dev/null
+++ b/pkg/config/config.go
@@ -0,0 +1,84 @@
+package config
+
+import (
+	"fmt"
+	"io"
+	"strconv"
+
+	"git.sr.ht/~emersion/go-scfg"
+)
+
+type (
+	Scan struct {
+		Path   string
+		Public bool
+	}
+
+	Configuration struct {
+		Scan *Scan
+	}
+)
+
+func Parse(r io.Reader) (*Configuration, error) {
+	block, err := scfg.Read(r)
+	if err != nil {
+		return nil, err
+	}
+
+	config := defaultConfiguration()
+
+	err = setScan(block, config.Scan)
+	if err != nil {
+		return nil, err
+	}
+
+	return config, nil
+}
+
+func defaultConfiguration() *Configuration {
+	return &Configuration{
+		Scan: &Scan{
+			Public: true,
+			Path:   "",
+		},
+	}
+}
+
+func setScan(block scfg.Block, scan *Scan) error {
+	scanDir := block.Get("scan")
+	err := setString(scanDir, &scan.Path)
+	if err != nil {
+		return err
+	}
+
+	public := scanDir.Children.Get("public")
+	return setBool(public, &scan.Public)
+}
+
+func setBool(dir *scfg.Directive, field *bool) error {
+
+	if dir != nil {
+		p1 := first(dir.Params)
+		v, err := strconv.ParseBool(p1)
+		if err != nil {
+			return fmt.Errorf("Error parsing bool param of %s: %w", dir.Name, err)
+		}
+		*field = v
+	}
+	return nil
+}
+
+func setString(dir *scfg.Directive, field *string) error {
+	if dir != nil {
+		*field = first(dir.Params)
+	}
+	return nil
+}
+
+func first[T any](v []T) T {
+	if len(v) == 0 {
+		var zero T
+		return zero
+	}
+	return v[0]
+}
diff --git a/pkg/config/config_test.go b/pkg/config/config_test.go
new file mode 100644
index 0000000..c8cd887
--- /dev/null
+++ b/pkg/config/config_test.go
@@ -0,0 +1,56 @@
+// go:build unit
+package config
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestConfig(t *testing.T) {
+	testCases := []struct {
+		name           string
+		config         string
+		expectedConfig *Configuration
+	}{
+		{
+			name:   "minimal scan",
+			config: `scan "/srv/git"`,
+			expectedConfig: &Configuration{
+				Scan: &Scan{
+					Public: true,
+					Path:   "/srv/git",
+				},
+			},
+		},
+		{
+			name: "complete scan",
+			config: `scan "/srv/git" {
+	public false
+}`,
+			expectedConfig: &Configuration{
+				Scan: &Scan{
+					Public: false,
+					Path:   "/srv/git",
+				},
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			r := strings.NewReader(tc.config)
+			config, err := Parse(r)
+			if err != nil {
+				t.Fatalf("Error parsing config %s", err.Error())
+			}
+
+			if diff := cmp.Diff(tc.expectedConfig, config); diff != "" {
+				t.Errorf("Wrong result given - wanted + got\n %s", diff)
+			}
+
+		})
+
+	}
+}
-- 
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