From af9b3d79b6086e7f8c8ed5bc74753a806d5cddfa Mon Sep 17 00:00:00 2001
From: Kevin Chabowski <kevin@kch42.de>
Date: Sat, 29 Jun 2013 12:25:46 +0200
Subject: Initial commit.

---
 simpleconf.go | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 simpleconf.go

diff --git a/simpleconf.go b/simpleconf.go
new file mode 100644
index 0000000..777cd53
--- /dev/null
+++ b/simpleconf.go
@@ -0,0 +1,168 @@
+package simpleconf
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Config map[string]Section
+type Section map[string]string
+
+func (c Config) addSection(section Section, name string) {
+	if section != nil {
+		c[name] = section
+	}
+}
+
+func Load(r io.Reader) (config Config, outerr error) {
+	config = make(Config)
+	scanner := bufio.NewScanner(r)
+
+	var section Section
+	var sectName string
+
+	for l := 1; scanner.Scan(); l++ {
+		line := strings.TrimSpace(scanner.Text())
+		if len(line) == 0 {
+			continue
+		}
+
+		switch line[0] {
+		case ';', '#':
+			continue
+		case '[':
+			parts := strings.SplitN(line, "[", 2)
+			parts = strings.SplitN(parts[1], "]", 2)
+
+			if len(parts) != 2 {
+				return nil, fmt.Errorf("Missing closing ']' in section header at line %d", l)
+			}
+			if len(parts[1]) != 0 {
+				return nil, fmt.Errorf("More data after closing ']' at line %d", l)
+			}
+
+			config.addSection(section, sectName)
+			section = make(Section)
+		default:
+			parts := strings.SplitN(line, "=", 2)
+			if len(parts) != 2 {
+				return nil, fmt.Errorf("Couldn't neither find a comment, a section header nor a key-value pair at line %d", l)
+			}
+
+			key := strings.TrimSpace(parts[0])
+			val := strings.TrimSpace(parts[1])
+			if len(key) == 0 {
+				return nil, fmt.Errorf("Empty key at line %d", l)
+			}
+
+			if section == nil {
+				return nil, fmt.Errorf("Found key-value pair, but no section at line %d", l)
+			}
+
+			section[key] = val
+		}
+	}
+
+	config.addSection(section, sectName)
+
+	outerr = scanner.Err()
+	return
+}
+
+var (
+	NotFound = errors.New("Section or key not found.")
+	NotBool  = errors.New("Could not interpret value as bool.")
+)
+
+func (c Config) GetString(section, key string) (string, error) {
+	s, ok := c[section]
+	if !ok {
+		return "", NotFound
+	}
+	rv, ok := s[key]
+	if !ok {
+		return "", NotFound
+	}
+	return rv, nil
+}
+
+func (c Config) GetStringDefault(d, section, key string) (string, error) {
+	rv, err := c.GetString(section, key)
+	if err == NotFound {
+		return d, nil
+	}
+	return rv, err
+}
+
+func (c Config) GetInt(section, key string) (int64, error) {
+	s, err := c.GetString(section, key)
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseInt(s, 10, 64)
+}
+
+func (c Config) GetIntDefault(d int64, section, key string) (int64, error) {
+	rv, err := c.GetInt(section, key)
+	if err == NotFound {
+		return d, nil
+	}
+	return rv, err
+}
+
+func (c Config) GetFloat(section, key string) (float64, error) {
+	s, err := c.GetString(section, key)
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseFloat(s, 64)
+}
+
+func (c Config) GetFloatDefault(d float64, section, key string) (float64, error) {
+	rv, err := c.GetFloat(section, key)
+	if err == NotFound {
+		return d, nil
+	}
+	return rv, err
+}
+
+func (c Config) GetBool(section, key string) (bool, error) {
+	s, err := c.GetString(section, key)
+	if err != nil {
+		return false, err
+	}
+	switch strings.ToLower(s) {
+	case "true", "on", "yes", "y", "1":
+		return true, nil
+	case "false", "off", "no", "n", "0":
+		return false, nil
+	default:
+		return false, NotBool
+	}
+}
+
+func (c Config) GetBoolDefault(d bool, section, key string) (bool, error) {
+	rv, err := c.GetBool(section, key)
+	if err == NotFound {
+		return d, nil
+	}
+	return rv, err
+}
+
+func (c Config) GetFile(flag int, perm os.FileMode, section, key string) (*os.File, error) {
+	s, err := c.GetString(section, key)
+	if err != nil {
+		return nil, err
+	}
+
+	return os.OpenFile(s, flag, perm)
+}
+
+func (c Config) GetFileReadonly(section, key string) (*os.File, error) {
+	return c.GetFile(os.O_RDONLY, 0, section, key)
+}
-- 
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