initial

parser.go

@@ -0,0 +1,72 @@
+package conf
+
+import (
+	"bufio"
+	"io"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+var (
+	configKeyValueRe = regexp.MustCompile(`(\w+) *= *(.+)\b[\t| |\n]*`)
+	configOptionRe   = regexp.MustCompile(`(\w+)`)
+)
+
+type Config struct {
+	Values map[string]string
+}
+
+func (c *Config) Get(key string) (s string) {
+	if val, ok := c.Values[key]; ok {
+		s = val
+	}
+	return
+}
+
+func (c *Config) GetBool(key string) (b bool) {
+	_, b = c.Values[key]
+	return
+}
+
+func (c *Config) GetInt(key string) (n int) {
+	if val, ok := c.Values[key]; ok {
+		num, err := strconv.Atoi(val)
+		if err == nil {
+			n = num
+		}
+	}
+	return
+}
+
+func Parse(filename string) (*Config, error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	c := parseReader(file)
+	return c, nil
+}
+
+func parseReader(r io.Reader) *Config {
+	var c Config
+	c.Values = make(map[string]string)
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.HasPrefix(line, "#") {
+			continue
+		}
+		switch {
+		case configKeyValueRe.MatchString(line):
+			kvpair := configKeyValueRe.FindStringSubmatch(line)
+			c.Values[kvpair[1]] = kvpair[2]
+		case configOptionRe.MatchString(line):
+			opt := configOptionRe.FindString(line)
+			c.Values[opt] = ""
+		}
+	}
+	return &c
+}