add author key mapping

1 files changed, 33 insertions, 3 deletions

diff --git a/skate/xio/util.go b/skate/xio/util.go
index 554317b..c0439e5 100644
--- a/skate/xio/util.go
+++ b/skate/xio/util.go
@@ -1,9 +1,14 @@
 package xio
 
-import "os"
+import (
+	"bufio"
+	"io"
+	"os"
+	"strings"
+)
 
-// OpenTwo opens two files, and the caller needs to check for a single error only.
-func OpenTwo(f1, f2 string) (g1 *os.File, g2 *os.File, err error) {
+// OpenTwo opens two files. The caller needs to check for a single error only.
+func OpenTwo(f1, f2 string) (g1, g2 *os.File, err error) {
 	if g1, err = os.Open(f1); err != nil {
 		return nil, nil, err
 	}
@@ -12,3 +17,28 @@ func OpenTwo(f1, f2 string) (g1 *os.File, g2 *os.File, err error) {
 	}
 	return g1, g2, nil
 }
+
+// TabsToMap read from a reader and turns values from kCol, vCol columns into a
+// mapping.
+func TabsToMap(r io.Reader, sep string, kCol, vCol int) (map[string]string, error) {
+	var (
+		br = bufio.NewReader(r)
+		m  = make(map[string]string)
+	)
+	for {
+		line, err := br.ReadString('\n')
+		if err == io.EOF {
+			return m, nil
+		}
+		if err != nil {
+			return nil, err
+		}
+		fields := strings.Split(line, sep)
+		if len(fields) <= kCol && len(fields) <= vCol {
+			k := strings.TrimSpace(fields[kCol-1])
+			v := strings.TrimSpace(fields[vCol-1])
+			m[k] = v
+		}
+	}
+	return m, nil
+}