The Great Rewrite (fixes #36, #61, #94, #101)

Rewrite of the file model and pulling mechanism. Needs lots of cleanup
and bugfixes, now...

cmd/stcli/logger.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+)
+
+var logger *log.Logger
+
+func init() {
+	log.SetOutput(os.Stderr)
+	logger = log.New(os.Stderr, "", log.Flags())
+}
+
+func debugln(vals ...interface{}) {
+	s := fmt.Sprintln(vals...)
+	logger.Output(2, "DEBUG: "+s)
+}
+
+func debugf(format string, vals ...interface{}) {
+	s := fmt.Sprintf(format, vals...)
+	logger.Output(2, "DEBUG: "+s)
+}
+
+func infoln(vals ...interface{}) {
+	s := fmt.Sprintln(vals...)
+	logger.Output(2, "INFO: "+s)
+}
+
+func infof(format string, vals ...interface{}) {
+	s := fmt.Sprintf(format, vals...)
+	logger.Output(2, "INFO: "+s)
+}
+
+func okln(vals ...interface{}) {
+	s := fmt.Sprintln(vals...)
+	logger.Output(2, "OK: "+s)
+}
+
+func okf(format string, vals ...interface{}) {
+	s := fmt.Sprintf(format, vals...)
+	logger.Output(2, "OK: "+s)
+}
+
+func warnln(vals ...interface{}) {
+	s := fmt.Sprintln(vals...)
+	logger.Output(2, "WARNING: "+s)
+}
+
+func warnf(format string, vals ...interface{}) {
+	s := fmt.Sprintf(format, vals...)
+	logger.Output(2, "WARNING: "+s)
+}
+
+func fatalln(vals ...interface{}) {
+	s := fmt.Sprintln(vals...)
+	logger.Output(2, "FATAL: "+s)
+	os.Exit(3)
+}
+
+func fatalf(format string, vals ...interface{}) {
+	s := fmt.Sprintf(format, vals...)
+	logger.Output(2, "FATAL: "+s)
+	os.Exit(3)
+}
+
+func fatalErr(err error) {
+	if err != nil {
+		fatalf(err.Error())
+	}
+}