added docs and comments

README.md

@@ -1,3 +1,6 @@
 # kvrepl
 
-A simple command line REPL (read-eval-print loop) that drives a simple in-memory key/value storage system. This system should also allow for nested transactions. A transaction can then be committed or aborted.
+[![GoDoc](https://godoc.org/s.mcquay.me/dm/kvrepl?status.svg)](https://godoc.org/s.mcquay.me/dm/kvrepl)                         
+[![Go Report Card](https://goreportcard.com/badge/s.mcquay.me/dm/kvrepl)](https://goreportcard.com/report/s.mcquay.me/dm/kvrepl)
+
+A simple command line REPL (read-eval-print loop) that drives a simple in-memory key/value storage system. This system should also allow for nested transactions. A transaction can then be committed or aborted.

db.go

@@ -2,6 +2,8 @@ package kvrepl
 
 import "fmt"
 
+// DB is struct defining two maps, pkv (points to kv) and nest, which
+// aids figuring out how nested the commits are for current transaction
 type DB struct {
 	KV1  map[string]string
 	KV2  map[string]string
@@ -9,6 +11,7 @@ type DB struct {
 	nest int
 }
 
+// read reads a key out of a map and checks for parsing errors
 func read(args []string, kv map[string]string) (string, error) {
 	if len(args) != 1 {
 		return "", fmt.Errorf("incorrect usage: READ <key>")
@@ -20,6 +23,7 @@ func read(args []string, kv map[string]string) (string, error) {
 	return i, nil
 }
 
+// write writes key/value to map and checks for parsing errors
 func write(args []string, kv map[string]string) error {
 	if len(args) != 2 {
 		return fmt.Errorf("incorrect usage: WRITE <key> <value>")
@@ -28,6 +32,7 @@ func write(args []string, kv map[string]string) error {
 	return nil
 }
 
+// del deletes a key from map and checks for parsing errors
 func del(args []string, kv map[string]string) error {
 	if len(args) != 1 {
 		return fmt.Errorf("incorrect usage: DELETE <key>")
@@ -40,6 +45,7 @@ func del(args []string, kv map[string]string) error {
 	return nil
 }
 
+// whichDB returns which db is currently being written to
 func whichDB(d *DB) map[string]string {
 	if d.PKV {
 		return d.KV1

parse.go

@@ -6,6 +6,8 @@ import (
 	"strings"
 )
 
+// Parse decides what commands to run and returns a string containing the
+// value of a read or an error if one occured.
 func Parse(s string, d *DB) (string, error) {
 	args := strings.Split(s, " ")