feature: relative local path implemented

Adds the ability for one to go like this:
mkdir ~/drive
cd drive
drive init
...
drive pull Photos
cd Photos
drive push

Author: Emmanuel Odeke

pull.go

@@ -19,6 +19,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 )
 
@@ -30,19 +31,29 @@ const (
 // directory, it recursively pulls from the remote if there are remote changes.
 // It doesn't check if there are remote changes if isForce is set.
 func (g *Commands) Pull() (err error) {
+	absPath := g.context.AbsPathOf(g.opts.Path)
+	var cwd string
+	if cwd, err = os.Getwd(); err != nil {
+		return
+	}
+	var relPath string
+	if relPath, err = filepath.Rel(absPath, cwd); err != nil {
+		return
+	}
+
+	relPath = strings.Join([]string{"", relPath}, "/")
 	var r, l *File
-	if r, err = g.rem.FindByPath(g.opts.Path); err != nil {
+	if r, err = g.rem.FindByPath(relPath); err != nil {
 		return
 	}
-	absPath := g.context.AbsPathOf(g.opts.Path)
 	localinfo, _ := os.Stat(absPath)
 	if localinfo != nil {
-		l = NewLocalFile(absPath, localinfo)
+		l = NewLocalFile(cwd, localinfo)
 	}
 
 	var cl []*Change
 	fmt.Println("Resolving...")
-	if cl, err = g.resolveChangeListRecv(false, g.opts.Path, r, l); err != nil {
+	if cl, err = g.resolveChangeListRecv(false, relPath, r, l); err != nil {
 		return
 	}
 

push.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	gopath "path"
 	"strings"
 
@@ -29,20 +30,28 @@ import (
 // It doesn't check if there are local changes if isForce is set.
 func (g *Commands) Push() (err error) {
 	absPath := g.context.AbsPathOf(g.opts.Path)
-	r, err := g.rem.FindByPath(g.opts.Path)
-	if err != nil && err != ErrPathNotExists {
-		return err
+	var cwd string
+	if cwd, err = os.Getwd(); err != nil {
+		return
+	}
+	var relPath string
+	if relPath, err = filepath.Rel(absPath, cwd); err != nil {
+		return
+	}
+     
+	relPath = strings.Join([]string{"", relPath}, "/")
+	var r, l *File
+	if r, err = g.rem.FindByPath(relPath); err != nil {
+		return
 	}
-
-	var l *File
 	localinfo, _ := os.Stat(absPath)
 	if localinfo != nil {
-		l = NewLocalFile(absPath, localinfo)
+		l = NewLocalFile(cwd, localinfo)
 	}
 
 	fmt.Println("Resolving...")
 	var cl []*Change
-	if cl, err = g.resolveChangeListRecv(true, g.opts.Path, r, l); err != nil {
+	if cl, err = g.resolveChangeListRecv(true, relPath, r, l); err != nil {
 		return err
 	}