all: changes the line number arguments for "local" and "play" command

Previously, the "local" and "play" command only accept two kind of
arguments: one argument for executing single line or two arguments for
executing line range.
There are no options to executing multiple single line, multiple line
range, or combination of them.

This changes make the both commands accept list of lines or line range
where each separated by comma.
For example, to execute multiple, different single lines

   awwan local 4,8,12

To execute multiple line range,

   awwan local 4-8,12-16

Or to execute multiple lines and line range,

   awwan local 4,8,10-12

1 files changed, 23 insertions, 9 deletions

diff --git a/session.go b/session.go
index 8e3b64b..01f01c2 100644
--- a/session.go
+++ b/session.go
@@ -353,13 +353,13 @@ func (ses *Session) ExecLocal(req *Request, stmt *Statement) (err error) {
 
 // executeRequires run the "#require:" statements from line 0 until
 // the start argument in the local system.
-func (ses *Session) executeRequires(req *Request) (err error) {
+func (ses *Session) executeRequires(req *Request, pos linePosition) (err error) {
 	var (
-		x    int
 		stmt *Statement
+		x    int64
 	)
 
-	for x = 0; x < req.BeginAt; x++ {
+	for x = 0; x < pos.start; x++ {
 		stmt = req.script.requires[x]
 		if stmt == nil {
 			continue
@@ -375,10 +375,16 @@ func (ses *Session) executeRequires(req *Request) (err error) {
 	return nil
 }
 
-func (ses *Session) executeScriptOnLocal(req *Request) {
-	var err error
+func (ses *Session) executeScriptOnLocal(req *Request, pos linePosition) {
+	var max = int64(len(req.script.stmts))
+	if pos.start > max {
+		return
+	}
+	if pos.end == 0 {
+		pos.end = max - 1
+	}
 
-	for x := req.BeginAt; x <= req.EndAt; x++ {
+	for x := pos.start; x <= pos.end; x++ {
 		stmt := req.script.stmts[x]
 		if stmt == nil {
 			continue
@@ -392,6 +398,7 @@ func (ses *Session) executeScriptOnLocal(req *Request) {
 
 		fmt.Fprintf(req.stdout, "\n>>> local: %3d: %s %s\n", x, stmt.cmd, stmt.args)
 
+		var err error
 		switch stmt.kind {
 		case statementKindDefault:
 			err = ses.ExecLocal(req, stmt)
@@ -411,10 +418,16 @@ func (ses *Session) executeScriptOnLocal(req *Request) {
 	}
 }
 
-func (ses *Session) executeScriptOnRemote(req *Request) {
-	var err error
+func (ses *Session) executeScriptOnRemote(req *Request, pos linePosition) {
+	var max = int64(len(req.script.stmts))
+	if pos.start > max {
+		return
+	}
+	if pos.end == 0 {
+		pos.end = max - 1
+	}
 
-	for x := req.BeginAt; x <= req.EndAt; x++ {
+	for x := pos.start; x <= pos.end; x++ {
 		stmt := req.script.stmts[x]
 		if stmt == nil {
 			continue
@@ -429,6 +442,7 @@ func (ses *Session) executeScriptOnRemote(req *Request) {
 		fmt.Fprintf(req.stdout, "\n>>> %s: %3d: %s %s\n",
 			ses.sshClient, x, stmt.cmd, stmt.args)
 
+		var err error
 		switch stmt.kind {
 		case statementKindDefault:
 			err = ses.sshClient.Execute(string(stmt.raw))