Filter input data by network adapter name for #2

src/lib/getmac.coffee

@@ -7,20 +7,49 @@ isWindows = process.platform.indexOf('win') is 0
 macRegex = /(?:[a-z0-9]{2}[:\-]){5}[a-z0-9]{2}/ig
 zeroRegex = /(?:[0]{2}[:\-]){5}[0]{2}/
 
+# Filter By Interface
+# filterByInterface(iface, str)
+filterByInterface = (iface, str) ->
+	iface = new RegExp("#{iface}[:\\s]")
+	lines = str.split(/\r?\n/g)
+	result = ''
+	padding = null
+
+	for line in lines
+		if result.length is 0
+			result += line if iface.test(line)
+			continue
+		else if padding is null
+			match = /^(\s+)/.exec(line)
+			if match
+				result += "\n#{line}"
+				padding = new RegExp("^#{match[1]}")
+				continue
+		else
+			match = padding.exec(line)
+			if match
+				result += "\n#{line}"
+				continue
+		break
+
+	result
+
 # Get Mac
 # next(err,macAddress)
 getMac = (opts, next) ->
 	# Prepare
 	[opts, next] = extractOptsAndCallback(opts, next)
-	{data} = opts
+	{data, iface} = opts
 	data ?= null
+	iface ?= null
 
 	# Command
 	command = if isWindows then "getmac" else "ifconfig -a || ip link"
 
 	# Extract Mac
 	extractMac = (data, next) ->
 		# Prepare
+		data = filterByInterface(iface, data) if iface
 		result = null
 
 		# Find a valid mac address

src/test/everything-test.coffee

@@ -51,6 +51,13 @@ joe.describe 'getmac', (describe,it) ->
 				expect(macAddress).to.eql('00:18:31:8A:41:C6')
 				return done()
 
+		it 'got the mac address of eth0 successfully', (done) ->
+			getMac {data, iface: 'eth0'}, (err, macAddress) ->
+				return done(err) if err
+				expect(err).to.be.null
+				expect(macAddress).to.eql('00:18:31:8A:41:C6')
+				return done()
+
 	describe 'preset ifconfig', (describe,it) ->
 		data = """
 			lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
@@ -82,6 +89,13 @@ joe.describe 'getmac', (describe,it) ->
 				expect(macAddress).to.eql('b8:8d:12:07:6b:ac')
 				return done()
 
+		it 'got the mac address of p2p0 successfully', (done) ->
+			getMac {data, iface: 'p2p0'}, (err, macAddress) ->
+				return done(err)  if err
+				expect(err).to.be.null
+				expect(macAddress).to.eql('0a:8d:12:07:6a:bc')
+				return done()
+
 	describe 'preset ip link', (describe,it) ->
 		data = """
 			1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
@@ -101,6 +115,13 @@ joe.describe 'getmac', (describe,it) ->
 				expect(macAddress).to.eql('bc:76:4e:20:7d:dd')
 				return done()
 
+		it 'got the mac address of eth1 successfully', (done) ->
+			getMac {data, iface: 'eth1'}, (err, macAddress) ->
+				return done(err)  if err
+				expect(err).to.be.null
+				expect(macAddress).to.eql('bc:76:4e:20:99:be')
+				return done()
+
 	describe 'system', (describe,it) ->
 		it 'got the default mac address successfully', (done) ->
 			getMac (err, macAddress) ->