(WIP) Travis: Show new/changed uncovered lines

.travis/coverage_interpolate

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+
+import sys
+
+for line in sys.stdin:
+    try:
+        filename, no_filename = line.split(':')
+        start_and_end = no_filename.split(' ')[0]
+        start, end = start_and_end.split(',')
+        start_line = int(start.split('.')[0])
+        end_line = int(end.split('.')[0])
+    except ValueError:
+        print(line)
+        continue
+    for line_num in range(start_line, end_line+1):
+        print(filename + ':' + str(line_num) + ': Uncovered')

.travis/script

@@ -2,7 +2,7 @@
 
 # Upstream q is broken, and this also causes dns-prop279 to be broken.
 #travis_retry go get github.com/tcnksm/ghr github.com/mitchellh/gox gopkg.in/alecthomas/gometalinter.v2 github.com/miekg/exdns/q github.com/namecoin/dns-prop279
-travis_retry go get github.com/tcnksm/ghr github.com/mitchellh/gox gopkg.in/alecthomas/gometalinter.v2
+travis_retry go get github.com/tcnksm/ghr github.com/mitchellh/gox gopkg.in/alecthomas/gometalinter.v2 github.com/bradleyfalzon/revgrep/...
 
 go test -v -coverprofile coverage.out ./...
 RESULT=$?
@@ -12,10 +12,14 @@ if [ "$RESULT" != "0" ]; then
   return $RESULT
 fi
 
-# TODO: Maybe fail the build if new uncovered lines are added.
 echo "Uncovered lines:"
 echo ""
-grep -v -e " 1$" coverage.out
+grep -v -e " 1$" coverage.out | sed "s_github.com/namecoin/ncdns/__"
+echo ""
+
+echo "New/changed uncovered lines:"
+echo ""
+grep -v -e " 1$" coverage.out | sed "s_github.com/namecoin/ncdns/__" | ./.travis/coverage_interpolate | revgrep "${TRAVIS_BRANCH}"
 echo ""
 
 # Static analysis