Add --fail-under-line and --fail-under-branch options to return exit …

…status 2 under a threshold

scripts/gcovr

@@ -989,7 +989,7 @@ def print_text_report(covdata):
     OUTPUT.write(" " * 27 + "GCC Code Coverage Report\n")
     if options.root is not None:
         OUTPUT.write("Directory: " + options.root + "\n")
-    
+
     OUTPUT.write("-" * 78 + '\n')
     a = options.show_branch and "Branches" or "Lines"
     b = options.show_branch and "Taken" or "Exec"
@@ -1025,11 +1025,10 @@ def print_text_report(covdata):
     if options.output:
         OUTPUT.close()
 
-
 #
-# Prints a small report to the standard output
+# Get global statistics
 #
-def print_summary(covdata):
+def get_global_stats(covdata):
     lines_total = 0
     lines_covered = 0
     branches_total = 0
@@ -1052,6 +1051,17 @@ def print_summary(covdata):
     percent_branches = branches_total and \
         (100.0 * branches_covered / branches_total)
 
+    return (lines_total, lines_covered, percent,
+            branches_total, branches_covered, percent_branches)
+
+#
+# Prints a small report to the standard output
+#
+def print_summary(covdata):
+    (lines_total, lines_covered, percent,
+        branches_total, branches_covered,
+        percent_branches) = get_global_stats(covdata)
+
     lines_out = "lines: %0.1f%% (%s out of %s)\n" % (
         percent, lines_covered, lines_total
     )
@@ -1062,6 +1072,19 @@ def print_summary(covdata):
     sys.stdout.write(lines_out)
     sys.stdout.write(branches_out)
 
+#
+# Exits with status 2 if below threshold
+#
+def fail_under(covdata, threshold_line, threshold_branch):
+    (lines_total, lines_covered, percent,
+        branches_total, branches_covered,
+        percent_branches) = get_global_stats(covdata)
+
+    if percent < threshold_line:
+        sys.exit(2)
+    if percent_branches < threshold_branch:
+        sys.exit(2)
+
 #
 # CSS declarations for the HTML output
 #
@@ -1264,19 +1287,19 @@ css = Template('''
         border-right: 1px gray solid;
         background-color: lightgray;
     }
-    
+
     span.takenBranch
     {
         color: ${takenBranch_color}!important;
         cursor: help;
     }
-    
+
     span.notTakenBranch
     {
         color: ${notTakenBranch_color}!important;
         cursor: help;
     }
-    
+
     .src
     {
         padding-left: 12px;
@@ -1593,7 +1616,7 @@ def print_html_report(covdata, details):
             else:
                 cdata._sourcefile = \
                     ttmp[0] + '.' + longname + longname_hash + '.html'
-            # we add a hash at the end and attempt to shorten the 
+            # we add a hash at the end and attempt to shorten the
             # filename if it exceeds common filesystem limitations
             if len(os.path.basename(cdata._sourcefile)) < 256:
                 break
@@ -2225,6 +2248,26 @@ parser.add_option(
     dest="print_summary",
     default=False
 )
+parser.add_option(
+    "--fail-under-line",
+    type="float",
+    metavar="MIN",
+    help="Exit with a status of 2 if the total line coverage is less "
+         "than MIN.",
+    action="store",
+    dest="fail_under_line",
+    default=0.0
+)
+parser.add_option(
+    "--fail-under-branch",
+    type="float",
+    metavar="MIN",
+    help="Exit with a status of 2 if the total branch coverage is less "
+         "than MIN.",
+    action="store",
+    dest="fail_under_branch",
+    default=0.0
+)
 parser.usage = "gcovr [options]"
 parser.description = \
     "A utility to run gcov and generate a simple report that summarizes " \
@@ -2314,10 +2357,10 @@ if len(args) == 1:
         search_paths = ["."]
     else:
         search_paths = [options.root]
-    
+
     if options.objdir is not None:
         search_paths.append(options.objdir)
-    
+
     datafiles = get_datafiles(search_paths, options)
 else:
     datafiles = get_datafiles(args[1:], options)
@@ -2346,3 +2389,6 @@ else:
 
 if options.print_summary:
     print_summary(covdata)
+
+if options.fail_under_line > 0.0 or options.fail_under_branch > 0.0:
+    fail_under(covdata, options.fail_under_line, options.fail_under_branch)