From a5526c8561b24bfc502b155e9c56639239a0b0dd Mon Sep 17 00:00:00 2001
From: Jonathan Gautheron <alpherz@gmail.com>
Date: Thu, 24 Dec 2015 12:31:48 +0100
Subject: [PATCH] Implement -ignore

---
 README.md  |  1 +
 gocyclo.go | 29 ++++++++++++++++++++---------
 2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index b2ec36a..dd2cb84 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ Examples:
     $ gocyclo -top 10 src/
     $ gocyclo -over 25 docker
     $ gocyclo -avg .
+    $ gocyclo -ignore "_test|Godeps" .
 
 The output fields for each line are:
 
diff --git a/gocyclo.go b/gocyclo.go
index 00ab50d..609388f 100644
--- a/gocyclo.go
+++ b/gocyclo.go
@@ -28,6 +28,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"regexp"
 	"sort"
 	"strings"
 )
@@ -37,11 +38,12 @@ Usage:
         gocyclo [flags] <Go file or directory> ...
 
 Flags:
-        -over N   show functions with complexity > N only and
-                  return exit code 1 if the set is non-empty
-        -top N    show the top N most complex functions only
-        -avg      show the average complexity over all functions,
-                  not depending on whether -over or -top are set
+        -over N         show functions with complexity > N only and
+                        return exit code 1 if the set is non-empty
+        -top N          show the top N most complex functions only
+        -avg            show the average complexity over all functions,
+                        not depending on whether -over or -top are set
+        -ignore REGEX   exclude files matching the given regular expression
 
 The output fields for each line are:
 <complexity> <package> <function> <file:row:column>
@@ -53,9 +55,10 @@ func usage() {
 }
 
 var (
-	over = flag.Int("over", 0, "show functions with complexity > N only")
-	top  = flag.Int("top", -1, "show the top N most complex functions only")
-	avg  = flag.Bool("avg", false, "show the average complexity")
+	over   = flag.Int("over", 0, "show functions with complexity > N only")
+	top    = flag.Int("top", -1, "show the top N most complex functions only")
+	avg    = flag.Bool("avg", false, "show the average complexity")
+	ignore = flag.String("ignore", "", "exclude files matching the given regular expression")
 )
 
 func main() {
@@ -98,6 +101,14 @@ func isDir(filename string) bool {
 	return err == nil && fi.IsDir()
 }
 
+func isIgnored(path string) bool {
+	if len(*ignore) == 0 {
+		return false
+	}
+	match, err := regexp.MatchString(*ignore, path)
+	return err == nil && match
+}
+
 func analyzeFile(fname string, stats []stat) []stat {
 	fset := token.NewFileSet()
 	f, err := parser.ParseFile(fset, fname, nil, 0)
@@ -109,7 +120,7 @@ func analyzeFile(fname string, stats []stat) []stat {
 
 func analyzeDir(dirname string, stats []stat) []stat {
 	filepath.Walk(dirname, func(path string, info os.FileInfo, err error) error {
-		if err == nil && !info.IsDir() && strings.HasSuffix(path, ".go") {
+		if err == nil && !info.IsDir() && strings.HasSuffix(path, ".go") && !isIgnored(path+info.Name()) {
 			stats = analyzeFile(path, stats)
 		}
 		return err