Merge pull request #1370 from glaszig/skip-ci-variants

skip build with any combination of "skip" and "ci"

controller/hook.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"regexp"
 
 	log "github.com/Sirupsen/logrus"
 	"github.com/drone/drone/engine"
@@ -19,6 +20,8 @@ import (
 	"github.com/drone/drone/yaml/matrix"
 )
 
+var skipRe = regexp.MustCompile(`\[(?i:ci *skip|skip *ci)\]`)
+
 func PostHook(c *gin.Context) {
 	remote_ := remote.FromContext(c)
 
@@ -38,10 +41,11 @@ func PostHook(c *gin.Context) {
 		return
 	}
 
-	// a build may be skipped if the text [CI SKIP]
-	// is found inside the commit message
-	if strings.Contains(build.Message, "[CI SKIP]") {
-		log.Infof("ignoring hook. [ci skip] found for %s")
+	// skip the build if any case-insensitive combination of the words "skip" and "ci"
+	// wrapped in square brackets appear in the commit message
+	skipMatch := skipRe.FindString(build.Message)
+	if len(skipMatch) > 0 {
+		log.Infof("ignoring hook. %s found in %s", skipMatch, build.Commit)
 		c.Writer.WriteHeader(204)
 		return
 	}

docs/build/build.md

@@ -48,4 +48,5 @@ image: index.docker.io/library/golang:1.4
 
 ## Skipping builds
 
-Skip a build by including the text `[CI SKIP]` in your commit message.
+Skip a build by including any combination of `ci` and `skip` wrapped in square brackets
+in your commit message. Examples: `[skip CI]` `[ci skip]`