Add way to gen one sig

2 files changed, 15 insertions, 0 deletions

diff --git a/generator/README.md b/generator/README.md
index d0333c97..94d2af5b 100644
--- a/generator/README.md
+++ b/generator/README.md
@@ -17,6 +17,15 @@ To (re)build documentation for all the SIGs, run these commands:
 make all
 ```
 
+To build docs for one SIG, run these commands:
+
+```bash
+make SIG=sig-apps gen-doc
+make SIG=sig-testing gen-doc
+```
+
+where the `SIG` var refers to the directory being built.
+
 ## Adding custom content to your SIG's README
 
 If your SIG wishes to add custom content, you can do so by placing it within
diff --git a/generator/app.go b/generator/app.go
index e6335b0a..1ece9685 100644
--- a/generator/app.go
+++ b/generator/app.go
@@ -179,9 +179,15 @@ func writeLastGenerated(f *os.File) {
 }
 
 func createReadmeFiles(ctx SigEntries) error {
+	selectedSig := os.Getenv("SIG")
 	for _, sig := range ctx.Sigs {
 		dirName := fmt.Sprintf("sig-%s", strings.ToLower(strings.Replace(sig.Name, " ", "-", -1)))
 
+		if selectedSig != "" && selectedSig != dirName {
+			fmt.Printf("Skipping %s\n", dirName)
+			continue
+		}
+
 		createDirIfNotExists(dirName)
 
 		prefix := sig.Contact.GithubTeamPrefix