boot v2 progress: disks, ssh, success...

regexp.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"log"
+	"regexp"
+)
+
+func regexpSelectN(n int, regexps []string, names []string) (matches []string) {
+	if n <= 0 {
+		matches = make([]string, 0)
+	} else {
+		matches = make([]string, 0, n)
+	}
+
+	res := make([]*regexp.Regexp, 0, len(regexps))
+	for _, reStr := range regexps {
+		re, err := regexp.Compile(reStr)
+		if err != nil {
+			log.Printf("warning: invalid regexp ignored: %q: %v", reStr, err)
+			continue
+		}
+		res = append(res, re)
+	}
+
+namesLoop:
+	for _, name := range names {
+		if len(matches) == n {
+			break
+		}
+		for _, re := range res {
+			if re.MatchString(name) {
+				matches = append(matches, name)
+				continue namesLoop
+			}
+		}
+	}
+
+	return
+}