fn: rename from fnctl (#321)

* fn: rename from fnctl

* fn: predicting the release version for installer

* fn: predicting the release version for installer

fn/bump.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	bumper "github.com/giantswarm/semver-bump/bump"
+	"github.com/giantswarm/semver-bump/storage"
+	"github.com/urfave/cli"
+)
+
+var (
+	initialVersion = "0.0.1"
+)
+
+func bump() cli.Command {
+	cmd := bumpcmd{commoncmd: &commoncmd{}}
+	flags := append([]cli.Flag{}, cmd.flags()...)
+	return cli.Command{
+		Name:   "bump",
+		Usage:  "bump function version",
+		Flags:  flags,
+		Action: cmd.scan,
+	}
+}
+
+type bumpcmd struct {
+	*commoncmd
+}
+
+func (b *bumpcmd) scan(c *cli.Context) error {
+	b.commoncmd.scan(b.walker)
+	return nil
+}
+
+func (b *bumpcmd) walker(path string, info os.FileInfo, err error) error {
+	walker(path, info, err, b.bump)
+	return nil
+}
+
+// bump will take the found valid function and bump its version
+func (b *bumpcmd) bump(path string) error {
+	fmt.Fprintln(b.verbwriter, "bumping version for", path)
+
+	funcfile, err := parsefuncfile(path)
+	if err != nil {
+		return err
+	}
+
+	funcfile.Name = cleanImageName(funcfile.Name)
+	if funcfile.Version == "" {
+		funcfile.Version = initialVersion
+	}
+
+	s, err := storage.NewVersionStorage("local", funcfile.Version)
+	if err != nil {
+		return err
+	}
+
+	version := bumper.NewSemverBumper(s, "")
+	newver, err := version.BumpPatchVersion("", "")
+	if err != nil {
+		return err
+	}
+
+	funcfile.Version = newver.String()
+
+	if err := storefuncfile(path, funcfile); err != nil {
+		return err
+	}
+
+	fmt.Println("Bumped to version", funcfile.Version)
+	return nil
+}
+
+func cleanImageName(name string) string {
+	if i := strings.Index(name, ":"); i != -1 {
+		name = name[:i]
+	}
+
+	return name
+}