make bit release bump gracefully handle invalid tags and no prior tags.

closes #101

cmd/cmd_test.go

@@ -102,6 +102,21 @@ func TestAllBitAndGitSubCommands(t *testing.T) {
 	}
 }
 
+func TestGenBumpedSemVersion(t *testing.T) {
+	reality, err := GenBumpedSemVersion(`v1.0.1`)
+	assert.Equal(t, "v1.0.2", reality, "expected minor version to increment by 1")
+
+	reality, err = GenBumpedSemVersion(`1.0.1`)
+	assert.Equal(t, "1.0.2", reality, "expected minor version to increment by 1")
+
+	reality, err = GenBumpedSemVersion(`nonincrementaltag`)
+	assert.Error(t, err, "expected an error since the raw tag is invalid")
+
+	_, err = GenBumpedSemVersion("\n")
+	assert.Error(t, err, "expected an error since there was no tag")
+
+}
+
 func TestParseManPage(t *testing.T) {
 	reality := parseManPage("rebase")
 	assert.NotContains(t, reality, "GIT-REBASE(1)")

cmd/release.go

@@ -1,8 +1,10 @@
 package cmd
 
 import (
-	"log"
+	"fmt"
+	"os/exec"
 
+	"github.com/rs/zerolog/log"
 	"github.com/spf13/cobra"
 )
 
@@ -12,14 +14,23 @@ var releaseCmd = &cobra.Command{
 	Short: "Commit unstaged changes, bump minor tag, push",
 	Long:  ``,
 	Run: func(cmd *cobra.Command, args []string) {
+		var err error
 		version := args[0]
 		if version == "bump" {
-			version = GenBumpedSemVersion()
+			rawGitTagOutput, err := exec.Command("/bin/sh", "-c", `git for-each-ref --format="%(refname:short)" --sort=-authordate --count=1 refs/tags`).CombinedOutput()
+			if err != nil {
+				log.Debug().Err(err).Send()
+			}
+			version, err = GenBumpedSemVersion(string(rawGitTagOutput))
+			if err != nil {
+				fmt.Println(err)
+				return
+			}
 		}
 		save("")
-		err := tagCurrentBranch(version)
+		err = tagCurrentBranch(version)
 		if err != nil {
-			log.Println(err)
+			fmt.Println(err)
 			return
 		}
 		RunInTerminalWithColor("git", []string{"push", "--force-with-lease"})

cmd/util.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"github.com/chriswalz/complete/v3"
 	"os"
@@ -109,18 +110,21 @@ func toStructuredBranchList(rawBranchData string) []*Branch {
 	}).([]*Branch)
 }
 
-func GenBumpedSemVersion() string {
-	msg, err := exec.Command("/bin/sh", "-c", `git for-each-ref --format="%(refname:short)" --sort=-authordate --count=1 refs/tags`).CombinedOutput()
-	if err != nil {
-		log.Debug().Err(err).Send()
-	}
-	out := string(msg)
+func GenBumpedSemVersion(out string) (string, error) {
 	out = strings.TrimSpace(out)
+
+	// 0.0.1
+	if len(out) <= 0 {
+		return "", errors.New("no tags exists. Consider running `bit release 0.0.1`")
+	}
 	i := strings.LastIndex(out, ".")
 	minor, err := strconv.Atoi(out[i+1:])
+	if err != nil {
+		return "", err
+	}
 	minor++
 	out = out[:i] + "." + strconv.Itoa(minor)
-	return out
+	return out, nil
 }
 
 func AddCommandToShellHistory(cmd string, args []string) {