Implement subcommand to migrate JSON (#173)

* Add migration mode

* Add example for old schema

* Keep indent

* Revert "Keep indent"

This reverts commit 22d185a.

* Do not prior on migrate future

cmd/selfup/main.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 
 	"github.com/fatih/color"
+	"github.com/kachick/selfup/internal/migrate"
 	"github.com/kachick/selfup/internal/runner"
 	"golang.org/x/term"
 	"golang.org/x/xerrors"
@@ -41,6 +42,7 @@ func main() {
 $ selfup run .github/workflows/*.yml
 $ selfup run --prefix='# Update with this json: ' --skip-by='nix run' .github/workflows/*.yml
 $ selfup list .github/workflows/*.yml
+$ selfup migrate .github/workflows/have_beta_schema.yml
 $ selfup --version
 `
 
@@ -72,6 +74,21 @@ $ selfup --version
 	subCommand := os.Args[1]
 	isListMode := subCommand == "list"
 	isRunMode := subCommand == "run"
+	isMigrateMode := subCommand == "migrate"
+	if isMigrateMode {
+		paths := os.Args[2:]
+		for _, path := range paths {
+			isMigrated, err := migrate.Migrate(path)
+			if err != nil {
+				log.Fatalf("%+v", err)
+			}
+			if isMigrated {
+				log.Println(path + ": migrated schema beta -> v1")
+			}
+		}
+
+		return
+	}
 
 	if !(isListMode || isRunMode) {
 		flag.Usage()

examples/beta_schema.yml

@@ -0,0 +1,9 @@
+jobs:
+  dprint:
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
+      - uses: dprint/check@2f1cf31537886c3bfb05591c031f7744e48ba8a1 # v2.2
+        with:
+          dprint-version: '0.45.0' # selfup { "regex": "\\d[^']+", "script": "dprint --version | cut -d ' ' -f 2" }

internal/migrate/migrate.go

@@ -0,0 +1,77 @@
+package migrate
+
+import (
+	"bufio"
+	"encoding/json"
+	"io/fs"
+	"os"
+	"strings"
+)
+
+type V1Schema struct {
+	Extract   string   `json:"extract"`
+	Command   []string `json:"replacer"`
+	Nth       int      `json:"nth,omitempty"`
+	Delimiter string   `json:"delimiter,omitempty"`
+}
+
+type BetaSchema struct {
+	Regex  string `json:"regex"`
+	Script string `json:"script"`
+}
+
+const defaultPrefix string = "# selfup "
+
+func Migrate(path string) (bool, error) {
+	newLines := []string{}
+	isMigrated := false
+	bytes, err := os.ReadFile(path)
+	if err != nil {
+		return false, err
+	}
+	scanner := bufio.NewScanner(strings.NewReader(string(bytes)))
+	for scanner.Scan() {
+		line := scanner.Text()
+		head, tail, found := strings.Cut(line, defaultPrefix)
+		if !found {
+			newLines = append(newLines, line)
+			continue
+		}
+
+		beta := &BetaSchema{}
+		err := json.Unmarshal([]byte(tail), beta)
+		if err != nil {
+			return false, err
+		}
+		if beta.Regex == "" || beta.Script == "" {
+			newLines = append(newLines, line)
+			continue
+		}
+		v1 := V1Schema{
+			Extract:   beta.Regex,
+			Command:   []string{"bash", "-c", beta.Script},
+			Nth:       0,
+			Delimiter: "",
+		}
+		migrated, err := json.Marshal(v1)
+		if err != nil {
+			return false, err
+		}
+		newLines = append(newLines, head+defaultPrefix+string(migrated))
+		if !isMigrated {
+			isMigrated = true
+		}
+	}
+	if scanner.Err() != nil {
+		return false, err
+	}
+
+	if isMigrated {
+		err = os.WriteFile(path, []byte(strings.Join(newLines, "\n")), fs.ModePerm)
+		if err != nil {
+			return true, err
+		}
+	}
+
+	return isMigrated, nil
+}