feat: add docfill mvp cli

cmd/docfill/main.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"xlsdoc/internal/docfill"
+)
+
+type varFlags map[string]string
+
+func main() {
+	os.Exit(run(os.Args[1:], os.Stdout, os.Stderr))
+}
+
+func run(args []string, stdout, stderr io.Writer) int {
+	if len(args) == 0 {
+		fmt.Fprintln(stderr, "docfill: missing command: run")
+		return 2
+	}
+	if args[0] != "run" {
+		fmt.Fprintf(stderr, "docfill: unknown command: %s\n", args[0])
+		return 2
+	}
+
+	result, code := runFill(args[1:], stderr)
+	if code != 0 {
+		return code
+	}
+
+	fmt.Fprintf(stdout, "generated %d file(s)\n", len(result.Files))
+	for _, file := range result.Files {
+		fmt.Fprintf(stdout, "- %s\n", file)
+	}
+	return 0
+}
+
+func runFill(args []string, stderr io.Writer) (docfill.RunResult, int) {
+	fs := flag.NewFlagSet("docfill run", flag.ContinueOnError)
+	fs.SetOutput(stderr)
+
+	var configPath string
+	var vars varFlags = make(map[string]string)
+	fs.SetOutput(io.Discard)
+	fs.StringVar(&configPath, "config", "", "path to task json")
+	fs.StringVar(&configPath, "c", "", "path to task json")
+	fs.Var(vars, "var", "template variable as key=value; repeatable")
+
+	if err := fs.Parse(args); err != nil {
+		fmt.Fprintf(stderr, "docfill: %v\n", err)
+		return docfill.RunResult{}, 2
+	}
+	if fs.NArg() > 0 {
+		fmt.Fprintf(stderr, "docfill: unexpected argument: %s\n", fs.Arg(0))
+		return docfill.RunResult{}, 2
+	}
+	if vars == nil {
+		vars = make(map[string]string)
+	}
+	if configPath == "" {
+		fmt.Fprintln(stderr, "docfill: missing --config")
+		fs.SetOutput(stderr)
+		fs.Usage()
+		return docfill.RunResult{}, 2
+	}
+
+	result, err := docfill.RunWithOptions(configPath, docfill.RunOptions{Vars: vars})
+	if err != nil {
+		fmt.Fprintf(stderr, "docfill: %v\n", err)
+		return docfill.RunResult{}, 1
+	}
+	return result, 0
+}
+
+func (v varFlags) String() string {
+	if len(v) == 0 {
+		return ""
+	}
+	parts := make([]string, 0, len(v))
+	for key, value := range v {
+		parts = append(parts, key+"="+value)
+	}
+	return strings.Join(parts, ",")
+}
+
+func (v varFlags) Set(value string) error {
+	key, val, ok := strings.Cut(value, "=")
+	if !ok || strings.TrimSpace(key) == "" {
+		return fmt.Errorf("invalid --var %q, want key=value", value)
+	}
+	v[strings.TrimSpace(key)] = val
+	return nil
+}