3 files changed, 120 insertions, 0 deletions
diff --git a/internal/cli/cli.go b/internal/cli/cli.go
index 65be274..eb01039 100644
--- a/internal/cli/cli.go
+++ b/internal/cli/cli.go
@@ -51,6 +51,9 @@ Flags:
   -L, --liturgy          print the computed liturgical day (offline, no network) and exit
       --cal-new NAME     scaffold a custom calendar layer ~/.config/lectio/calendars/NAME.ini
       --cal-check NAME   validate a custom calendar layer NAME.ini and exit
+      --corpus-check X   validate a bible corpus (code, e.g. drb, or a path to
+                         a <code>.tsv) and exit; errors fail, coverage gaps warn
+      --json             with --corpus-check, print the report as JSON
       --rand, --rand-v   print a random verse and exit (uses default_version or -b VER;
                          bt has no corpus, so it falls back to a corpus version)
       --rand-ch          print a random chapter and exit
@@ -124,6 +127,8 @@ func Run(args []string, stdin io.Reader, stdout, stderr io.Writer) int {
 	var ref string
 	var liturgy bool
 	var calNew, calCheck string
+	var corpusCheck string
+	var jsonOut bool
 
 	fs := flag.NewFlagSet("lectio", flag.ContinueOnError)
 	fs.SetOutput(stderr)
@@ -172,6 +177,8 @@ func Run(args []string, stdin io.Reader, stdout, stderr io.Writer) int {
 	fs.BoolVar(&liturgy, "liturgy", false, "print the computed liturgical day (offline calendar engine) and exit")
 	fs.StringVar(&calNew, "cal-new", "", "scaffold a new calendar-layer file NAME.ini and exit")
 	fs.StringVar(&calCheck, "cal-check", "", "validate the calendar-layer file NAME.ini and exit")
+	fs.StringVar(&corpusCheck, "corpus-check", "", "validate a bible corpus (code or path to <code>.tsv) and exit")
+	fs.BoolVar(&jsonOut, "json", false, "with --corpus-check, print the report as JSON")
 
 	if err := fs.Parse(rest); err != nil {
 		return 2
@@ -203,6 +210,9 @@ func Run(args []string, stdin io.Reader, stdout, stderr io.Writer) int {
 	if calCheck != "" {
 		return runCalCheck(calCheck, stdout, stderr)
 	}
+	if corpusCheck != "" {
+		return runCorpusCheck(corpusCheck, jsonOut, stdout, stderr)
+	}
 
 	cfg, err := config.Load()
 	if err != nil {
diff --git a/internal/cli/corpus.go b/internal/cli/corpus.go
new file mode 100644
index 0000000..15a140c
--- /dev/null
+++ b/internal/cli/corpus.go
@@ -0,0 +1,69 @@
+package cli
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"path/filepath"
+	"strings"
+
+	"github.com/lukaszkasprzak/lectio/internal/bible"
+	"github.com/lukaszkasprzak/lectio/internal/config"
+)
+
+// runCorpusCheck handles --corpus-check <code|path>: validates a bible
+// corpus's sidecar + text (bible.CheckCorpus) and prints the report, plain or
+// (with asJSON) as JSON. It exits 1 if the report has any errors, 0
+// otherwise -- coverage warnings never fail the check.
+//
+// arg is either a bare corpus code, resolved against the user corpora dir
+// (config.CorporaDir(), which overrides the embedded built-ins the same way
+// normal rendering does), or a path to a <code>.tsv file -- its directory
+// becomes the user corpora dir for this run and its basename (minus ".tsv")
+// the code. The path form lets a corpus be validated before it is copied
+// into internal/bible/corpora/ (see scripts/corpus-validate.sh, make
+// add-corpus).
+func runCorpusCheck(arg string, asJSON bool, stdout, stderr io.Writer) int {
+	code := arg
+	if strings.Contains(arg, "/") || strings.HasSuffix(arg, ".tsv") {
+		dir := filepath.Dir(arg)
+		code = strings.TrimSuffix(filepath.Base(arg), ".tsv")
+		bible.SetUserCorporaDir(dir)
+	} else if dir, err := config.CorporaDir(); err == nil {
+		bible.SetUserCorporaDir(dir)
+	}
+
+	report := bible.CheckCorpus(code)
+
+	if asJSON {
+		enc := json.NewEncoder(stdout)
+		enc.SetIndent("", "  ")
+		if err := enc.Encode(report); err != nil {
+			fmt.Fprintln(stderr, "lectio:", err)
+			return 1
+		}
+	} else {
+		printCorpusReport(stdout, report)
+	}
+
+	if !report.OK() {
+		return 1
+	}
+	return 0
+}
+
+// printCorpusReport renders a CorpusReport as plain text: one line per
+// error/warning, then a summary line.
+func printCorpusReport(w io.Writer, r bible.CorpusReport) {
+	for _, e := range r.Errors {
+		fmt.Fprintf(w, "ERROR: %s\n", e)
+	}
+	for _, wm := range r.Warnings {
+		fmt.Fprintf(w, "WARNING: %s\n", wm)
+	}
+	if r.OK() {
+		fmt.Fprintf(w, "ok: %s (%d warning(s))\n", r.Code, len(r.Warnings))
+	} else {
+		fmt.Fprintf(w, "FAIL: %s (%d error(s), %d warning(s))\n", r.Code, len(r.Errors), len(r.Warnings))
+	}
+}
diff --git a/internal/cli/corpus_test.go b/internal/cli/corpus_test.go
new file mode 100644
index 0000000..0ed17bc
--- /dev/null
+++ b/internal/cli/corpus_test.go
@@ -0,0 +1,41 @@
+package cli
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/lukaszkasprzak/lectio/internal/bible"
+)
+
+func TestRunCorpusCheckPathArg(t *testing.T) {
+	t.Cleanup(func() { bible.SetUserCorporaDir("") })
+
+	var buf bytes.Buffer
+	if code := runCorpusCheck("../bible/testdata/corpora/badbook.tsv", false, &buf, &buf); code != 1 {
+		t.Fatalf("badbook: exit %d, want 1 (out=%s)", code, buf.String())
+	}
+	if !strings.Contains(buf.String(), "ERROR:") {
+		t.Errorf("expected an ERROR: line, got %s", buf.String())
+	}
+
+	buf.Reset()
+	if code := runCorpusCheck("../bible/testdata/corpora/good.tsv", false, &buf, &buf); code != 0 {
+		t.Fatalf("good: exit %d, want 0 (out=%s)", code, buf.String())
+	}
+	if !strings.Contains(buf.String(), "ok:") {
+		t.Errorf("expected an ok: summary, got %s", buf.String())
+	}
+}
+
+func TestRunCorpusCheckJSON(t *testing.T) {
+	t.Cleanup(func() { bible.SetUserCorporaDir("") })
+
+	var buf bytes.Buffer
+	if code := runCorpusCheck("../bible/testdata/corpora/badbook.tsv", true, &buf, &buf); code != 1 {
+		t.Fatalf("badbook --json: exit %d, want 1 (out=%s)", code, buf.String())
+	}
+	if !strings.Contains(buf.String(), `"Errors"`) {
+		t.Errorf("expected a JSON report, got %s", buf.String())
+	}
+}