R3: --body-file <path>/- across body/comment carriers (#1474)

Co-authored-by: marcie <[email protected]>

packages/mosaic/framework/tools/git/issue-create.sh

@@ -10,6 +10,7 @@ source "$SCRIPT_DIR/detect-platform.sh"
 # Default values
 TITLE=""
 BODY=""
+BODY_FILE=""
 LABELS=""
 MILESTONE=""
 INTERACTIVE=false
@@ -100,6 +101,12 @@ while [[ $# -gt 0 ]]; do
             BODY="$2"
             shift 2
             ;;
+        --body-file)
+            # R3: body from file (or '-' = stdin); mutually exclusive with --body.
+            [[ $# -ge 2 && "$2" != --* ]] || usage_error "option $1 requires a path (or - for stdin)"
+            BODY_FILE="$2"
+            shift 2
+            ;;
         -l|--labels)
             [[ $# -ge 2 && "$2" != - && "$2" != --* && ! "$2" =~ ^-[[:alnum:]] ]] || usage_error "option $1 requires a value (option-like values are rejected; bare - is reserved)"
             LABELS="$2"
@@ -124,6 +131,19 @@ while [[ $# -gt 0 ]]; do
     esac
 done
 
+# R3 (2026-08-29): resolve --body-file into BODY (file or stdin '-');
+# exclusive with an explicit --body/--comment value.
+if [[ -n "$BODY_FILE" ]]; then
+    [[ -z "$BODY" ]] || usage_error "--body-file and --body are mutually exclusive"
+    if [[ "$BODY_FILE" == "-" ]]; then
+        BODY=$(cat) || usage_error "could not read body from stdin"
+    else
+        [[ -r "$BODY_FILE" ]] || usage_error "body file not readable: $BODY_FILE"
+        BODY=$(cat "$BODY_FILE") || usage_error "could not read body file: $BODY_FILE"
+    fi
+fi
+
+
 if [[ "$INTERACTIVE" == true ]]; then
     [[ -n "$TITLE" ]] || read -r -p "Issue title: " TITLE
     [[ -n "$BODY" ]] || read -r -p "Issue body (optional): " BODY || true