A body write to an image or a PDF says its body takes no writes, not that the pane has no text "(a terminal, ...)"

A terminal's body takes writes (its keys), so the old words named the
one kind that does. data, sel and dirty keep "this pane has no text",
which is true of all three.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

2 files changed, 12 insertions, 1 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 7d8a370d..1fcd7a6d 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -4065,3 +4065,11 @@ test "a Save whose directory is missing because one above refuses says permissio
     p.saveFailed(0, "/tmp/pardes-surely-missing-dir/f.txt", error.FileNotFound);
     try testing.expect(th.logHas(p, "no such directory"));
 }
+
+test "a body write to an image pane says its body takes none, not that terminals have no text" {
+    const p = try withFile(testing.allocator, "x\n");
+    defer p.deinit();
+    const doc = try p.newDocPane(p.freeSlot().?);
+    doc.image = .{ .path = try p.gpa.dupe(u8, "/tmp/pardes-pic.ppm") };
+    try testing.expectEqualStrings(pane_files.e_no_body, wr(p, Node.of(doc.serial, .body), "x").reply.ename);
+}
diff --git a/src/ninep/pane.zig b/src/ninep/pane.zig
index 3963c605..6a6b444f 100644
--- a/src/ninep/pane.zig
+++ b/src/ninep/pane.zig
@@ -662,7 +662,7 @@ fn writeBody(p: *Pardes, req: Req, id: usize, pane: *Pane) Reply {
     if (req.data.len == 0) return .{ .tag = req.tag, .written = 0 };
     if (pane.file == null) {
         // An image's or a PDF's body is no text a write goes into.
-        if (!pane.isTerminal()) return tree.failText(req.tag, E.INVAL, e_no_text);
+        if (!pane.isTerminal()) return tree.failText(req.tag, E.INVAL, e_no_body);
         const take = wholeUtf8(req.data);
         p.emitWrite(id, req.data[0..take]);
         return .{ .tag = req.tag, .written = @intCast(take) };
@@ -760,6 +760,9 @@ pub fn applyTagTruncation(p: *Pardes, pane: *Pane) void {
 
 /// A write only text takes, to a pane with none: said, as every EINVAL is.
 pub const e_no_text = "invalid write: this pane has no text (a terminal, an image or a PDF)";
+/// A body write to a pane whose body is a picture: a terminal's takes one
+/// (its keys), so the word is not "no text".
+pub const e_no_body = "invalid write: an image's or a PDF's body takes no writes";
 
 fn writeData(p: *Pardes, req: Req, pane: *Pane) Reply {
     if (fileOf(pane) == null) return tree.failText(req.tag, E.INVAL, e_no_text);