Save and Save path on a PDF or image pane are refused, "a PDF pane has no text to save", never a silent success

A bare Save on a PDF or an image did nothing, and `Save path` returned
without writing, both answered as done. Such a pane shows a file it does
not hold as text, so there is nothing of its own to write. Save now
refuses it with why ("Save: a PDF pane has no text to save", or an image
pane's), and so fails the write that asked.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index 27a1d36d..4d257a9e 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -986,6 +986,11 @@ pub const ClipReplace = struct {
 pub const Save = struct {
     pub const takes_arg = true;
     pub fn run(c: Ctx) void {
+        // A PDF or an image shows a file it does not hold as text: there
+        // is nothing of its own to write, bare or to a path. Said, never a
+        // silent success.
+        if (c.pane.file == null and !c.pane.isTerminal())
+            return c.p.reportFailure(c.id, if (c.pane.hasPdf()) "Save: a PDF pane has no text to save" else "Save: an image pane has no text to save");
         const path = std.mem.trim(u8, c.arg orelse "", " \t\r\n");
         if (path.len > 0) return exec.saveTo(c.p, c.id, path);
         if (c.pane.file) |file| if (file.output == null) return exec.saveFile(c.p, c.id);