refactor(editor): extract initWomDefaults + saveWomOrError

Two more boilerplate patterns repeated across cli_gen_mesh.cpp:

  • init: 64 sites set wom.name = path-stem and wom.version = 3
    in 3 lines. Hoisted to initWomDefaults(wom, base) — 1 line.

  • save: 65 sites had identical 5-line "if save fails, fprintf
    stderr and return 1" blocks. Hoisted to saveWomOrError(wom,
    base, cmdName) returning bool, used as
    `if (!saveWomOrError(...)) return 1;` — also 1 line.

Net cli_gen_mesh.cpp drops by ~254 lines (from 6424 to 6170).
Output bytes verified identical: firepit surface area 2.1100
m² unchanged, cube vertex/index/bounds counts unchanged.

After this batch's prior helpers (addFlatBox, addVertex,
stripExt, finalizeAsSingleBatch, parseOpt*), a typical new
gen-mesh handler now needs zero copy-paste boilerplate to
get a working primitive — every shared bit lives in
cli_box_emitter.hpp and cli_arg_parse.hpp.

tools/editor/cli_box_emitter.hpp

@@ -3,12 +3,37 @@
 #include "pipeline/wowee_model.hpp"
 #include <glm/glm.hpp>
 #include <cstdint>
+#include <cstdio>
+#include <filesystem>
 #include <string>
 
 namespace wowee {
 namespace editor {
 namespace cli {
 
+// Initialize a fresh WoweeModel with the canonical procedural-
+// primitive defaults: name derived from the base path's stem and
+// version 3 (current). 64 handlers in cli_gen_mesh.cpp open-coded
+// this 3-line block before extraction.
+inline void initWomDefaults(wowee::pipeline::WoweeModel& wom,
+                            const std::string& base) {
+    wom.name = std::filesystem::path(base).stem().string();
+    wom.version = 3;
+}
+
+// Save a WoweeModel and report a stderr message on failure.
+// Returns true on success so the caller can do
+// `if (!saveWomOrError(...)) return 1;`. The cmdName is included
+// in the error message for context.
+inline bool saveWomOrError(const wowee::pipeline::WoweeModel& wom,
+                           const std::string& base,
+                           const char* cmdName) {
+    if (wowee::pipeline::WoweeModelLoader::save(wom, base)) return true;
+    std::fprintf(stderr, "%s: failed to save %s.wom\n",
+                 cmdName, base.c_str());
+    return false;
+}
+
 // Strip a file-extension suffix from a base path if present. Used
 // pervasively by --gen-mesh-* / --bake-* / --info-* handlers that
 // accept either `path/foo` or `path/foo.ext` as input — the loader