v1

src/main/CameraParser.js

@@ -0,0 +1,72 @@
+const { spawn } = require("child_process");
+const PathResolver = require("./PathResolver.js");
+
+const STR_CAMERA_MARKER = "CAMERAS_JSON:";
+
+const STR_PYTHON_EXPR = [
+    "import bpy, json, sys;",
+    "cams=[o.name for o in bpy.data.objects if o.type=='CAMERA'];",
+    "sys.stdout.write('CAMERAS_JSON:' + json.dumps(cams) + '\\n');",
+    "sys.stdout.flush()",
+].join("");
+
+const CameraParser = {
+    list_cameras: (str_blend_path) => {
+        return new Promise((resolve, reject) => {
+            let str_stdout = "";
+            let str_stderr = "";
+
+            let obj_process = spawn(PathResolver.get_blender_path(), [
+                "-b", str_blend_path,
+                "--python-expr", STR_PYTHON_EXPR,
+            ]);
+
+            obj_process.stdout.on("data", (obj_data) => {
+                str_stdout += obj_data.toString();
+            });
+
+            obj_process.stderr.on("data", (obj_data) => {
+                str_stderr += obj_data.toString();
+            });
+
+            obj_process.on("close", (nb_code) => {
+                if (nb_code !== 0) {
+                    reject(new Error("Blender a quitte avec le code " + nb_code + " : " + str_stderr));
+                    return;
+                }
+
+                let list_cameras = CameraParser._parse_camera_output(str_stdout);
+                if (list_cameras === null) {
+                    console.error("[CameraParser] Stdout Blender:\n" + str_stdout.substring(str_stdout.length - 2000));
+                    reject(new Error("Impossible de parser les cameras. Verifiez que le fichier .blend contient des cameras."));
+                    return;
+                }
+
+                resolve(list_cameras);
+            });
+
+            obj_process.on("error", (obj_err) => {
+                reject(new Error("Impossible de lancer Blender. Verifiez qu'il est installe et accessible dans le PATH. " + obj_err.message));
+            });
+        });
+    },
+
+    _parse_camera_output: (str_stdout) => {
+        let list_lines = str_stdout.split("\n");
+        for (let str_line of list_lines) {
+            let nb_index = str_line.indexOf(STR_CAMERA_MARKER);
+            if (nb_index !== -1) {
+                let str_json = str_line.substring(nb_index + STR_CAMERA_MARKER.length).trim();
+                try {
+                    return JSON.parse(str_json);
+                } catch (obj_err) {
+                    console.error("[CameraParser] JSON parse error:", obj_err.message, "raw:", str_json);
+                    return null;
+                }
+            }
+        }
+        return null;
+    },
+};
+
+module.exports = CameraParser;