load sqlite from cli

justfile

@@ -28,7 +28,7 @@ build:
 #     # zig build -Dtarget=wasm32-emscripten
 
 run:
-    nixGL zig build run
+    nixGL zig build run -- {{ justfile_directory() }}/life.sqlite3
 
 test:
     zig build test

src/main.zig

@@ -4,8 +4,49 @@ const c = @cImport({
     @cInclude("sqlite3.h");
 });
 
+const StateTag = enum {
+    unloaded,
+    loaded,
+};
+
+const State = union(StateTag) {
+    unloaded: void,
+    loaded: *c.sqlite3,
+};
+
+fn loadSqlite(path: [:0]const u8) State {
+    var db_opt: ?*c.sqlite3 = undefined;
+
+    const result = c.sqlite3_open(path.ptr, &db_opt);
+    if (result != c.SQLITE_OK) {
+        std.debug.print("[SQLite] err {}: {s}\n", .{ result, c.sqlite3_errmsg(db_opt) });
+        _ = c.sqlite3_close(db_opt);
+        return State{ .unloaded = {} };
+    }
+
+    if (db_opt) |db| {
+        std.debug.print("[SQLite] Success\n", .{});
+        return State{ .loaded = db };
+    }
+
+    return State{ .unloaded = {} };
+}
+
 pub fn main() !void {
-    const alloc = std.heap.page_allocator;
+    var state = State{ .unloaded = {} };
+
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const alloc = gpa.allocator();
+
+    const args = try std.process.argsAlloc(alloc);
+    defer std.process.argsFree(alloc, args);
+
+    std.debug.print("Arguments: {s}\n", .{args});
+
+    if (args.len > 1) {
+        state = loadSqlite(args[1]);
+    }
 
     const screen_width = 800;
     const screen_height = 450;
@@ -16,8 +57,6 @@ pub fn main() !void {
     // const ext = ".sqlite3";
     // @memcpy(file_dialog_state.filterExt[0..ext.len], ext);
 
-    var db: ?*c.sqlite3 = undefined;
-
     while (!raylib.WindowShouldClose()) {
         //
         // Update
@@ -31,14 +70,7 @@ pub fn main() !void {
                 // slices -> C-string (null-terminated)
                 const db_path = try std.fs.path.joinZ(alloc, &[_][]const u8{ dir, file });
                 defer alloc.free(db_path);
-
-                const result = c.sqlite3_open(db_path.ptr, &db);
-                if (result != c.SQLITE_OK or db == null) {
-                    std.debug.print("[SQLite] err {}: {s}\n", .{ result, c.sqlite3_errmsg(db) });
-                    _ = c.sqlite3_close(db);
-                } else {
-                    std.debug.print("[SQLite] Success\n", .{});
-                }
+                state = loadSqlite(db_path);
             }
             file_dialog_state.SelectFilePressed = false;
         }
@@ -51,7 +83,8 @@ pub fn main() !void {
             defer raylib.EndDrawing();
             raylib.ClearBackground(raylib.RAYWHITE);
 
-            {
+            switch (state) {
+                .unloaded => {
                     if (file_dialog_state.windowActive) raylib.GuiLock();
                     defer raylib.GuiUnlock();
 
@@ -59,6 +92,11 @@ pub fn main() !void {
                     if (raylib.GuiButton(.{ .x = (screen_width - button_size) / 2, .y = (screen_height - button_size) / 2, .width = 200, .height = 200 }, "Load db file") == 1) {
                         file_dialog_state.windowActive = true;
                     }
+                },
+
+                .loaded => |*db| {
+                    _ = db;
+                },
             }
 
             raylib.GuiWindowFileDialog(&file_dialog_state);