Split shell into more files (#18793)

src/shell/RefCountedStr.zig

@@ -0,0 +1,46 @@
+refcount: u32 = 1,
+len: u32 = 0,
+ptr: [*]const u8 = undefined,
+
+const debug = bun.Output.scoped(.RefCountedEnvStr, true);
+
+pub fn init(slice: []const u8) *RefCountedStr {
+    debug("init: {s}", .{slice});
+    const this = bun.default_allocator.create(RefCountedStr) catch bun.outOfMemory();
+    this.* = .{
+        .refcount = 1,
+        .len = @intCast(slice.len),
+        .ptr = slice.ptr,
+    };
+    return this;
+}
+
+pub fn byteSlice(this: *RefCountedStr) []const u8 {
+    if (this.len == 0) return "";
+    return this.ptr[0..this.len];
+}
+
+pub fn ref(this: *RefCountedStr) void {
+    this.refcount += 1;
+}
+
+pub fn deref(this: *RefCountedStr) void {
+    this.refcount -= 1;
+    if (this.refcount == 0) {
+        this.deinit();
+    }
+}
+
+fn deinit(this: *RefCountedStr) void {
+    debug("deinit: {s}", .{this.byteSlice()});
+    this.freeStr();
+    bun.default_allocator.destroy(this);
+}
+
+fn freeStr(this: *RefCountedStr) void {
+    if (this.len == 0) return;
+    bun.default_allocator.free(this.ptr[0..this.len]);
+}
+
+const RefCountedStr = @This();
+const bun = @import("root").bun;