Single-file standalone Bun executables (#2879)

* Add LIEF

* Compile LIEF

* Implement support for embedding files on macOS

* proof of concept

* Add zstd

* Implement runtime support

* Move some code around

* Update .gitmodules

* Upgrade zig

https://github.com/ziglang/zig/pull/15278

* leftover

* leftover

* delete dead code

* Fix extname

* Revert "Upgrade zig"

This reverts commit dd968f30bf.

* Revert "leftover"

This reverts commit 7664de7686.

* Revert "leftover"

This reverts commit 498005be06.

* various fixes

* it works!

* leftover

* Make `zig build` a little faster

* give up on code signing support

* Support Linux & macOS

* Finish removing LIEF

* few more

* Add zstd to list of deps

* make it pretty

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

src/string_builder.zig

@@ -53,6 +53,36 @@ pub fn append(this: *StringBuilder, slice: string) string {
     return result;
 }
 
+pub fn add(this: *StringBuilder, len: usize) bun.StringPointer {
+    if (comptime Environment.allow_assert) {
+        assert(this.len <= this.cap); // didn't count everything
+        assert(this.ptr != null); // must call allocate first
+    }
+
+    const start = this.len;
+    this.len += len;
+
+    if (comptime Environment.allow_assert) assert(this.len <= this.cap);
+
+    return bun.StringPointer{ .offset = @truncate(u32, start), .length = @truncate(u32, len) };
+}
+pub fn appendCount(this: *StringBuilder, slice: string) bun.StringPointer {
+    if (comptime Environment.allow_assert) {
+        assert(this.len <= this.cap); // didn't count everything
+        assert(this.ptr != null); // must call allocate first
+    }
+
+    const start = this.len;
+    bun.copy(u8, this.ptr.?[this.len..this.cap], slice);
+    const result = this.ptr.?[this.len..this.cap][0..slice.len];
+    _ = result;
+    this.len += slice.len;
+
+    if (comptime Environment.allow_assert) assert(this.len <= this.cap);
+
+    return bun.StringPointer{ .offset = @truncate(u32, start), .length = @truncate(u32, slice.len) };
+}
+
 pub fn fmt(this: *StringBuilder, comptime str: string, args: anytype) string {
     if (comptime Environment.allow_assert) {
         assert(this.len <= this.cap); // didn't count everything
@@ -68,6 +98,25 @@ pub fn fmt(this: *StringBuilder, comptime str: string, args: anytype) string {
     return out;
 }
 
+pub fn fmtAppendCount(this: *StringBuilder, comptime str: string, args: anytype) bun.StringPointer {
+    if (comptime Environment.allow_assert) {
+        assert(this.len <= this.cap); // didn't count everything
+        assert(this.ptr != null); // must call allocate first
+    }
+
+    var buf = this.ptr.?[this.len..this.cap];
+    const out = std.fmt.bufPrint(buf, str, args) catch unreachable;
+    const off = this.len;
+    this.len += out.len;
+
+    if (comptime Environment.allow_assert) assert(this.len <= this.cap);
+
+    return bun.StringPointer{
+        .offset = @truncate(u32, off),
+        .length = @truncate(u32, out.len),
+    };
+}
+
 pub fn fmtCount(this: *StringBuilder, comptime str: string, args: anytype) void {
     this.cap += std.fmt.count(str, args);
 }
@@ -79,3 +128,11 @@ pub fn allocatedSlice(this: *StringBuilder) []u8 {
     }
     return ptr[0..this.cap];
 }
+
+pub fn writable(this: *StringBuilder) []u8 {
+    var ptr = this.ptr orelse return &[_]u8{};
+    if (comptime Environment.allow_assert) {
+        assert(this.cap > 0);
+    }
+    return ptr[this.len..this.cap];
+}