const, if as a value, """ text over several lines, min/max/abs/clamp, import a/b and import x as y, the fs module

- const NAME = value (numbers, text, other constants; typed: const f32 G = 9.8), also module.NAME
- x := if c { a } else { b }
- """ ... """: the closing quotes' indentation goes from every line
- min, max, abs, clamp for any numbers, unless your own function has the name
- import ui/button (a module in a folder), import path as p
- fs: read_bytes, write_bytes, exists, is_dir, mkdir (with parents), list, remove_dir, data_dir(app)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016GzNP6r8dg6WDxUVZy8wjL

tests/new/fail/const_assign.fch

@@ -0,0 +1,5 @@
+// expect: is a constant; it can't be changed
+const W = 3
+fn main() {
+    W = 4
+}

tests/new/fail/const_call.fch

@@ -0,0 +1,6 @@
+// expect: a constant is made of numbers, text
+fn f() -> int { return 1 }
+const W = f()
+fn main() {
+    print(W)
+}

tests/new/fail/const_loop.fch

@@ -0,0 +1,6 @@
+// expect: is worked out from itself
+const A = B + 1
+const B = A
+fn main() {
+    print(A)
+}

tests/new/fail/ifvalue_else.fch

@@ -0,0 +1,4 @@
+// expect: an if that gives a value needs an else
+fn main() {
+    x := if true { 1 }
+}

tests/new/fail/ifvalue_types.fch

@@ -0,0 +1,4 @@
+// expect: both branches of the if have to give the same type
+fn main() {
+    x := if true { 1 } else { "one" }
+}

tests/new/fail/import_clash.fch

@@ -0,0 +1,5 @@
+// expect: is already used by another import
+import path
+import time as path
+fn main() {
+}

tests/new/fail/longstr_indent.fch

@@ -0,0 +1,6 @@
+// expect: is indented less than the closing
+fn main() {
+    s := """
+  a
+        """
+}

tests/new/lang_additions.fch

@@ -0,0 +1,33 @@
+// const, if as a value, min/max/abs/clamp, import a/b and import x as y, """ text
+import ui/button
+import path as p
+import ui/button as b2
+
+const W = 640
+const H = W / 2
+const f32 G = 9.8
+const TITLE = "Game " + "One"
+const NEG = -W
+
+fn main() {
+    print(W, H, G, TITLE, NEG, button.SIZE)
+    bt := button.make("ok")
+    button.Button other
+    print(bt.label, bt.w, other.w, b2.make("x").w)
+    print(p.base("/a/b.txt"))
+    x := 7
+    v := if x > 5 { "big" } else if x > 2 { "mid" } else { "small" }
+    f32 s = if x > 5 { 1.5 } else { 0.5 }
+    print(v, s, if x == 7 { x * 2 } else { 0 })
+    print(min(3, 9), max(2.5, 1), abs(-4), abs(-2.5), clamp(15, 0, 10), clamp(-3, 0, 10), min(5, 2, 8))
+    f32 sp = 2.0
+    print(clamp(sp * 3.0, 0.0, 5.0), max(u8(3), u8(200)))
+    shader := """
+        #version 330
+        void main() {
+            gl_Position = vec4(0.0);
+        }
+        """
+    print(shader)
+    print("""one "quoted" line""")
+}

tests/new/lang_additions.out

@@ -0,0 +1,11 @@
+640 320 9.8 Game One -640 3
+ok 30 30 30
+b.txt
+big 1.5 14
+3 2.5 4 2.5 10 0 2
+5 200
+#version 330
+void main() {
+    gl_Position = vec4(0.0);
+}
+one "quoted" line

tests/new/std_fs.fch

@@ -0,0 +1,23 @@
+// the fs module: bytes with NUL in them, folders, listing
+import fs
+
+fn main() -> ! {
+    root := "fs_test_dir"
+    try fs.mkdir(root + "/a/b")
+    print(fs.exists(root), fs.is_dir(root + "/a/b"), fs.is_dir("nope"))
+    data := [u8(0), u8(255), u8(13), u8(10), u8(65)]
+    try fs.write_bytes(root + "/a/blob.bin", data)
+    back := try fs.read_bytes(root + "/a/blob.bin")
+    print(back.len, back[0], back[1], back[4], str(back) == str(data))
+    write_file(root + "/z.txt", "z")
+    print(try fs.list(root))
+    print(try fs.list(root + "/a"))
+    print(fs.list("no_such_dir") or ["(none)"])
+    delete_file(root + "/a/blob.bin")
+    delete_file(root + "/z.txt")
+    try fs.remove_dir(root + "/a/b")
+    try fs.remove_dir(root + "/a")
+    try fs.remove_dir(root)
+    print(fs.exists(root))
+    fs.remove_dir(root) or { print("gone:", err) }
+}

tests/new/std_fs.out

@@ -0,0 +1,7 @@
+true true false
+5 0 255 65 true
+["a", "z.txt"]
+["b", "blob.bin"]
+["(none)"]
+false
+gone: can't remove the folder "fs_test_dir" (is it empty?)

tests/new/ui/button.fch

@@ -0,0 +1,7 @@
+// a module in a folder, for tests/new/lang_additions.fch (import ui/button)
+const SIZE = 3
+struct Button {
+    str label
+    int w = SIZE * 10
+}
+fn make(str l) -> Button { return Button(label: l) }