refactor: obtain arguments through process initialization

std/process/arguments.test.hon

@@ -0,0 +1,27 @@
+import "@std/testing"
+import "@std/mem"
+
+borrows_supplied_arguments test {
+    first [3;0]mut u8 := ['r', 'u', 'n']
+    empty [0;0]u8 := []
+    spaced [9;0]u8 := ['t', 'w', 'o', ' ', 'w', 'o', 'r', 'd', 's']
+    pointers [3][*;0]u8 :: [(&first).ptr, (&empty).ptr, (&spaced).ptr]
+    args :: Args{ values = pointers[..] }
+    try testing.expect_equal(usize(3), argument_count(args))
+    if (argument(args, 0)) |value| {
+        first[0] = 'f'
+        try testing.expect(mem.eql(value, "fun"))
+    } else { try testing.expect(false) }
+    if (argument(args, 1)) |value| {
+        try testing.expect_equal(usize(0), value.len)
+    } else { try testing.expect(false) }
+    if (argument(args, 2)) |value| {
+        try testing.expect(mem.eql(value, "two words"))
+    } else { try testing.expect(false) }
+    try testing.expect(argument(args, 3) == null)
+    try testing.expect(argument(args, maxval!(usize)) == null)
+
+    none :: Args{ values = pointers[0..0] }
+    try testing.expect_equal(usize(0), argument_count(none))
+    try testing.expect(argument(none, 0) == null)
+}