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Changelog

0.8.1

Fixed

  • amiga_gfx fill / Flood TmpRas: Flood() requires a chip TmpRas on the draw RastPort. open_screen / open_window now AllocRaster + InitTmpRas and attach it; close/shutdown frees it before Window/Screen. fill uses Flood mode 1 and no-ops if TmpRas is missing (was mode 0 with NULL TmpRas → crash).
  • Amiga sibling imports: py68_set_script_dir kept volume/assign names without the trailing colon (PROGDIR → PROGDIR/myclass.py). It now preserves PROGDIR: / DH0: so import finds modules next to the script. Also, joining with script_dir/sys.path . no longer yields ./file.py (invalid on AmigaDOS); bare pythonami test1.py from the script drawer works.

Added

  • Amiga OS custom-screen graphics plugin: ext/amiga_gfx/amiga_gfx.py68k (OpenScreen / Workbench open_window / SetRGB4 / RastPort draw / blit / soft BOBs with optional background save/bob_draw restore / SimpleSprites / IDCMP keyboard+mouse / lowlevel joystick). Layer 2: lib/amiga_gfx.py. Docs: docs/amiga-os-gfx.md. Fixtures: test_amiga_gfx*, blit+sprites, WB window, BOB. Host --check smokes.
  • Amiga GUI installer foundation: examples/installer/ plus lib/install_*.py (install.ami / uninstall.ami, LHA extract via lha, User-Startup upsert, safe uninstall that opens ed S:User-Startup). Plugins: extended gui_intuition (progress + label/enable/redraw) and new ext/asl (ask_drawer). Doc: docs/amiga-gui-installer.md. Host check: examples/test_install_ami.py.
  • AmigaDOS runtime install scripts: scripts/Install now installs under SYS:Python68k and copies scripts/Uninstall. Uninstall removes the runtime, its lib drawer, and current-session Assign/Path entries; manually added S:User-Startup lines must still be removed by the user.

0.8.0

  • Language Level 0.8: classes and instances with single inheritance. class Name: / class Name(Base): at module level; restricted class body (pass, simple assignment, def); per-instance __dict__; __init__; bound user methods; isinstance / issubclass / object / type(obj).
  • Builtin exceptions are real type objects under BaseException / Exception. except Exception matches by single-inheritance subtype. Internal Py68ErrorKind tags remain for C raise paths and logging; user exception subclasses use catchable PY68_ERROR_EXCEPTION plus a type pointer (D-0049, D-0050).
  • __build_class__ builtin builds types from a namespace dict.
  • Multiple inheritance, metaclasses, descriptors, super(), operator dunders, nested classes, and closures remain out of scope.

0.7.2

  • Extension ABI (D-0048): Py68ExtServices on Py68Runtime lets LoadSeg plugins build owned str/list results without linking the interpreter.
  • New Amiga plugin ext/gui_intuition/gui_intuition.py68k — Layer 1 Intuition dialog API for guicreator-exported forms (make amiga-ext). Behavioral reference: HAS lib/gui_intuition.s; not linked from that object.
  • Pure-Python lib/gui_dialog.py Layer 2 helper (run_modal / run_modal_fields).
  • Owner Amiga fixture: tests/integration/amiga/test_gui_intuition.*.
  • Host unit test: tests/unit/test_ext_services.c.
  • gui_intuition close path matches HAS/RKM CloseWindowSafely (drain before ModifyIDCMP(0)); button/string borders match HAS bevels (GFLG_GADGHNONE, recessed edit frame with −2 inset) to fix close crashes and white/missing frames.

0.7.1

  • Module identity: direct scripts and -c commands expose __name__ as "__main__"; imported modules expose their canonical import name, including when accessed through an alias.
  • Version string Python68K 0.7.1.

0.7.0

  • Language Level 0.7: generators. yield in a module-level def makes the function a generator factory; calling it builds a PY68_OBJECT_GENERATOR and runs no body code. for, iter, and next resume generators, and an exhausted generator iterates as empty (D-0045). send, throw, close(), and yield from are not implemented.

  • Generator state lives in the generator object (locals, private operand stack sized once to maximum_stack, try stack, resume IP), so suspending never allocates and resuming never uses C recursion. Dropping the last reference frees locals and saved operands without running user finally blocks (D-0045).

  • New OP_YIELD_VALUE (0x3C) and Py68Code.is_generator; the verifier rejects OP_YIELD_VALUE outside a code object marked as a generator.

  • Generator expressions (elt for x in iterable if cond), including the unparenthesized form as a call's only argument (sum(x for x in range(5))); alongside another argument it is a syntax error, as in CPython. They compile to a synthetic nested generator code object; the outermost iterable is evaluated eagerly and free variables of an enclosing function are snapshotted as hidden arguments, so later rebinding is not observed (D-0046, a documented divergence from CPython closures).

  • list, tuple, set, sorted, sum, all, and any drain a generator argument into a list inside the VM before the native callback runs, so no builtin re-enters the interpreter (D-0047). min, max, len, and in do not accept generators.

  • A builtin called with the wrong number of arguments now raises a catchable TypeError naming the builtin and its accepted count; it previously failed with a blank Exception: line.

  • I/O failures report as OSError (Python 3); IOError remains an accepted alias for the same catchable kind (D-0044).

  • Restricted f-strings: f"...{expr}...{expr!r}...{expr:04d}..." with !s/!r/!a, literal format specs matching format(), and {{/}} escapes (D-0043). Nested f-strings, raw/bytes prefixes, and str.format methods remain deferred.

  • Builtins iter(x) / next(it[, default]) over the existing Py68Range cursor used by for; catchable StopIteration (D-0042). enumerate / reversed still deferred; for bytecode unchanged.

  • Builtin sum(iterable[, start]) for list/tuple of numbers; optional numeric start defaults to 0. Checked int overflow; float promotion matches + (D-0041).

  • Conditional expressions: then if condition else else (PY68_AST_IF_EXP). Evaluates the condition, then exactly one branch. Lower precedence than or/and/comparisons; else-chains are right-associative (a if c1 else b if c2 else c). Compiles to JUMP_IF_FALSE / JUMP (D-0040). Comprehension for/if clauses stay or_test filters. Statement if/elif/else is unchanged.

  • Fixed-count unpacking / multiple assignment: a, b = (1, 2), a, b = [1, 2], a, b = 1, 2, for a, b in pairs:, and string unpack a, b = "ab". OP_UNPACK (0x0F). Length mismatch is ValueError; non-sequence is TypeError. Assignment RHS is an expression list (D-0038). Starred and nested unpacking remain unsupported. D-0015 still requires parentheses for tuples outside assignment (return a, b is still a syntax error).

  • Identity operators is / is not (OP_IS / OP_IS_NOT). Immediate None/bool/int/float values compare by type and payload; heap objects compare by pointer (D-0037). is not is one comparison operator, not is plus unary not.

  • Membership operators in / not in (OP_CONTAINS / OP_NOT_CONTAINS) for str substring, list/tuple equality scan, dict keys, and set members.

  • for / comprehensions iterate strings as successive one-character strings.

  • Example examples/wordcount.py fixed for Level APIs (OSError, fread).

  • fread allocates from remaining file size (Seek/ftell), not the full count, so large “read all” counts work on Amiga without multi-GiB pre-allocation.

  • Amiga LoadSeg extensions: load_library(path) loads *.py68k plugins with a public export ABI (include/py68k_ext.h); sample ext/demo_add (vbcc C + vasm) via make amiga-ext (D-0027).

  • Version string Python68K 0.7.0.

0.6.0

  • Language Level 0.6: list, set, and dict comprehensions with nested for clauses and if filters. Targets bind in the enclosing function or module scope, matching for (D-0026). Generator expressions remain rejected.
  • Comprehension bytecode uses OP_LIST_APPEND / OP_SET_ADD / OP_MAP_ADD with existing RANGE_INIT/RANGE_NEXT loops; no nested functions.
  • Amiga: avoid calling ErrorOutput() on dos.library < V47 (fixes --debug / stderr Guru on Kickstart 2.x–3.1); use pr_CES or Output() instead.
  • String methods (ASCII/8-bit): case, search, trim, split/join, replace, align, expandtabs, translate, classifiers; bound via attr.c.
  • Text builtins: ord, chr, repr, ascii, all, any, format (minimal int specs), maketrans (returns dict). Literal escapes \\ \' \" \n \r \t \xHH decoded at load. See D-0024 / D-0025.
  • Version string Python68K 0.6.0.

0.5.0

  • Language Level 0.3: tuple, dict, set, limited attributes, bound methods, value equality/hash, IEEE-754 binary32 float, / true divide vs // floor divide.
  • Language Level 0.4: catchable exception objects, try/except/finally/raise, with fopen(...) as f.
  • Language Level 0.5: import / from / as, module objects, loader cache, builtin sys (path, modules, argv).
  • Targeted diagnostics for remaining unsupported keywords (class, lambda, …).
  • Version string Python68K 0.5.0.

0.2.0

  • File builtins: fopen/fclose/fread/freadline/fwrite/exists/remove/rename with modes r/w/a/rb/wb/ab (AmigaDOS Open on target; stdio on host).
  • Console input([prompt]) via stdin / AmigaDOS Input().
  • Host environment: getenv/setenv/unsetenv.
  • Amiga DOS assigns: assign_get/assign_add/assign_remove (AssignPath / AssignLock / Lock+NameFromLock).
  • PY68_OBJECT_FILE with close-on-release; host unit + language fixtures.
  • Version string Python68K 0.2.0.

0.1.0

  • Language Level 0.1 runtime: tokenize → parse → symbols → compile → verify → stack VM.
  • Scalars, arithmetic, comparisons, control flow, lists/strings, functions, builtins.
  • Host GCC build (make host) and Amiga vbcc build (make amiga).
  • Host unit tests and language fixture suite (make test).
  • Copyright preamble on all C/H sources: 2026 Piotr Rozentreter (Rozsoft).