Shen OS Kernel 32.0

Changed

• Integrated changes from the new S-kernel series.

Shen OS Kernel 31.0-rc1

Pre-release

Shen OS Kernel 22.4

Fixed

• Fixed compilation of empty vector pattern matching.

Shen OS Kernel 22.3

Added

• New experimental programmable-pattern-matching extension.
• Extensible selector rules on factorise-defun extension.
• Benchmarks.

Fixed

• Fixed bug in typechecking function that made user-defined typechecking rules for lambdas to never run.
• Fixed handling of prolog cuts in some corner cases.
• The t* algorithm now respects user-defined rules for lambdas.

Shen OS Kernel 22.2

Fixed

• factorise-defun extension: Avoid generating unnecessary labels for %%return expresions for literal values or variable references.

Shen OS Kernel 22.1

Added

• New factorise-defun extension that performs a pattern matching factorisation optimization on defuns.

Changed

• Split initialisation function into many.

Shen OS Kernel 22.0

Added

• Premature expansion of some dynamic code when generating .kl files so that it doesn't have to be evaluated during startup. Some ports should see a huge speedup in startup times from this change.
• Extensions (see doc/extensions.md).
• New document with instructions for porters on how to upgrade to new kernel releases (see doc/port-upgrade.md).

Changed

• shen.shen has been renamed to shen.repl.
• A new file init.kl has been added and it needs to be included along the other .kl files.
• A new shen.initialise function has been added. This function has to be called before anything else.
• Load order of .kl files doesn't matter anymore.

Shen OS Kernel 21.2

Fixed

• variables that shadow a pattern match variable no longer get ebr'd.
• print-vector? will now handle empty absvectors, returning false.
• Removed <> from initialisation of shen.external-symbols.
• Fix preclude* and include* not working for datatypes defined inside packages.

Changed

• tests.shen no longer resets pass/fail counters when test suite is finished.

Shen OS Kernel 21.1

Added

• Support for cons syntax in type signatures (via Mark).

Fixed

• Make prolog's call work with properly with pvars.

Changed

• prolog? macro now expands code inline like in SP instead of using defprolog (via Mark).
• (map F X) now returns (F X) when X is not a list. The type signature of map remains unchanged. Matches SP's behaviour.
• map is no longer tail-recursive. Matches SP's behaviour.

Shen OS Kernel 21.0

Added

• Moved code that prints errors at the toplevel to the shen.toplevel-display-exception function that can be overrided by ports to customize printing of errors (to for example, include error location).

Removed

• command-line function and *argv* variable.
• fold-right and fold-left.
• get/or, value/or, <-address/or, <-vector/or and <-dict/or.
• filter.
• exit.
• Handling of EOF in the REPL.

Changed

• for-each was made internal to the shen package.
• dict, dict?, dict-count, dict->, <-dict, dict-rm, dict-fold, dict-keys and dict-values made internal to the shen package.

Fixed

• Remove repetition from code generated by defcc which made some cases very slow to compile and run.
• Fixed the expansion of non-null packages generated by macros.
• Increased space allocated for prolog, fixes issues in bigger programs.
• Made , external.
• Fixes nth for cases where the element is not on the list or invalid arguments are passed.