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changelog.md

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1.2 - xxxx-xx-xx

Changes affecting backwards compatibility

Breaking changes in the standard library

  • base64.encode no longer supports lineLen and newLine. Use base64.encodeMIME instead.
  • os.splitPath() behavior synchronized with os.splitFile() to return "/" as the dir component of "/root_sub_dir" instead of the empty string.
  • sequtils.zip now returns a sequence of anonymous tuples i.e. those tuples now do not have fields named "a" and "b".
  • strutils.formatFloat with precision = 0 has the same behavior in all backends, and it is compatible with Python's behavior, e.g. formatFloat(3.14159, precision = 0) is now 3, not 3..
  • Global variable lc has been removed from sugar.nim.

Breaking changes in the compiler

  • Implicit conversions for const behave correctly now, meaning that code like const SOMECONST = 0.int; procThatTakesInt32(SOMECONST) will be illegal now. Simply write const SOMECONST = 0 instead.

Library additions

  • macros.newLit now works for ref object types.

  • system.writeFile has been overloaded to also support openarray[byte].

  • Added overloaded strformat.fmt macro that use specified characters as delimiter instead of '{' and '}'.

  • introduced new procs in tables.nim: OrderedTable.pop, CountTable.del, CountTable.pop, Table.pop

  • Added sugar.outplace for turning in-place algorithms like sort and shuffle into operations that work on a copy of the data and return the mutated copy. As the existing sorted does.

  • Added sugar.collect that does comprehension for seq/set/table collections.

Library changes

  • asyncdispatch.drain now properly takes into account selector.hasPendingOperations and only returns once all pending async operations are guaranteed to have completed.
  • asyncdispatch.drain now consistently uses the passed timeout value for all iterations of the event loop, and not just the first iteration. This is more consistent with the other asyncdispatch apis, and allows asyncdispatch.drain to be more efficient.
  • base64.encode and base64.decode was made faster by about 50%.
  • htmlgen adds MathML support (ISO 40314).
  • macros.eqIdent is now invariant to export markers and backtick quotes.
  • htmlgen.html allows lang on the <html> tag and common valid attributes.

Language additions

  • An align pragma can now be used for variables and object fields, similar to the alignas declaration modifier in C/C++.

Language changes

  • Unsigned integer operators have been fixed to allow promotion of the first operand.
  • Conversions to unsigned integers are unchecked at runtime, imitating earlier Nim versions. The documentation was improved to acknowledge this special case. See nim-lang/RFCs#175 for more details.

Tool changes

Compiler changes

  • JS target indent is all spaces, instead of mixed spaces and tabs, for generated JavaScript.
  • The Nim compiler now supports the --asm command option for easier inspection of the produced assembler code.
  • The Nim compiler now supports a new pragma called .localPassc to pass specific compiler options to the C(++) backend for the C(++) file that was produced from the current Nim module.

Bugfixes

  • The FD variant of selector.unregister for ioselector_epoll and ioselector_select now properly handle the Event.User select event type.