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v1.8.x - yyyy-mm-dd

Changes affecting backward compatibility

  • std/sharedstrings module is removed.

  • Constants colors.colPaleVioletRed and colors.colMediumPurple changed to match the CSS color standard.

  • addr is now available for all addressable locations, unsafeAddr is deprecated and becomes an alias for addr.

Standard library additions and changes

  • macros.parseExpr and macros.parseStmt now accept an optional filename argument for more informative errors.

  • Module colors expanded with missing colors from the CSS color standard.

  • Fixed lists.SinglyLinkedList being broken after removing the last node (#19353).

  • std/smtp sends ehlo first. If the mail server does not understand, it sends helo as a fallback.

  • Added IsoWeekRange, a range type to represent the number of weeks in an ISO week-based year.

  • Added IsoYear, a distinct int type to prevent bugs from confusing the week-based year and the regular year.

  • Added initDateTime in times to create a datetime from a weekday, and ISO 8601 week number and week-based year.

  • Added getIsoWeekAndYear in times to get an ISO week number along with the corresponding ISO week-based year from a datetime.

  • Added getIsoWeeksInYear in times to return the number of weeks in an ISO week-based year.

  • Added std/oserrors for OS error reporting. Added std/envvars for environment variables handling.

  • Removed deprecated oids.oidToString.

  • Changed mimedb to use an OrderedTable instead of OrderedTableRef, to use it in a const.

  • Removed deprecated math.c_frexp.

Language changes

import macros

macro multiply(amount: static int, s: untyped): untyped =
  let name = $s[0].basename
  result = newNimNode(nnkTypeSection)
  for i in 1 .. amount:
    result.add(newTree(nnkTypeDef, ident(name & $i), s[1], s[2]))

type
  Foo = object
  Bar {.multiply: 3.} = object
    x, y, z: int
  Baz = object

# becomes

type
  Foo = object
  Bar1 = object
    x, y, z: int
  Bar2 = object
    x, y, z: int
  Bar3 = object
    x, y, z: int
  Baz = object
  • Case statement macros are no longer experimental, meaning you no longer need to enable the experimental switch caseStmtMacros to use them.

Compiler changes

  • nim can now compile version 1.4.0 as follows: nim c --lib:lib --stylecheck:off compiler/nim, without requiring -d:nimVersion140 which is now a noop.

Tool changes

  • Nim now supports Nimble version 0.14 which added support for lock-files. This is done by a simple configuration change setting that you can do yourself too. In $nim/config/nim.cfg replace pkgs by pkgs2.

  • There is a new switch --nimMainPrefix:prefix to influence the NimMain that the compiler produces. This is particularly useful for generating static libraries.

  • There is a new switch --depfile:path to write a GCC-style depfile that can be used with various build systems.