[Remind-Fans] Remind 05.00.00 is Released

[Dianne Skoll]

Hi, everyone,

I'm pleased to announce the release of Remind 05.00.00.  This release
features a complete rewrite of the expression-evaluation engine and a few
other improvements.

Remind 05.00.00 is available at https://dianne.skoll.ca/projects/remind/

Tar: https://dianne.skoll.ca/projects/remind/download/remind-05.00.00.tar.gz
GPG: https://dianne.skoll.ca/projects/remind/download/remind-05.00.00.tar.gz.sig
Git: https://git.skoll.ca/Skollsoft-Public/Remind

Complete release notes follow.

Regards,

Dianne.

CHANGES TO REMIND

* VERSION 5.0 Patch 0 - 2024-06-06

* MAJOR CHANGE: The expression evaluation engine has been completely replaced
  with a new one that splits parsing and evaluating into two separate steps.
  It also features short-circuit evaluation of &&, ||, iif() and choose().
  This should speed up expression-heavy reminder files.

  NOTE INCOMPATIBILITY: In expressions with side-effects, the short-circuit
  evaluation might change the result you get.  For example, consider
  running the following file through: remind file.rem 2024-06-04

    SET a trig("Mon +7") || trig("Thu +7")
    MSG trig = [trig()]

  Older Remind versions will output:

    trig = 2024-06-06

  whereas this version outputs:

    trig = 2024-06-10

  because the second part of the "||" expression is not evaluated.  The vast
  majority of Remind expressions do not have side-effects and should yield
  the same results as before.

  The newer expression engine also permits recursive functions, but
  these are not recommended.  Still, if you want to, you can do:

    fset factorial(n) iif(n <= 1, 1, n*factorial(n-1))

  and it will work for values of n that don't cause integer overflow.

* IMPROVEMENT: If there's an unmatched PUSH-OMIT-CONTEXT, print the
  filename and line number containing it.

* IMPROVEMENT: If there's an IF with a missing ENDIF, print the filename
  and line number of the IF statement.

* NEW FEATURE: Add EXPR OFF command to completely disable expression
  evaluation.  Useful if you INCLUDE files that you don't expect to
  contain expressions and may come from slightly untrustworthy sources.

* NEW FEATURE: Add $ExpressionTimeLimit system variable to enforce a
  maximum limit on how long evaluating an expression is allowed to take.

* NEW FEATURE: Add --max-execution-time=n command-line option to terminate
  Remind if it runs for more than n seconds.

* CHANGE: Make the command-line option "-ifoo" equivalent to "-ifoo=0"

* CHANGE: Permit a literal [ in a reminder by using the sequence [[
  The old ["["] still works.

* BUG FIX: In "purge" mode, Remind would sometimes purge reminders with
  a relative "SCANFROM" which haven't actually expired.  This has been fixed.

* BUG FIX: Disallow something like: FSET func(x, x) expr
  which shouldn't have been allowed in the first place.

* BUG FIX: Replace leading spaces with tabs in Makefiles (per Emanuele Torre
  and Tim Chase)

* VERSION 4.3 Patch 7 - 2024-04-29
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