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dc improved - Expanded rewrite of a classic RPN calculator / esoteric programming language

This readme only mentions changes compared to GNU dc. If you're unfamiliar with its core principles, read its man page or the Wikipedia article.

Complete documentation in the wiki

Building

(Assuming complete and up-to-date build environment)

In general

cargo install --git https://github.com/43615/dcim

Windows

gmp-mpfr-sys requires some extra setup. Follow the instructions here, under "Building on Windows". After building it in MinGW once, new dc:im versions can be built normally until I update it to a new version of gmp-mpfr-sys.

Note: Numbers with huge mantissae (W≥2³⁰) cause crashes for some arcane internal reason I can't control. If you want to calculate something to a billion digits, use WSL.

Android (Termux)

• Pray to a deity of your choosing
• Sacrifice this envar and 3 lambs at 13:37 on a Sunday while looking north-northeast: export RUSTFLAGS=" -C link-arg=$(clang -print-libgcc-file-name)"

Most important changes compared to GNU dc

• Expanded shell argument syntax, run dcim -h to learn more.
• Default (interactive/shell) mode now has a prompt indicator.
• Error messages are much more helpful and differentiated, and are always prefixed with !.
• When type/semantic errors occur, all used objects are returned to the stack.
• Numbers are binary floats with user-changeable precision (W). The parameter K only applies to output.
• Strings have full Unicode support (stored in UTF-8).
• Several new arithmetic and string manipulation commands.
• Niladic (non-popping) printing commands print brackets around strings for clarity.
• Commands that need integers round numbers towards zero (discarding the fractional part).
• Number input/output bases are unlimited upwards, bases above 36 use a custom "any-base" notation.
• The amount of registers provided is now unlimited.
• Arbitrary registers can be selected with a "register pointer" command.
• Nonexistent register array objects are initialized with empty strings.
• A library of various named constants and unit conversion factors.

Using dc:im in your code (WIP)

• Create a state storage struct (State::default).
  • Non-trivial defaults can be customized with corresponding .custom_* methods.
• Execute commands with exec.
• Example: rust let mut s = dcim::State::default() .custom_w(1_000_000_000); dcim::exec(&mut s, "[pi]\"p".into()); //calculate π to 1 billion bits, print