dc

Rust clone of the Unix tool called dc.

From the man page of dc:

dc is a reverse-polish desk calculator which supports unlimited precision arithmetic. It also allows you to define and call macros. Normally dc reads from the standard input; if any command arguments are given to it, they are filenames, and dc reads and executes the contents of the files before reading from standard input. All normal output is to standard output; all error output is to standard error.

Full documentation of the dc program can be found here: https://www.gnu.org/software/bc/manual/dc-1.05/html_mono/dc.html

Building the application

$ git clone https://github.com/nagyf/dc.git
$ cd dc
$ cargo run

Examples

Execute a REPL (read-eval-print-loop) where you can type any valid command, and the program executes it:

$ cargo run
10 10 *p
100

Use the -e or --expression arguments to execute a script passed as string:

$ cargo run -- --expression="10 2 * 1 + 2 *p"
42

Use the -f or --file arguments to execute a file, or you can just pass the filename:

$ cargo run -- --file=test.dc
$ cargo run test.dc

Print the help:

$ cargo run -- --help
dc 0.1
Ferenc Nagy <nagy.ferenc.jr@protonmail.com>
Clone of the Unix program called dc

USAGE:
    dc [OPTIONS] [FILE]...

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -e, --expression <scriptexpression>    Add the commands in script to the set of commands to be run while processing
                                           the input.
    -f, --file <script-file>               Add the commands contained in the file script-file to the set of commands to
                                           be run while processing the input.

ARGS:
    <FILE>...    any files to process one-by-one

TODO

• Unlimited precision support (right now it works with 64bit floats)
• Register support
• String support
• Status Inquiry support