# NAME

rpn - optex module for Reverse Polish Notation calculation

# SYNOPSIS

    optex -Mrpn command ...

# DESCRIPTION

**rpn** is a module for the **optex** command that detects arguments
that look like Reverse Polish Notation (RPN) expressions and replaces
them with their calculated results.

By default, all arguments are processed automatically when the module
is loaded.

# MODULE OPTIONS

Module options can be set via `-Mrpn::config(...)` or `--option`
before `--`.

- **--auto**, **--no-auto**

    Enable or disable automatic processing of all arguments.  Default is
    enabled.  Use `--no-auto` to disable and process only arguments
    specified by `--rpn`.

- **-p** _name\_or\_regex_, **--pattern** _name\_or\_regex_

    Specify a pattern to match RPN expressions.  The value can be either a
    preset name (word characters only, prefix match supported) or a
    custom regex pattern.

    When `--pattern` is specified, `--auto` is ignored.

    **Preset patterns:**

    - `rpn`

        Matches `rpn(...)` and extracts the content inside parentheses.

    - `equal`

        Matches `...=` at the end and extracts the expression before `=`.

    **Custom patterns:**

    When the value contains non-word characters, it is treated as a
    regex pattern.  The pattern must contain a capture group `(...)` that
    captures the RPN expression.  The entire matched portion is replaced
    with the calculated result.

    Examples:

        # Use preset pattern 'rpn' (or -pr for short)
        optex -Mrpn -pr -- echo '3600*5' '=' rpn(3600,5*)
        # outputs: 3600*5 = 18000

        # Use preset pattern 'equal' (or -pe for short)
        optex -Mrpn -pe -- echo '3600*5' '=' 3600,5*=
        # outputs: 3600*5 = 18000

        # Use custom regex pattern
        optex -Mrpn --pattern 'calc\[(.*)\]' -- echo calc[3600,5*]
        # outputs: 18000

- **--quiet**, **--no-quiet**

    Suppress Math::RPN warning messages.  Default is enabled.  Use
    `--no-quiet` to see warnings for invalid expressions.

- **--verbose**

    Print diagnostic messages.

# COMMAND OPTIONS

These options are available after `--`.

- **--rpn** _expression_

    Convert a single RPN expression.

        optex -Mrpn --no-auto -- printf '%s = %d\n' 3600,5* --rpn 3600,5*
        # outputs: 3600,5* = 18000

# EXPRESSIONS

An RPN expression requires at least two terms separated by commas or
colons.  A single term like `RAND` will not be converted, but
`RAND,0+` will produce a random number.

## OPERATORS

The following operators are supported (case-insensitive):

- Arithmetic

    `+` (ADD), `-` (SUB), `*` (MUL), `/` (DIV), `%` (MOD),
    `++` (INCR), `--` (DECR), `POW`, `SQRT`

- Trigonometric

    `SIN`, `COS`, `TAN`

- Logarithmic

    `LOG`, `EXP`

- Numeric

    `ABS`, `INT`

- Bitwise/Logical

    `&` (AND), `|` (OR), `!` (NOT), `XOR`, `~`

- Comparison

    `<` (LT), `<=` (LE), `=`/`==` (EQ),
    `>` (GT), `>=` (GE), `!=` (NE)

- Conditional

    `IF`

- Stack

    `DUP`, `EXCH`, `POP`

- Other

    `MIN`, `MAX`, `TIME`, `RAND`, `LRAND`

See [Math::RPN](https://metacpan.org/pod/Math%3A%3ARPN) for detailed descriptions of these operators.

# EXAMPLES

Convert 5 hours to seconds (3600 \* 5 = 18000):

    $ optex -Mrpn echo 3600,5*
    18000

Prevent macOS from sleeping for 5 hours:

    $ optex -Mrpn caffeinate -d -t 3600,5*

Process multiple expressions:

    $ optex -Mrpn echo 1,2+ 10,3*
    3 30

Generate a random number:

    $ optex -Mrpn echo RAND,0+
    0.316809834520431

# INSTALLATION

## CPANMINUS

    cpanm App::optex::rpn

# SEE ALSO

[App::optex](https://metacpan.org/pod/App%3A%3Aoptex), [https://github.com/kaz-utashiro/optex](https://github.com/kaz-utashiro/optex)

[App::optex::rpn](https://metacpan.org/pod/App%3A%3Aoptex%3A%3Arpn), [https://github.com/kaz-utashiro/optex-rpn](https://github.com/kaz-utashiro/optex-rpn)

[Math::RPN](https://metacpan.org/pod/Math%3A%3ARPN)

[https://qiita.com/kaz-utashiro/items/2df8c7fbd2fcb880cee6](https://qiita.com/kaz-utashiro/items/2df8c7fbd2fcb880cee6)

# AUTHOR

Kazumasa Utashiro

# LICENSE

Copyright 2021-2025 Kazumasa Utashiro.

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.