136 lines
5.0 KiB
Plaintext
136 lines
5.0 KiB
Plaintext
= rpn_rs
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:!webfonts:
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:source-highlighter: rouge
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:rouge-style: molokai
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== Intro
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=== What is this?
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A TUI link:https://en.wikipedia.org/wiki/Reverse_Polish_notation[RPN] calculator, with inspiration taken from link:https://en.wikipedia.org/wiki/HP_calculators[HP RPN Calculators] and link:https://github.com/mawww/kakoune[Kakoune] that works like link:https://github.com/pelzlpj/orpie[Orpie].
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It uses link:https://github.com/fdehau/tui-rs[tui-rs] for the UI and link:https://serde.rs/[serde]+link:https://github.com/rust-cli/confy[confy] for configuration loading and saving.
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=== Comparison with existing tools
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* `orpie` (`ocaml`): has more features at the moment. Matrices, units, more default constants, etc, but I don't think it allows for custom macros
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* `dc` (`c`): allows for different input/output radix, no TUI and does not show the stack
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== Setup
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[source,sh,title='bash']
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----
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cargo install --git [this url]
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# Run it!
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~/.cargo/bin/rpn_rs
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# Or if "${HOME}/.cargo/bin" is in your PATH
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rpn_rs
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----
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=== Development setup
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[source,sh,title='bash']
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----
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git clone [this url]
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cargo build
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# For docs
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gem install --user-install rouge
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asciidoctor REAMDE.adoc
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----
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== Usage
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* `h`: Help menu - shows all keys
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* `@`: Show calculator settings like degree/radian, scientific/engineering/separated mode
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* `<ret> / <CR>`: Push number or Dup
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* `<ctrl+s>`: Save the configuration. On Linux this will be `~/.config/rpn_rs/rpn_rs.toml`
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* `<ctrl+l>`: Load the configuration. This runs by default when you start the calculator. Yes *I know* this should be redraw but not sure what else to use.
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* `m`: Show macro menu. Define custom macros in your config
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* `<tab>`: Show constants menu. Define constants in your config
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* `R`: Store bottom of stack in next char's register
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* `r`: Recall next char's register
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* `e`: When entering a number, applies `* 10^`
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=== Custom constants and macros
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If you have not done this before, open the calculator and press `<ctrl+s>` to save the basic config.
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Edit the config file (in Linux, edit `~/.config/rpn_rs/rpn_rs.toml` and add any constants or macros and press `<ctrl+l>` or reopen the calculator.
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Sample Macros:
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[toml, title='~/.config/rpn_rs/rpn_rs.toml']
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----
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# Push a, then b, then c, then mQ
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[macros.Q]
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macro = 'CalculatorMacro'
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help = 'Quadratic Formula'
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value = 'RcRbRarbnrb2^4rarc**-v+2ra*/rbnrb2^4rarc**-v-2ra*/'
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----
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Sample Constants (you can copy paste the ones you want into your config file):
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[toml, title='~/.config/rpn_rs/rpn_rs.toml']
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----
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[constants.E]
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macro = 'CalculatorConstant'
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help = 'Earth Mass (kg)'
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value = 5.972e24
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[constants.S]
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macro = 'CalculatorConstant'
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help = 'Sun Mass (kg)'
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value = 1.989e30
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[constants.a]
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macro = 'CalculatorConstant'
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help = '''Avogadro's Number (mol^-1)'''
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value = 6.022e23
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[constants.G]
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macro = 'CalculatorConstant'
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help = 'Gravitational Constant (Nm^2kg^-2)'
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value = 6.67e-11
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[constants.c]
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macro = 'CalculatorConstant'
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help = 'Speed of light (m/s)'
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value = 2.9979e8
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[constants.h]
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macro = 'CalculatorConstant'
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help = 'Planck constant (Js)'
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value = 6.626e-34
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----
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== Lore
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=== Why?
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. I am aware of no good terminal RPN calculators on linux. `dc` is neat but not fun to work with, `orpie` is written in ocaml (but really because Void Linux currently does not have a package in default repos for orpie).
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. I wanted to learn Rust. This seemed like a good first project that was actually useful, and the link:https://github.com/fdehau/tui-rs/blob/master/assets/demo.gif[GIF on tui-rs's homepage] make it look really cool.
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. I wanted to write or port an HP calculator emulator for terminal/linux, but they seem to all be written for Wandows and porting is hard. Also I would have to figure out how to convert a 131x80 pixel display to terminal.
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. I play Minecraft (FTB; PO3) and lots of recipes require exorbitant quantities of items. I wanted an RPN calculator that was programmable (most used recipe being x\64 x%64 to see how many stacks+remainder are required). I wrote this calculator with programability in mind.
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=== Inspiration?
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* link:https://github.com/mawww/kakoune[Kakoune] is my current editor. I like that the programming language *is* the user language. There is no command `line-down`. It's `j`. So when you script in it, you write commands as they are typed.
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* Similarly, link:https://en.wikipedia.org/wiki/HP_calculators[HP Calculators] work the same way. The language RPL is the language you use to calculate. Also RPN is really nice to use and you should use it if you don't.
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* link:https://github.com/pelzlpj/orpie[Orpie] was the calculator I used
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=== Missing features
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Will I implement these features? I don't know. Lots of these could be done by setting the base type to something complex and not `f64`. But no plans for that.
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* [ ] Pick (generally the up key): I will implement this
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* [ ] More accurate digits: I want to do this. `f64`s imprecision is ugly
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* Complex numbers: Not sure if I'll implement this
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* Matrices: Maybe
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* Units: This could be cool
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* Bases: Not yet
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* Different math operators like `!` or `sum`: If someone asks me to, I guess
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* Conditionals: If someone asks me to, I guess
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