init go module

12 files changed, 20 insertions, 717 deletions

diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index ea8c4bf..0000000
--- a/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-/target
diff --git a/Cargo.lock b/Cargo.lock
deleted file mode 100644
index 08d4da2..0000000
--- a/Cargo.lock
+++ /dev/null
@@ -1,281 +0,0 @@
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-# It is not intended for manual editing.
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- "winapi",
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- "smallvec",
- "windows-sys",
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- "crossterm",
- "tui",
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- "windows_x86_64_gnullvm",
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diff --git a/Cargo.toml b/Cargo.toml
deleted file mode 100644
index 8e064b7..0000000
--- a/Cargo.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[package]
-name = "pfc"
-version = "0.8.0"
-edition = "2021"
-
-[dependencies]
-tui = "0.19"
-crossterm = "0.25"
diff --git a/Makefile b/Makefile
index c6695e2..dd45c4c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,29 +1,21 @@
 include config.mk
 
 build:
-	cargo fmt --all
-	cargo test
-	cargo build
-
-run: build
-	target/debug/pfc
-
-doc:
-	cargo doc --open
+	go mod tidy
+	gofmt -l -s -w ./**/*.go
 
 clean:
-	rm -r target
+	rm -f pfc
 
-install:
-	cargo build --release
-	cp target/release/pfc ${DESTDIR}${PREFIX}/bin
+install: build
+	cp pfc ${DESTDIR}${PREFIX}/bin
 	chmod 755 ${DESTDIR}${PREFIX}/bin/pfc
 	mkdir -p ${DESTDIR}${MANPREFIX}/man1
 	sed "s/VERSION/${VERSION}/g" < pfc.1 > ${DESTDIR}${MANPREFIX}/man1/pfc.1
 	chmod 644 ${DESTDIR}${MANPREFIX}/man1/pfc.1
 
 uninstall:
-	rm -f ${DESTDIR}${PREFIX}/bin/pfc\
+	rm -f ${DESTDIR}${PREFIX}/bin/pfc \
 		${DESTDIR}${MANPREFIX}/man1/pfc.1
 
-.PHONY: build run doc clean install uninstall
+.PHONY: build install uninstall
diff --git a/README b/README
index b9f5060..4acd7ad 100644
--- a/README
+++ b/README
@@ -6,11 +6,7 @@ terminal.
 
 Requirements
 ------------
-Cargo, the Rust package manager, is required to build pfc.
-It can be installed from most Linux package managers or like so:
-
-	curl https://sh.rustup.rs -sSf | sh
-
+Go is required to build pfc.
 
 Installation
 ------------
diff --git a/cmd/pfc.go b/cmd/pfc.go
new file mode 100644
index 0000000..67821f5
--- /dev/null
+++ b/cmd/pfc.go
@@ -0,0 +1,9 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	fmt.Println("Hello, world")
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..84505d8
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.samanthony.xyz/pfc
+
+go 1.20
diff --git a/src/function.rs b/src/function.rs
deleted file mode 100644
index bb6462d..0000000
--- a/src/function.rs
+++ /dev/null
@@ -1,61 +0,0 @@
-use crate::AngleMode;
-
-pub enum Function {
-    Sin,  // Sine
-    Cos,  // Cosine
-    Tan,  // Tangent
-    Asin, // Inverse sine
-    Acos, // Inverse cosine
-    Atan, // Inverse tangent
-    Deg,  // Convert from radians to degrees
-    Rad,  // Convert from degrees to radians
-}
-
-impl Function {
-    pub fn parse(s: &str) -> Result<Self, ParseFunctionError> {
-        match s {
-            "sin" => Ok(Self::Sin),
-            "cos" => Ok(Self::Cos),
-            "tan" => Ok(Self::Tan),
-            "asin" => Ok(Self::Asin),
-            "acos" => Ok(Self::Acos),
-            "atan" => Ok(Self::Atan),
-            "deg" => Ok(Self::Deg),
-            "rad" => Ok(Self::Rad),
-            _ => Err(ParseFunctionError(s.to_string())),
-        }
-    }
-
-    pub fn call(&self, val: f64, angle_mode: AngleMode) -> f64 {
-        match self {
-            Self::Sin => match angle_mode {
-                AngleMode::Degrees => val.to_radians().sin(),
-                AngleMode::Radians => val.sin(),
-            },
-            Self::Cos => match angle_mode {
-                AngleMode::Degrees => val.to_radians().cos(),
-                AngleMode::Radians => val.cos(),
-            },
-            Self::Tan => match angle_mode {
-                AngleMode::Degrees => val.to_radians().tan(),
-                AngleMode::Radians => val.tan(),
-            },
-            Self::Asin => match angle_mode {
-                AngleMode::Degrees => val.asin().to_degrees(),
-                AngleMode::Radians => val.asin(),
-            },
-            Self::Acos => match angle_mode {
-                AngleMode::Degrees => val.acos().to_degrees(),
-                AngleMode::Radians => val.acos(),
-            },
-            Self::Atan => match angle_mode {
-                AngleMode::Degrees => val.atan().to_degrees(),
-                AngleMode::Radians => val.atan(),
-            },
-            Self::Deg => val.to_degrees(),
-            Self::Rad => val.to_radians(),
-        }
-    }
-}
-
-pub struct ParseFunctionError(String);
diff --git a/src/input.rs b/src/input.rs
deleted file mode 100644
index 2d982e5..0000000
--- a/src/input.rs
+++ /dev/null
@@ -1,94 +0,0 @@
-use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
-
-use crate::{Calculator, Constant, Function, Operator, Signal};
-
-impl Calculator {
-    pub fn handle_input(&mut self, key: KeyEvent) -> Signal {
-        match key.modifiers {
-            KeyModifiers::CONTROL => match key.code {
-                KeyCode::Char('c') => {
-                    return Signal::Exit;
-                }
-                _ => {}
-            },
-            KeyModifiers::SHIFT => match key.code {
-                KeyCode::Char('Q') => {
-                    return Signal::Exit;
-                }
-                KeyCode::Char('J' | 'K') => self.swap(),
-                KeyCode::Char('D') => {
-                    self.input_buffer = String::new();
-                }
-                KeyCode::Char('C') => self.clear(),
-                KeyCode::Char('A') => {
-                    self.angle_mode = self.angle_mode.toggle();
-                }
-                KeyCode::Char('N') => {
-                    if self.input_buffer.len() > 0 {
-                        if let Ok(f) = self.input_buffer.parse::<f64>() {
-                            self.input_buffer = format!("{}", -f);
-                        }
-                    } else if let Some(v) = self.stack.pop() {
-                        self.stack.push(-v);
-                    }
-                }
-                _ => {}
-            },
-            KeyModifiers::NONE => match key.code {
-                KeyCode::Char(c) => self.push_to_buffer(c),
-                KeyCode::Backspace => {
-                    self.input_buffer.pop();
-                }
-                KeyCode::Enter => {
-                    if let Ok(func) = Function::parse(&self.input_buffer) {
-                        if let Some(val) = self.stack.pop() {
-                            self.stack.push(func.call(val, self.angle_mode));
-                        }
-                    } else if let Ok(c) = Constant::parse(&self.input_buffer) {
-                        self.stack.push(c.value());
-                    } else if let Ok(bu) = self.input_buffer.parse::<f64>() {
-                        self.stack.push(bu);
-                    }
-                    self.input_buffer = String::new();
-                }
-                _ => {}
-            },
-            _ => {}
-        }
-        return Signal::None;
-    }
-
-    fn push_to_buffer(&mut self, c: char) {
-        if c == '.' && !self.input_buffer.contains('.') {
-            if self.input_buffer.len() == 0 {
-                self.input_buffer.push('0');
-            }
-            self.input_buffer.push(c);
-        } else if let Ok(op) = Operator::parse(c) {
-            if let Ok(c) = Constant::parse(&self.input_buffer) {
-                self.stack.push(c.value());
-            } else if let Ok(f) = self.input_buffer.parse::<f64>() {
-                self.stack.push(f);
-            }
-            self.input_buffer = String::new();
-            self.perform_operation(op);
-        } else {
-            self.input_buffer.push(c);
-        }
-    }
-
-    fn swap(&mut self) {
-        if let Some(st) = self.stack.pop() {
-            if let Ok(bu) = self.input_buffer.parse::<f64>() {
-                self.stack.push(bu);
-            }
-            self.input_buffer = format!("{}", st);
-        }
-    }
-
-    // Clear stack and input buffer.
-    fn clear(&mut self) {
-        self.input_buffer = String::new();
-        self.stack = Vec::new();
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
deleted file mode 100644
index db316f0..0000000
--- a/src/lib.rs
+++ /dev/null
@@ -1,122 +0,0 @@
-use std::{
-    f64::consts::{E, PI},
-    fmt::{self, Display, Formatter},
-};
-
-mod function;
-mod input;
-pub mod ui;
-
-pub use function::Function;
-
-#[derive(Default)]
-pub struct Calculator {
-    stack: Vec<f64>,
-    input_buffer: String,
-    angle_mode: AngleMode,
-}
-
-impl Calculator {
-    fn perform_operation(&mut self, op: Operator) {
-        let rhs = match self.stack.pop() {
-            Some(f) => f,
-            None => {
-                return;
-            }
-        };
-        let lhs = match self.stack.pop() {
-            Some(f) => f,
-            None => {
-                return;
-            }
-        };
-        self.stack.push(match op {
-            Operator::Add => lhs + rhs,
-            Operator::Sub => lhs - rhs,
-            Operator::Mul => lhs * rhs,
-            Operator::Div => lhs / rhs,
-            Operator::Exp => lhs.powf(rhs),
-        });
-    }
-}
-
-#[derive(Default, Copy, Clone, PartialEq)]
-pub enum AngleMode {
-    #[default]
-    Degrees,
-    Radians,
-}
-
-impl AngleMode {
-    fn toggle(&self) -> Self {
-        match self {
-            Self::Degrees => Self::Radians,
-            Self::Radians => Self::Degrees,
-        }
-    }
-}
-
-impl Display for AngleMode {
-    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
-        write!(
-            f,
-            "{}",
-            match self {
-                Self::Degrees => "deg",
-                Self::Radians => "rad",
-            }
-        )
-    }
-}
-
-enum Operator {
-    Add,
-    Sub,
-    Mul,
-    Div,
-    Exp,
-}
-
-impl Operator {
-    fn parse(c: char) -> Result<Self, ParseOperatorError> {
-        match c {
-            '+' => Ok(Self::Add),
-            '-' => Ok(Self::Sub),
-            '*' => Ok(Self::Mul),
-            '/' => Ok(Self::Div),
-            '^' => Ok(Self::Exp),
-            _ => Err(ParseOperatorError(c)),
-        }
-    }
-}
-
-struct ParseOperatorError(char);
-
-enum Constant {
-    Pi, // Archimedes’ constant (π)
-    E,  // Euler's number (e)
-}
-
-impl Constant {
-    fn parse(s: &str) -> Result<Self, ParseConstantError> {
-        match s {
-            "pi" => Ok(Self::Pi),
-            "e" => Ok(Self::E),
-            _ => Err(ParseConstantError(s.to_string())),
-        }
-    }
-
-    fn value(&self) -> f64 {
-        match self {
-            Self::Pi => PI,
-            Self::E => E,
-        }
-    }
-}
-
-struct ParseConstantError(String);
-
-pub enum Signal {
-    None,
-    Exit,
-}
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index 85e3888..0000000
--- a/src/main.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-use crossterm::event::{self, Event};
-use std::io;
-
-use pfc::{ui, Calculator, Signal};
-
-fn main() -> io::Result<()> {
-    let mut terminal = ui::init_terminal()?;
-    let mut calculator = Calculator::default();
-
-    let result = || -> io::Result<()> {
-        loop {
-            terminal.draw(|f| calculator.draw(f))?;
-
-            if let Event::Key(key) = event::read()? {
-                if let Signal::Exit = calculator.handle_input(key) {
-                    return Ok(());
-                }
-            }
-        }
-    }();
-
-    ui::cleanup_terminal(terminal)?;
-    result
-}
diff --git a/src/ui.rs b/src/ui.rs
deleted file mode 100644
index 76ecaf5..0000000
--- a/src/ui.rs
+++ /dev/null
@@ -1,106 +0,0 @@
-use crossterm::{
-    execute,
-    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
-};
-use std::io;
-use tui::{
-    backend::{Backend, CrosstermBackend},
-    layout::{Alignment, Constraint, Direction, Layout, Rect},
-    style::{Modifier, Style},
-    text::{Span, Spans},
-    widgets::{Block, Borders, List, ListItem, Paragraph, Widget},
-    Frame, Terminal,
-};
-
-use crate::{AngleMode, Calculator, Constant, Function};
-
-const WIDTH: u16 = 32;
-
-impl Calculator {
-    pub fn draw<B: Backend>(&self, f: &mut Frame<B>) {
-        let chunks = layout(self.stack.len(), f.size());
-        f.render_widget(version_number_widget(), chunks[0]);
-        f.render_widget(angle_mode_widget(self.angle_mode), chunks[2]);
-        f.render_widget(stack_widget(&self.stack), chunks[3]);
-        f.render_widget(input_buffer_widget(&self.input_buffer), chunks[4]);
-    }
-}
-
-pub fn init_terminal() -> Result<Terminal<CrosstermBackend<io::Stdout>>, io::Error> {
-    enable_raw_mode()?;
-    let mut stdout = io::stdout();
-    execute!(stdout, EnterAlternateScreen)?;
-    let backend = CrosstermBackend::new(stdout);
-    Terminal::new(backend)
-}
-
-pub fn cleanup_terminal<B>(mut terminal: Terminal<B>) -> Result<(), io::Error>
-where
-    B: Backend + io::Write,
-{
-    disable_raw_mode()?;
-    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
-    terminal.show_cursor()?;
-    Ok(())
-}
-
-fn layout(stack_size: usize, frame_size: Rect) -> Vec<Rect> {
-    let columns = Layout::default()
-        .direction(Direction::Horizontal)
-        .constraints([Constraint::Length(WIDTH), Constraint::Max(u16::MAX)].as_ref())
-        .split(frame_size);
-
-    Layout::default()
-        .direction(Direction::Vertical)
-        .constraints(
-            [
-                Constraint::Length(1),                     // Version number
-                Constraint::Max(u16::MAX),                 // Fill
-                Constraint::Length(1),                     // Angle mode
-                Constraint::Length(stack_size as u16 + 2), // Stack
-                Constraint::Length(3),                     // Input buffer
-            ]
-            .as_ref(),
-        )
-        .split(columns[0])
-}
-
-fn angle_mode_widget(angle_mode: AngleMode) -> impl Widget {
-    Paragraph::new(format!("{}", angle_mode)).alignment(Alignment::Right)
-}
-
-fn stack_widget(stack: &Vec<f64>) -> impl Widget {
-    List::new(
-        stack
-            .iter()
-            .map(|f| ListItem::new(format!("  {}", f)))
-            .collect::<Vec<ListItem>>(),
-    )
-    .block(Block::default().borders(Borders::ALL))
-}
-
-fn input_buffer_widget(input_buffer: &str) -> impl Widget {
-    Paragraph::new(Spans::from(vec![
-        Span::raw(">"),
-        Span::styled(
-            format!(" {}", input_buffer),
-            input_buffer_style(input_buffer),
-        ),
-    ]))
-    .block(Block::default().borders(Borders::ALL))
-}
-
-fn version_number_widget() -> impl Widget {
-    Paragraph::new(format!("pfc-{}", option_env!("CARGO_PKG_VERSION").unwrap()))
-        .alignment(Alignment::Center)
-}
-
-fn input_buffer_style(input_buffer: &str) -> Style {
-    if let Ok(_) = Function::parse(&input_buffer) {
-        Style::default().add_modifier(Modifier::BOLD)
-    } else if let Ok(_) = Constant::parse(&input_buffer) {
-        Style::default().add_modifier(Modifier::BOLD)
-    } else {
-        Style::default()
-    }
-}