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|
use app::Config;
use decorations::{Decoration, GridBorderDecoration, LineChangesDecoration, LineNumberDecoration};
use diff::LineChanges;
use errors::*;
use std::boxed::Box;
use std::io::Write;
use std::vec::Vec;
use style::OutputWrap;
use syntect::highlighting;
use terminal::as_terminal_escaped;
use Colors;
pub struct Printer<'a> {
handle: &'a mut Write,
colors: Colors,
config: &'a Config<'a>,
decorations: Vec<Box<Decoration>>,
panel_width: usize,
pub line_changes: Option<LineChanges>,
}
impl<'a> Printer<'a> {
pub fn new(handle: &'a mut Write, config: &'a Config) -> Self {
let colors = if config.colored_output {
Colors::colored()
} else {
Colors::plain()
};
// Create decorations.
let mut decorations: Vec<Box<Decoration>> = Vec::new();
if config.output_components.numbers() {
decorations.push(Box::new(LineNumberDecoration::new(&colors)));
}
if config.output_components.changes() {
decorations.push(Box::new(LineChangesDecoration::new(&colors)));
}
let mut panel_width: usize =
decorations.len() + decorations.iter().fold(0, |a, x| a + x.width());
// The grid border decoration isn't added until after the panel_width calculation, since the
// print_horizontal_line, print_header, and print_footer functions all assume the panel
// width is without the grid border.
if config.output_components.grid() && decorations.len() > 0 {
decorations.push(Box::new(GridBorderDecoration::new(&colors)));
}
// Disable the panel if the terminal is too small (i.e. can't fit 5 characters with the
// panel showing).
if config.term_width
< (decorations.len() + decorations.iter().fold(0, |a, x| a + x.width())) + 5
{
decorations.clear();
panel_width = 0;
}
// Create printer.
Printer {
panel_width,
handle,
colors,
config,
decorations,
line_changes: None,
}
}
pub fn print_header(&mut self, filename: Option<&str>) -> Result<()> {
if !self.config.output_components.header() {
return Ok(());
}
if self.config.output_components.grid() {
self.print_horizontal_line('┬')?;
write!(
self.handle,
"{}{} ",
" ".repeat(self.panel_width),
self.colors
.grid
.paint(if self.panel_width > 0 { "│" } else { "" }),
)?;
}
writeln!(
self.handle,
"{}{}",
filename.map_or("", |_| "File: "),
self.colors.filename.paint(filename.unwrap_or("STDIN"))
)?;
if self.config.output_components.grid() {
self.print_horizontal_line('┼')?;
}
Ok(())
}
pub fn print_footer(&mut self) -> Result<()> {
if self.config.output_components.grid() {
self.print_horizontal_line('┴')
} else {
Ok(())
}
}
pub fn print_line(
&mut self,
line_number: usize,
regions: &[(highlighting::Style, &str)],
) -> Result<()> {
let mut cursor: usize = 0;
let mut cursor_max: usize = self.config.term_width;
let mut panel_wrap: Option<String> = None;
// Line decorations.
if self.panel_width > 0 {
let decorations = self
.decorations
.iter()
.map(|ref d| d.generate(line_number, false, self))
.collect::<Vec<_>>();
for deco in decorations {
write!(self.handle, "{} ", deco.text)?;
cursor_max -= deco.width + 1;
}
}
// Line contents.
if self.config.output_wrap == OutputWrap::None {
let true_color = self.config.true_color;
let colored_output = self.config.colored_output;
write!(
self.handle,
"{}",
regions
.iter()
.map(|&(style, text)| as_terminal_escaped(
style,
text,
true_color,
colored_output,
))
.collect::<Vec<_>>()
.join("")
)?;
} else {
for &(style, text) in regions.iter() {
let text = text.trim_right_matches(|c| c == '\r' || c == '\n');
let mut chars = text.chars();
let mut remaining = text.chars().count();
while remaining > 0 {
let available = cursor_max - cursor;
// It fits.
if remaining <= available {
let text = chars.by_ref().take(remaining).collect::<String>();
cursor += remaining;
write!(
self.handle,
"{}",
as_terminal_escaped(
style,
&*text,
self.config.true_color,
self.config.colored_output,
)
)?;
break;
}
// Generate wrap padding if not already generated.
if panel_wrap.is_none() {
panel_wrap = if self.panel_width > 0 {
Some(format!(
"{} ",
self.decorations
.iter()
.map(|ref d| d.generate(line_number, true, self).text)
.collect::<Vec<String>>()
.join(" ")
))
} else {
Some("".to_string())
}
}
// It wraps.
let text = chars.by_ref().take(available).collect::<String>();
cursor = 0;
remaining -= available;
write!(
self.handle,
"{}\n{}",
as_terminal_escaped(
style,
&*text,
self.config.true_color,
self.config.colored_output,
),
panel_wrap.clone().unwrap()
)?;
}
}
write!(self.handle, "\n")?;
}
Ok(())
}
fn print_horizontal_line(&mut self, grid_char: char) -> Result<()> {
if self.panel_width == 0 {
writeln!(
self.handle,
"{}",
self.colors.grid.paint("─".repeat(self.config.term_width))
)?;
} else {
let hline = "─".repeat(self.config.term_width - (self.panel_width + 1));
let hline = format!("{}{}{}", "─".repeat(self.panel_width), grid_char, hline);
writeln!(self.handle, "{}", self.colors.grid.paint(hline))?;
}
Ok(())
}
}
|
