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html.rs
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html.rs
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use fancy_regex::Regex;
use nu_cmd_base::formats::to::delimited::merge_descriptors;
use nu_engine::command_prelude::*;
use nu_protocol::{Config, DataSource, PipelineMetadata};
use nu_utils::IgnoreCaseExt;
use rust_embed::RustEmbed;
use serde::{Deserialize, Serialize};
use std::{collections::HashMap, error::Error, fmt::Write};
#[derive(Serialize, Deserialize, Debug)]
pub struct HtmlThemes {
themes: Vec<HtmlTheme>,
}
#[allow(non_snake_case)]
#[derive(Serialize, Deserialize, Debug)]
pub struct HtmlTheme {
name: String,
black: String,
red: String,
green: String,
yellow: String,
blue: String,
purple: String,
cyan: String,
white: String,
brightBlack: String,
brightRed: String,
brightGreen: String,
brightYellow: String,
brightBlue: String,
brightPurple: String,
brightCyan: String,
brightWhite: String,
background: String,
foreground: String,
}
impl Default for HtmlThemes {
fn default() -> Self {
HtmlThemes {
themes: vec![HtmlTheme::default()],
}
}
}
impl Default for HtmlTheme {
fn default() -> Self {
HtmlTheme {
name: "nu_default".to_string(),
black: "black".to_string(),
red: "red".to_string(),
green: "green".to_string(),
yellow: "#717100".to_string(),
blue: "blue".to_string(),
purple: "#c800c8".to_string(),
cyan: "#037979".to_string(),
white: "white".to_string(),
brightBlack: "black".to_string(),
brightRed: "red".to_string(),
brightGreen: "green".to_string(),
brightYellow: "#717100".to_string(),
brightBlue: "blue".to_string(),
brightPurple: "#c800c8".to_string(),
brightCyan: "#037979".to_string(),
brightWhite: "white".to_string(),
background: "white".to_string(),
foreground: "black".to_string(),
}
}
}
#[derive(RustEmbed)]
#[folder = "assets/"]
struct Assets;
#[derive(Clone)]
pub struct ToHtml;
impl Command for ToHtml {
fn name(&self) -> &str {
"to html"
}
fn signature(&self) -> Signature {
Signature::build("to html")
.input_output_types(vec![(Type::Nothing, Type::Any), (Type::Any, Type::String)])
.allow_variants_without_examples(true)
.switch("html-color", "change ansi colors to html colors", Some('c'))
.switch("no-color", "remove all ansi colors in output", Some('n'))
.switch(
"dark",
"indicate your background color is a darker color",
Some('d'),
)
.switch(
"partial",
"only output the html for the content itself",
Some('p'),
)
.named(
"theme",
SyntaxShape::String,
"the name of the theme to use (github, blulocolight, ...)",
Some('t'),
)
.switch(
"list",
"produce a color table of all available themes",
Some('l'),
)
.category(Category::Formats)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Outputs an HTML string representing the contents of this table",
example: "[[foo bar]; [1 2]] | to html",
result: Some(Value::test_string(
r#"<html><style>body { background-color:white;color:black; }</style><body><table><thead><tr><th>foo</th><th>bar</th></tr></thead><tbody><tr><td>1</td><td>2</td></tr></tbody></table></body></html>"#,
)),
},
Example {
description: "Optionally, only output the html for the content itself",
example: "[[foo bar]; [1 2]] | to html --partial",
result: Some(Value::test_string(
r#"<div style="background-color:white;color:black;"><table><thead><tr><th>foo</th><th>bar</th></tr></thead><tbody><tr><td>1</td><td>2</td></tr></tbody></table></div>"#,
)),
},
Example {
description: "Optionally, output the string with a dark background",
example: "[[foo bar]; [1 2]] | to html --dark",
result: Some(Value::test_string(
r#"<html><style>body { background-color:black;color:white; }</style><body><table><thead><tr><th>foo</th><th>bar</th></tr></thead><tbody><tr><td>1</td><td>2</td></tr></tbody></table></body></html>"#,
)),
},
]
}
fn usage(&self) -> &str {
"Convert table into simple HTML."
}
fn extra_usage(&self) -> &str {
"Screenshots of the themes can be browsed here: https://github.com/mbadolato/iTerm2-Color-Schemes."
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
to_html(input, call, engine_state, stack)
}
}
fn get_theme_from_asset_file(
is_dark: bool,
theme: Option<&Spanned<String>>,
) -> Result<HashMap<&'static str, String>, ShellError> {
let theme_name = match theme {
Some(s) => &s.item,
None => "default", // There is no theme named "default" so this will be HtmlTheme::default(), which is "nu_default".
};
// 228 themes come from
// https://github.com/mbadolato/iTerm2-Color-Schemes/tree/master/windowsterminal
// we should find a hit on any name in there
let asset = get_html_themes("228_themes.json").unwrap_or_default();
// Find the theme by theme name
let th = asset
.themes
.into_iter()
.find(|n| n.name.eq_ignore_case(theme_name)) // case insensitive search
.unwrap_or_default();
Ok(convert_html_theme_to_hash_map(is_dark, &th))
}
fn convert_html_theme_to_hash_map(
is_dark: bool,
theme: &HtmlTheme,
) -> HashMap<&'static str, String> {
let mut hm: HashMap<&str, String> = HashMap::with_capacity(18);
hm.insert("bold_black", theme.brightBlack[..].to_string());
hm.insert("bold_red", theme.brightRed[..].to_string());
hm.insert("bold_green", theme.brightGreen[..].to_string());
hm.insert("bold_yellow", theme.brightYellow[..].to_string());
hm.insert("bold_blue", theme.brightBlue[..].to_string());
hm.insert("bold_magenta", theme.brightPurple[..].to_string());
hm.insert("bold_cyan", theme.brightCyan[..].to_string());
hm.insert("bold_white", theme.brightWhite[..].to_string());
hm.insert("black", theme.black[..].to_string());
hm.insert("red", theme.red[..].to_string());
hm.insert("green", theme.green[..].to_string());
hm.insert("yellow", theme.yellow[..].to_string());
hm.insert("blue", theme.blue[..].to_string());
hm.insert("magenta", theme.purple[..].to_string());
hm.insert("cyan", theme.cyan[..].to_string());
hm.insert("white", theme.white[..].to_string());
// Try to make theme work with light or dark but
// flipping the foreground and background but leave
// the other colors the same.
if is_dark {
hm.insert("background", theme.black[..].to_string());
hm.insert("foreground", theme.white[..].to_string());
} else {
hm.insert("background", theme.white[..].to_string());
hm.insert("foreground", theme.black[..].to_string());
}
hm
}
fn get_html_themes(json_name: &str) -> Result<HtmlThemes, Box<dyn Error>> {
match Assets::get(json_name) {
Some(content) => Ok(nu_json::from_slice(&content.data)?),
None => Ok(HtmlThemes::default()),
}
}
fn to_html(
input: PipelineData,
call: &Call,
engine_state: &EngineState,
stack: &mut Stack,
) -> Result<PipelineData, ShellError> {
let head = call.head;
let html_color = call.has_flag(engine_state, stack, "html-color")?;
let no_color = call.has_flag(engine_state, stack, "no-color")?;
let dark = call.has_flag(engine_state, stack, "dark")?;
let partial = call.has_flag(engine_state, stack, "partial")?;
let list = call.has_flag(engine_state, stack, "list")?;
let theme: Option<Spanned<String>> = call.get_flag(engine_state, stack, "theme")?;
let config = engine_state.get_config();
let vec_of_values = input.into_iter().collect::<Vec<Value>>();
let headers = merge_descriptors(&vec_of_values);
let headers = Some(headers)
.filter(|headers| !headers.is_empty() && (headers.len() > 1 || !headers[0].is_empty()));
let mut output_string = String::new();
let mut regex_hm: HashMap<u32, (&str, String)> = HashMap::with_capacity(17);
if list {
// Being essentially a 'help' option, this can afford to be relatively unoptimised
return Ok(theme_demo(head));
}
let theme_span = match &theme {
Some(v) => v.span,
None => head,
};
let color_hm = get_theme_from_asset_file(dark, theme.as_ref());
let color_hm = match color_hm {
Ok(c) => c,
_ => {
return Err(ShellError::GenericError {
error: "Error finding theme name".into(),
msg: "Error finding theme name".into(),
span: Some(theme_span),
help: None,
inner: vec![],
})
}
};
// change the color of the page
if !partial {
write!(
&mut output_string,
r"<html><style>body {{ background-color:{};color:{}; }}</style><body>",
color_hm
.get("background")
.expect("Error getting background color"),
color_hm
.get("foreground")
.expect("Error getting foreground color")
)
.unwrap();
} else {
write!(
&mut output_string,
"<div style=\"background-color:{};color:{};\">",
color_hm
.get("background")
.expect("Error getting background color"),
color_hm
.get("foreground")
.expect("Error getting foreground color")
)
.unwrap();
}
let inner_value = match vec_of_values.len() {
0 => String::default(),
1 => match headers {
Some(headers) => html_table(vec_of_values, headers, config),
None => {
let value = &vec_of_values[0];
html_value(value.clone(), config)
}
},
_ => match headers {
Some(headers) => html_table(vec_of_values, headers, config),
None => html_list(vec_of_values, config),
},
};
output_string.push_str(&inner_value);
if !partial {
output_string.push_str("</body></html>");
} else {
output_string.push_str("</div>")
}
// Check to see if we want to remove all color or change ansi to html colors
if html_color {
setup_html_color_regexes(&mut regex_hm, &color_hm);
output_string = run_regexes(®ex_hm, &output_string);
} else if no_color {
setup_no_color_regexes(&mut regex_hm);
output_string = run_regexes(®ex_hm, &output_string);
}
Ok(Value::string(output_string, head).into_pipeline_data())
}
fn theme_demo(span: Span) -> PipelineData {
// If asset doesn't work, make sure to return the default theme
let html_themes = get_html_themes("228_themes.json").unwrap_or_default();
let result: Vec<Value> = html_themes
.themes
.into_iter()
.map(|n| {
Value::record(
record! {
"name" => Value::string(n.name, span),
"black" => Value::string(n.black, span),
"red" => Value::string(n.red, span),
"green" => Value::string(n.green, span),
"yellow" => Value::string(n.yellow, span),
"blue" => Value::string(n.blue, span),
"purple" => Value::string(n.purple, span),
"cyan" => Value::string(n.cyan, span),
"white" => Value::string(n.white, span),
"brightBlack" => Value::string(n.brightBlack, span),
"brightRed" => Value::string(n.brightRed, span),
"brightGreen" => Value::string(n.brightGreen, span),
"brightYellow" => Value::string(n.brightYellow, span),
"brightBlue" => Value::string(n.brightBlue, span),
"brightPurple" => Value::string(n.brightPurple, span),
"brightCyan" => Value::string(n.brightCyan, span),
"brightWhite" => Value::string(n.brightWhite, span),
"background" => Value::string(n.background, span),
"foreground" => Value::string(n.foreground, span),
},
span,
)
})
.collect();
Value::list(result, span).into_pipeline_data_with_metadata(PipelineMetadata {
data_source: DataSource::HtmlThemes,
})
}
fn html_list(list: Vec<Value>, config: &Config) -> String {
let mut output_string = String::new();
output_string.push_str("<ol>");
for value in list {
output_string.push_str("<li>");
output_string.push_str(&html_value(value, config));
output_string.push_str("</li>");
}
output_string.push_str("</ol>");
output_string
}
fn html_table(table: Vec<Value>, headers: Vec<String>, config: &Config) -> String {
let mut output_string = String::new();
output_string.push_str("<table>");
output_string.push_str("<thead><tr>");
for header in &headers {
output_string.push_str("<th>");
output_string.push_str(&v_htmlescape::escape(header).to_string());
output_string.push_str("</th>");
}
output_string.push_str("</tr></thead><tbody>");
for row in table {
let span = row.span();
if let Value::Record { val: row, .. } = row {
output_string.push_str("<tr>");
for header in &headers {
let data = row
.get(header)
.cloned()
.unwrap_or_else(|| Value::nothing(span));
output_string.push_str("<td>");
output_string.push_str(&html_value(data, config));
output_string.push_str("</td>");
}
output_string.push_str("</tr>");
}
}
output_string.push_str("</tbody></table>");
output_string
}
fn html_value(value: Value, config: &Config) -> String {
let mut output_string = String::new();
match value {
Value::Binary { val, .. } => {
let output = nu_pretty_hex::pretty_hex(&val);
output_string.push_str("<pre>");
output_string.push_str(&output);
output_string.push_str("</pre>");
}
other => output_string.push_str(
&v_htmlescape::escape(&other.to_abbreviated_string(config))
.to_string()
.replace('\n', "<br>"),
),
}
output_string
}
fn setup_html_color_regexes(
hash: &mut HashMap<u32, (&'static str, String)>,
color_hm: &HashMap<&str, String>,
) {
// All the bold colors
hash.insert(
0,
(
r"(?P<reset>\[0m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
// Reset the text color, normal weight font
format!(
r"<span style='color:{};font-weight:normal;'>$word</span>",
color_hm
.get("foreground")
.expect("Error getting reset text color")
),
),
);
hash.insert(
1,
(
// Bold Black
r"(?P<bb>\[1;30m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("foreground")
.expect("Error getting bold black text color")
),
),
);
hash.insert(
2,
(
// Bold Red
r"(?P<br>\[1;31m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("bold_red")
.expect("Error getting bold red text color"),
),
),
);
hash.insert(
3,
(
// Bold Green
r"(?P<bg>\[1;32m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("bold_green")
.expect("Error getting bold green text color"),
),
),
);
hash.insert(
4,
(
// Bold Yellow
r"(?P<by>\[1;33m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("bold_yellow")
.expect("Error getting bold yellow text color"),
),
),
);
hash.insert(
5,
(
// Bold Blue
r"(?P<bu>\[1;34m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("bold_blue")
.expect("Error getting bold blue text color"),
),
),
);
hash.insert(
6,
(
// Bold Magenta
r"(?P<bm>\[1;35m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("bold_magenta")
.expect("Error getting bold magenta text color"),
),
),
);
hash.insert(
7,
(
// Bold Cyan
r"(?P<bc>\[1;36m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("bold_cyan")
.expect("Error getting bold cyan text color"),
),
),
);
hash.insert(
8,
(
// Bold White
// Let's change this to black since the html background
// is white. White on white = no bueno.
r"(?P<bw>\[1;37m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};font-weight:bold;'>$word</span>",
color_hm
.get("foreground")
.expect("Error getting bold bold white text color"),
),
),
);
// All the normal colors
hash.insert(
9,
(
// Black
r"(?P<b>\[30m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm
.get("foreground")
.expect("Error getting black text color"),
),
),
);
hash.insert(
10,
(
// Red
r"(?P<r>\[31m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm.get("red").expect("Error getting red text color"),
),
),
);
hash.insert(
11,
(
// Green
r"(?P<g>\[32m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm
.get("green")
.expect("Error getting green text color"),
),
),
);
hash.insert(
12,
(
// Yellow
r"(?P<y>\[33m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm
.get("yellow")
.expect("Error getting yellow text color"),
),
),
);
hash.insert(
13,
(
// Blue
r"(?P<u>\[34m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm.get("blue").expect("Error getting blue text color"),
),
),
);
hash.insert(
14,
(
// Magenta
r"(?P<m>\[35m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm
.get("magenta")
.expect("Error getting magenta text color"),
),
),
);
hash.insert(
15,
(
// Cyan
r"(?P<c>\[36m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm.get("cyan").expect("Error getting cyan text color"),
),
),
);
hash.insert(
16,
(
// White
// Let's change this to black since the html background
// is white. White on white = no bueno.
r"(?P<w>\[37m)(?P<word>[[:alnum:][:space:][:punct:]]*)",
format!(
r"<span style='color:{};'>$word</span>",
color_hm
.get("foreground")
.expect("Error getting white text color"),
),
),
);
}
fn setup_no_color_regexes(hash: &mut HashMap<u32, (&'static str, String)>) {
// We can just use one regex here because we're just removing ansi sequences
// and not replacing them with html colors.
// attribution: https://stackoverflow.com/questions/14693701/how-can-i-remove-the-ansi-escape-sequences-from-a-string-in-python
hash.insert(
0,
(
r"(?:\x1B[@-Z\\-_]|[\x80-\x9A\x9C-\x9F]|(?:\x1B\[|\x9B)[0-?]*[ -/]*[@-~])",
r"$name_group_doesnt_exist".to_string(),
),
);
}
fn run_regexes(hash: &HashMap<u32, (&'static str, String)>, contents: &str) -> String {
let mut working_string = contents.to_owned();
let hash_count: u32 = hash.len() as u32;
for n in 0..hash_count {
let value = hash.get(&n).expect("error getting hash at index");
let re = Regex::new(value.0).expect("problem with color regex");
let after = re.replace_all(&working_string, &value.1[..]).to_string();
working_string = after;
}
working_string
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(ToHtml {})
}
}