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<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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// Copyright 2019 Gerrit Viljoen
// This file is part of ascii-table.
//
// ascii-table is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ascii-table is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ascii-table. If not, see <http://www.gnu.org/licenses/>.
use std::collections::HashMap;
#[derive(Clone, Debug)]
pub struct TableConfig {
pub width: u32,
pub columns: HashMap<usize, ColumnConfig>
}
impl Default for TableConfig {
fn default() -> Self {
TableConfig {
width: 80,
columns: HashMap::new()
}
}
}
#[derive(Clone, Debug, Default)]
pub struct ColumnConfig {
pub header: String,
pub align: Align
}
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
pub enum Align {
Right,
Center,
Left
}
impl Default for Align {
fn default() -> Self {
Align::Left
}
}

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src/lib.rs
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#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
// Copyright 2019 Gerrit Viljoen
// This file is part of ascii-table.
//
// ascii-table is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ascii-table is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ascii-table. If not, see <http://www.gnu.org/licenses/>.
mod config;
pub use config::*;
#[cfg(test)] mod test;
use std::fmt::Display;
const SE: &str = "┌";
const NW: &str = "┘";
const SW: &str = "┐";
const NS: &str = "│";
const NE: &str = "└";
const EWS: &str = "┬";
const NES: &str = "├";
const NWS: &str = "┤";
const NEW: &str = "┴";
const NEWS: &str = "┼";
const EW: &str = "─";
pub fn print_table<L1, L2, T>(data: L1, conf: &TableConfig)
where L1: IntoIterator<Item = L2>,
L2: IntoIterator<Item = T>,
T: Display {
print!("{}", format_table(data, conf))
}
pub fn format_table<L1, L2, T>(data: L1, conf: &TableConfig) -> String
where L1: IntoIterator<Item = L2>,
L2: IntoIterator<Item = T>,
T: Display {
format_table_inner(stringify(data), conf)
}
fn format_table_inner(data: Vec<Vec<String>>, conf: &TableConfig) -> String {
if !valid(&data, conf) {
return format_empty()
}
let num_cols = data.iter().map(|x| x.len()).max().unwrap();
let data = square_data(data, num_cols);
let col_conf = resolve_column_config(conf, num_cols);
let header = col_conf.iter().any(|x| x.header.chars().count() > 0);
let widths = column_widths(&data, conf, &col_conf);
let mut result = String::new();
result.push_str(&format_first(&widths));
if header {
let x: Vec<String> = col_conf.iter().map(|x| x.header.clone()).collect();
result.push_str(&format_row2(&x, &widths));
result.push_str(&format_middle(&widths));
}
for row in data {
result.push_str(&format_row(&row, &col_conf, &widths));
}
result.push_str(&format_last(&widths));
result
}
fn valid(data: &Vec<Vec<String>>, conf: &TableConfig) -> bool {
if data.len() == 0 {
false
} else if conf.width < 4 {
false
} else if data.iter().map(|x| x.len()).max().unwrap_or(0) == 0 {
false
} else {
true
}
}
fn stringify<L1, L2, T>(data: L1) -> Vec<Vec<String>>
where L1: IntoIterator<Item = L2>,
L2: IntoIterator<Item = T>,
T: Display {
data.into_iter().map(|row| row.into_iter().map(|cell| cell.to_string()).collect()).collect()
}
fn square_data(mut data: Vec<Vec<String>>, num_cols: usize) -> Vec<Vec<String>> {
for row in data.iter_mut() {
while row.len() < num_cols {
row.push(String::new())
}
}
data
}
fn resolve_column_config(conf: &TableConfig, num_cols: usize) -> Vec<ColumnConfig> {
(0..num_cols).map(|x| match conf.columns.get(&x) {
Some(x) => x.clone(),
None => ColumnConfig::default()
}).collect()
}
fn column_widths(data: &Vec<Vec<String>>, conf: &TableConfig, col_conf: &Vec<ColumnConfig>) -> Vec<u32> {
let header_widths = col_conf.iter().map(|x| x.header.chars().count());
let data_widths = (0..col_conf.len()).map(|a|
data.iter().map(|row|
if a < row.len() {row[a].chars().count()} else {0}
).max().unwrap_or(0)
);
let result = header_widths.zip(data_widths).map(|(x, y)| x.max(y) as u32).collect();
trunc(result, conf)
}
fn trunc(mut widths: Vec<u32>, conf: &TableConfig) -> Vec<u32> {
let max_width = conf.width;
while widths.iter().sum::<u32>() + ((widths.len() as u32 - 1) * 3) + 4 > max_width {
let idx;
{
let max = widths.iter().max().unwrap();
idx = widths.iter().rposition(|x| x == max).unwrap();
}
widths[idx] = widths[idx] - 1;
}
widths
}
fn format_line(row: &Vec<String>, head: &str, delim: &str, tail: &str) -> String {
let mut result = String::new();
result.push_str(head);
for cell in row {
result.push_str(&format!("{}{}", cell, delim));
}
for _ in 0..delim.chars().count() {
result.pop();
}
result.push_str(tail);
result.push('\n');
result
}
fn format_empty() -> String {
format_first(&vec![0])
+ &format_line(&vec![String::new()], &format!("{}{}", NS, ' '), &format!("{}{}{}", ' ', NS, ' '), &format!("{}{}", ' ', NS))
+ &format_last(&vec![0])
}
fn format_first(widths: &Vec<u32>) -> String {
let row: Vec<String> = widths.iter().map(|x| EW.repeat(*x as usize)).collect();
format_line(&row, &format!("{}{}", SE, EW), &format!("{}{}{}", EW, EWS, EW), &format!("{}{}", EW, SW))
}
fn format_middle(widths: &Vec<u32>) -> String {
let row: Vec<String> = widths.iter().map(|x| EW.repeat(*x as usize)).collect();
format_line(&row, &format!("{}{}", NES, EW), &format!("{}{}{}", EW, NEWS, EW), &format!("{}{}", EW, NWS))
}
fn format_row(row: &Vec<String>, col_conf: &Vec<ColumnConfig>, widths: &Vec<u32>) -> String {
let row: Vec<String> = row.iter().zip(widths.iter()).zip(col_conf.iter()).map(|((cell, width), conf)|
make_cell(&cell, *width as usize, ' ', &conf.align)
).collect();
format_line(&row, &format!("{}{}", NS, ' '), &format!("{}{}{}", ' ', NS, ' '), &format!("{}{}", ' ', NS))
}
fn format_row2(row: &Vec<String>, widths: &Vec<u32>) -> String {
let row: Vec<String> = row.iter().zip(widths.iter()).map(|(cell, width)|
make_cell(&cell, *width as usize, ' ', &Align::Left)
).collect();
format_line(&row, &format!("{}{}", NS, ' '), &format!("{}{}{}", ' ', NS, ' '), &format!("{}{}", ' ', NS))
}
fn format_last(widths: &Vec<u32>) -> String {
let row: Vec<String> = widths.iter().map(|x| EW.repeat(*x as usize)).collect();
format_line(&row, &format!("{}{}", NE, EW), &format!("{}{}{}", EW, NEW, EW), &format!("{}{}", EW, NW))
}
fn make_cell(text: &str, len: usize, pad: char, align: &Align) -> String {
if text.chars().count() > len {
let mut result: String = text.chars().take(len).collect();
if let Some(_) = result.pop() {result.push('+')};
result
} else {
let mut result = text.to_string();
match align {
Align::Left => while result.chars().count() < len {
result.push(pad)
}
Align::Right => while result.chars().count() < len {
result.insert(0, pad)
}
Align::Center => while result.chars().count() < len {
result.push(pad);
if result.chars().count() < len {
result.insert(0, pad)
}
}
}
result
}
}

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// Copyright 2019 Gerrit Viljoen
// This file is part of ascii-table.
//
// ascii-table is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ascii-table is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ascii-table. If not, see <http://www.gnu.org/licenses/>.
use super::*;
fn cube_config() -> TableConfig {
let mut result = TableConfig::default();
result.columns.insert(0, ColumnConfig::default());
result.columns.insert(1, ColumnConfig::default());
result.columns.insert(2, ColumnConfig::default());
if let Some(x) = result.columns.get_mut(&0) {x.header = String::from("a")}
if let Some(x) = result.columns.get_mut(&1) {x.header = String::from("b")}
if let Some(x) = result.columns.get_mut(&2) {x.header = String::from("c")}
result
}
fn default_config() -> TableConfig {
TableConfig::default()
}
#[test]
fn empty1() {
let config = default_config();
let input: Vec<Vec<i32>> = vec![];
let expected = "┌──┐\n\
│ │\n\
└──┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn empty2() {
let config = default_config();
let input: Vec<Vec<i32>> = vec![vec![]];
let expected = "┌──┐\n\
│ │\n\
└──┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn cube() {
let config = cube_config();
let input = vec![&[1, 2, 3], &[4, 5, 6], &[7, 8, 9]];
let expected = "┌───┬───┬───┐\n\
│ a │ b │ c │\n\
├───┼───┼───┤\n\
│ 1 │ 2 │ 3 │\n\
│ 4 │ 5 │ 6 │\n\
│ 7 │ 8 │ 9 │\n\
└───┴───┴───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn cube_no_header() {
let config = default_config();
let input = vec![&[1, 2, 3], &[4, 5, 6], &[7, 8, 9]];
let expected = "┌───┬───┬───┐\n\
│ 1 │ 2 │ 3 │\n\
│ 4 │ 5 │ 6 │\n\
│ 7 │ 8 │ 9 │\n\
└───┴───┴───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn one_cell() {
let config = default_config();
let input = vec![&[1]];
let expected = "┌───┐\n\
│ 1 │\n\
└───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn mini_empty() {
let config = TableConfig {
width: 4,
..default_config()
};
let input = vec![&[123]];
let expected = "┌──┐\n\
│ │\n\
└──┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn mini_zero_char() {
let config = TableConfig {
width: 5,
..default_config()
};
let input = vec![&[123]];
let expected = "┌───┐\n\
│ + │\n\
└───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn mini_one_char() {
let config = TableConfig {
width: 6,
..default_config()
};
let input = vec![&[123]];
let expected = "┌────┐\n\
│ 1+ │\n\
└────┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn partial_cube1() {
let config = cube_config();
let input: Vec<&[i32]> = vec![&[1, 2, 3], &[4, 5], &[7]];
let expected = "┌───┬───┬───┐\n\
│ a │ b │ c │\n\
├───┼───┼───┤\n\
│ 1 │ 2 │ 3 │\n\
│ 4 │ 5 │ │\n\
│ 7 │ │ │\n\
└───┴───┴───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn partial_cube2() {
let config = cube_config();
let input: Vec<&[i32]> = vec![&[1], &[4, 5], &[7, 8, 9]];
let expected = "┌───┬───┬───┐\n\
│ a │ b │ c │\n\
├───┼───┼───┤\n\
│ 1 │ │ │\n\
│ 4 │ 5 │ │\n\
│ 7 │ 8 │ 9 │\n\
└───┴───┴───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn resize_col1() {
let config = cube_config();
let input = vec![&[1], &[23], &[456]];
let expected = "┌─────┐\n\
│ a │\n\
├─────┤\n\
│ 1 │\n\
│ 23 │\n\
│ 456 │\n\
└─────┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn resize_col2() {
let config = cube_config();
let input = vec![&[123], &[45], &[6]];
let expected = "┌─────┐\n\
│ a │\n\
├─────┤\n\
│ 123 │\n\
│ 45 │\n\
│ 6 │\n\
└─────┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn partial_head1() {
let config = cube_config();
let input = vec![&[1, 2, 3, 0], &[4, 5, 6, 0], &[7, 8, 9, 0]];
let expected = "┌───┬───┬───┬───┐\n\
│ a │ b │ c │ │\n\
├───┼───┼───┼───┤\n\
│ 1 │ 2 │ 3 │ 0 │\n\
│ 4 │ 5 │ 6 │ 0 │\n\
│ 7 │ 8 │ 9 │ 0 │\n\
└───┴───┴───┴───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn partial_head2() {
let mut config = TableConfig::default();
config.columns.insert(2, ColumnConfig {header: String::from("c"), ..ColumnConfig::default()});
let input = vec![&[1, 2, 3], &[4, 5, 6], &[7, 8, 9]];
let expected = "┌───┬───┬───┐\n\
│ │ │ c │\n\
├───┼───┼───┤\n\
│ 1 │ 2 │ 3 │\n\
│ 4 │ 5 │ 6 │\n\
│ 7 │ 8 │ 9 │\n\
└───┴───┴───┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn align_right() {
let mut config = TableConfig::default();
config.columns.insert(0, ColumnConfig {header: String::from("a"), align: Align::Right});
let input = vec![&[1], &[23], &[456]];
let expected = "┌─────┐\n\
│ a │\n\
├─────┤\n\
│ 1 │\n\
│ 23 │\n\
│ 456 │\n\
└─────┘\n";
assert_eq!(expected, format_table(input, &config));
}
#[test]
fn align_center() {
let mut config = TableConfig::default();
config.columns.insert(0, ColumnConfig {header: String::from("a"), align: Align::Center});
let input = vec![&[1], &[23], &[456], &[7890], &[12345]];
let expected = "┌───────┐\n\
│ a │\n\
├───────┤\n\
│ 1 │\n\
│ 23 │\n\
│ 456 │\n\
│ 7890 │\n\
│ 12345 │\n\
└───────┘\n";
assert_eq!(expected, format_table(input, &config));
}