TTY is a toolbox for developing beautiful command line clients in Ruby. It provides a fluid interface for gathering input from the user, querying system and terminal and displaying information back. It is not another command line options parser, rather a plumbing library that helps in common tasks.
All too often libraries that interact with command line create their own interface logic that gathers input from users and displays information back. Many times utility files are created that contain methods for reading system or terminal properties. Shouldn't we focus our energy on building the actual client?
Even more so, any command line application needs a clear way of communicating its results back to terminal whether in tabular form, column form or colorfully indented text. Our time and energy should be spent in creating the tools not the foundation.
Jump-start development of your command line app:
- Terminal ASCII and Unicode tables. [status: ✔ ]
- Terminal output colorization. [status: ✔ ]
- Terminal output paging. [status: ✔ ]
- System detection utilities. [status: ✔ ]
- Command detection utilities. [status: ✔ ]
- Text manipulation(wrapping/truncation) [status: ✔ ]
- Terminal progress bars drawing. [status: ✔ ]
- Terminal spinners. [status: ✔ ]
- Prompt user interface. [status: In Progress]
- File diffs. [status: TODO]
- Configuration file management. [status: TODO]
- Logging [status: In Progress]
- Plugin ecosystem [status: TODO]
- Fully tested with major ruby interpreters.
Add this line to your application's Gemfile:
gem 'tty'
And then execute:
$ bundle
Or install it yourself as:
$ gem install tty
TTY provides you with many tools to get the job done in terminal.
To print tabular output use TTY::Table
:
table = TTY::Table[['a1', 'a2', 'a3'], ['b1', 'b2', 'b3']]
table.to_s # => a1 a2 a3
b1 b2 b3
To colorize your strings use Pastel
:
pastel = Pastel.new
pastel.green.on_red.bold('Piotr')
To create a progress bar use TTY::ProgressBar
:
bar = TTY::ProgressBar.new("downloading [:bar]", total: 30)
30.times { bar.advance }
To create a spinner use TTY::Spinner
:
spinner = TTY::Spinner.new('Loading ... ', format: :spin_2)
30.times { spinner.spin }
To instantiate table pass 2-dimensional array:
table = TTY::Table[['a1', 'a2'], ['b1', 'b2']]
table = TTY::Table.new [['a1', 'a2'], ['b1', 'b2']]
table = TTY::Table.new rows: [['a1', 'a2'], ['b1', 'b2']]
table = TTY::Table.new ['h1', 'h2'], [['a1', 'a2'], ['b1', 'b2']]
table = TTY::Table.new header: ['h1', 'h2'], rows: [['a1', 'a2'], ['b1', 'b2']]
or cross header with rows inside a hash like so
table = TTY::Table.new [{'h1' => ['a1', 'a2'], 'h2' => ['b1', 'b2']}]
Table behaves like an Array so <<
, each
and familiar methods can be used
table << ['a1', 'a2', 'a3']
table << ['b1', 'b2', 'b3']
table << ['a1', 'a2'] << ['b1', 'b2'] # chain rows assignment
table.each { |row| ... } # iterate over rows
table.each_with_index # iterate over each element with row and column index
table[i, j] # return element at row(i) and column(j)
table.row(i) { ... } # return array for row(i)
table.column(j) { ... } # return array for column(j)
table.column(name) # return array for column(name), name of header
table.row_size # return row size
table.column_size # return column size
table.size # return an array of [row_size, column_size]
table.border # specify border properties
or pass your rows in a block
table = TTY::Table.new do |t|
t << ['a1', 'a2', 'a3']
t << ['b1', 'b2', 'b3']
end
Once you have an instance of TTY::Table
you can print it out to the stdout like so:
table.to_s
a1 a2 a3
b1 b2 b3
This will use so called basic
renderer with default options.
However, you can include other customization options such as
border # hash of border properties out of :characters, :style, :separator keys
border_class # a type of border to use
column_widths # array of maximum columns widths
column_aligns # array of cell alignments out of :left, :center and :right, default :left
filter # a proc object that is applied to every field in a row
indent # indentation applied to rendered table
multiline # if true will wrap text at new line or column width,
# when false will escape special characters
orientation # either :horizontal or :vertical
padding # array of integers to set table fields padding
renderer # enforce display type out of :basic, :color, :unicode, :ascii
resize # if true will expand/shrink table column sizes to match the width,
# otherwise if false rotate table vertically
width # constrain the table total width, otherwise dynamically
# calculated from content and terminal size
Renderer options may include multiline
parameter. The true
value will cause the table fields wrap at their natural line breaks or in case when the column widths are set the content will wrap.
table = TTY::Table.new [ ["First", '1'], ["Multi\nLine\nContent", '2'], ["Third", '3']]
table.render :ascii, multiline: true
# =>
+-------+-+
|First |1|
|Multi |2|
|Line | |
|Content| |
|Third |3|
+-------+-+
When the false
option is specified all the special characters will be escaped and if the column widths are set the content will be truncated like so
table = TTY::Table.new [ ["First", '1'], ["Multiline\nContent", '2'], ["Third", '3']]
table.render :ascii, multiline: false
# =>
+------------------+-+
|First |1|
|Multiline\nContent|2|
|Third |3|
+------------------+-+
To print border around data table you need to specify renderer
type out of basic
, ascii
, unicode
. By default basic
is used. For instance, to output unicode border:
table = TTY::Table.new ['header1', 'header2'], [['a1', 'a2'], ['b1', 'b2']
table.render :unicode
# =>
┌───────┬───────┐
│header1│header2│
├───────┼───────┤
│a1 │a2 │
│b1 │b2 │
└───────┴───────┘
You can also create your own custom border by subclassing TTY::Table::Border
and implementing the def_border
method using internal DSL methods like so:
class MyBorder < TTY::Table::Border
def_border do
left '$'
center '$'
right '$'
bottom ' '
bottom_mid '*'
bottom_left '*'
bottom_right '*'
end
end
Next pass the border class to your table instance render_with
method
table = TTY::Table.new ['header1', 'header2'], [['a1', 'a2'], ['b1', 'b2']
table.render_with MyBorder
# =>
$header1$header2$
$a1 $a2 $
* * *
Finally, if you want to introduce slight modifications to the predefined border types, you can use table border
helper like so
table = TTY::Table.new ['header1', 'header2'], [['a1', 'a2'], ['b1', 'b2']
table.render do |renderer|
renderer.border do
mid '='
mid_mid ' '
end
end
# =>
header1 header2
======= =======
a1 a2
b1 b2
In addition to specifying border characters you can force table to render separator line on each row like:
table = TTY::Table.new ['header1', 'header2'], [['a1', 'a2'], ['b1', 'b2']]
table.render do |renderer|
renderer.border.separator = :each_row
end
# =>
+-------+-------+
|header1|header2|
+-------+-------+
|a1 |a2 |
+-------+-------+
|b1 |b2 |
+-------+-------+
Also to change the display color of your border do:
table.render do |renderer|
renderer.border.style = :red
end
All columns are left aligned by default. You can enforce per column alignment by passing column_aligns
option like so
rows = [['a1', 'a2'], ['b1', 'b2']
table = TTY::Table.new rows: rows
table.render column_aligns: [:center, :right]
To align a single column do
table.align_column(1, :right)
If you require a more granular alignment you can align individual fields in a row by passing align
option
table = TTY::Table.new do |t|
t << ['a1', 'a2', 'a3']
t << ['b1', {:value => 'b2', :align => :right}, 'b3']
t << ['c1', 'c2', {:value => 'c3', :align => :center}]
end
By default padding is not applied. You can add padding
to table fields like so
header = ['Field', 'Type', 'Null', 'Key', 'Default', 'Extra']
rows = [['id', 'int(11)', 'YES', 'nil', 'NULL', '']]
table = TTY::Table.new(header, rows)
table.render { |renderer| renderer.padding= [0,1,0,1] }
# =>
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id | int(11) | YES | nil | NULL | |
+-------+---------+------+-----+---------+-------+
or you can set specific padding using right
, left
, top
, bottom
helpers. However, when adding top or bottom padding a multiline
option needs to be set to true
to allow for rows to span multiple lines. For example
table.render { |renderer|
renderer.multiline = true
renderer.padding.top = 1
}
# =>
+-----+-------+----+---+-------+-----+
| | | | | | |
|Field|Type |Null|Key|Default|Extra|
+-----+-------+----+---+-------+-----+
| | | | | | |
|id |int(11)|YES |nil|NULL | |
+-----+-------+----+---+-------+-----+
You can define filters that will modify individual table fields value before they are rendered. A filter can be a callable such as proc. Here's an example that formats
table = TTY::Table.new ['header1', 'header2'], [['a1', 'a2'], ['b1', 'b2']
table.render do |renderer|
renderer.filter = Proc.new do |val, row_index, col_index|
if col_index == 1 and !(row_index == 0)
val.capitalize
else
val
end
end
end
# =>
+-------+-------+
|header1|header2|
+-------+-------+
|a1 |A2 |
+-------+-------+
|b1 |B2 |
+-------+-------+
To color even fields red on green background add filter like so
table.render do |renderer|
renderer.filter = proc do |val, row_index, col_index|
col_index % 2 == 1 ? TTY.color.set(val, :red, :on_green) : val
end
end
To control table's column sizes pass width
, resize
options. By default table's natural column widths are calculated from the content. If the total table width does not fit in terminal window then the table is rotated vertically to preserve content.
The resize
property will force the table to expand/shrink to match the terminal width or custom width
. On its own the width
property will not resize table but only enforce table vertical rotation if content overspills.
header = ['h1', 'h2', 'h3']
rows = [['aaa1', 'aa2', 'aaaaaaa3'], ['b1', 'b2', 'b3']]
table = TTY::Table.new header, rows
table.render width: 80, resize: true
# =>
+---------+-------+------------+
|h1 |h2 |h3 |
+---------+-------+------------+
|aaa1 |aa2 |aaaaaaa3 |
|b1 |b2 |b3 |
+---------+-------+------------+
To colorize your output you can use Pastel like so:
pastel = Pastel.new
pastel.red.on_green.bold 'text...' # => red bold text on green background
Please refer to documentation for complete API.
Please refer to documentation for complete API.
Please refer to documentation for complete API.
Please refer to documentation for complete API.
To read general terminal properties you can use on of the helpers
term = TTY::Terminal.new
term.echo(false) { } # switch off echo for the block
term.page # page terminal output, on non unix systems falls back to ruby implementation
To page your output do
term.page 'long text...'
Main responsibility is to interact with the prompt and provide convenience methods.
Available methods are
shell = TTY::Shell.new
shell.ask # print question
shell.read # read from stdin
shell.say # print message to stdout
shell.confirm # print message(s) in green
shell.warn # print message(s) in yellow
shell.error # print message(s) in red
shell.suggest # print suggestion message based on possible matches
shell.print_table # print table to stdout
In order to ask question and parse answers:
shell = TTY::Shell.new
answer = shell.ask("What is your name?").read_string
The library provides small DSL to help with parsing and asking precise questions
argument # :required or :optional
char # turn character based input, otherwise line (default: false)
clean # reset question
default # default value used if none is provided
echo # turn echo on and off (default: true)
mask # mask characters i.e '****' (default: false)
modify # apply answer modification :upcase, :downcase, :trim, :chomp etc..
range # specify range '0-9', '0..9', '0...9' or negative '-1..-9'
validate # regex against which stdin input is checked
valid # a list of expected valid options
You can chain question methods or configure them inside a block
shell.ask("What is your name?").argument(:required).default('Piotr').validate(/\w+\s\w+/).read_string
shell.ask "What is your name?" do
argument :required
default 'Piotr'
validate /\w+\s\w+/
valid ['Piotr', 'Piotrek']
modify :capitalize
end.read_string
Reading answers and converting them into required types can be done with custom readers
read_bool # return true or false for strings such as "Yes", "No"
read_char # return first character
read_date # return date type
read_datetime # return datetime type
read_email # validate answer against email regex
read_file # return a File object
read_float # return decimal or error if cannot convert
read_int # return integer or error if cannot convert
read_multiple # return multiple line string
read_password # return string with echo turned off
read_range # return range type
read_regex # return regex expression
read_string # return string
read_symbol # return symbol
read_text # return multiline string
For example, if we wanted to ask a user for a single digit in given range
ask("Provide number in range: 0-9") do
range '0-9'
on_error :retry
end.read_int
on the other hand, if we are interested in range answer then
ask("Provide range of numbers?").read_range
To suggest possible matches for the user input use suggest
method like so
shell.suggest('sta', ['stage', 'stash', 'commit', 'branch'])
# =>
Did you mean one of these?
stage
stash
TTY::System.unix? # check if unix platform
TTY::System.windows? # check if windows platform
TTY::System.which(cmd) # full path to executable if found, nil otherwise
TTY::System.exists?(cmd) # check if command is available
TTY::System.editor # provides access to system editor
To set preferred editor you can either use shell environment variables such as EDITOR
and VISUAL
or set the command(s) manually like so
TTY::System.editor.command('vim')
To open a file in your editor of choice do
TTY::System.editor.open('file path...')
- Fork it
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create new Pull Request
Copyright (c) 2012-2014 Piotr Murach. See LICENSE for further details.