go-pretty

README

go-pretty

Utilities to prettify console output of tables, lists, text, etc.

Table

Pretty-print tables into ASCII/Unicode strings.

• Add Rows one-by-one or as a group
• Add Header(s) and Footer(s)
• Auto Index Rows (1, 2, 3 ...) and Columns (A, B, C, ...)
• Limit the length of the Rows; limit the length of individual Columns
• Alignment - Horizontal & Vertical
  • Auto (horizontal) Align (numeric columns are aligned Right)
  • Custom (horizontal) Align per column
  • Custom (vertical) VAlign per column (and multi-line column support)
• Mirror output to an io.Writer object (like os.StdOut)
• Completely customizable styles
  • Many ready-to-use styles: table/style.go
  • Colorize Headers/Body/Footers using github.com/fatih/color
  • Custom text-case for Headers/Body/Footers
  • Enable separators between each row
  • Render table without a Border
• Render as:
  • (ASCII/Unicode) Table
  • CSV
  • HTML Table (with custom CSS Style)
  • Markdown Table

+-----+------------+-----------+--------+-----------------------------+
|   # | FIRST NAME | LAST NAME | SALARY |                             |
+-----+------------+-----------+--------+-----------------------------+
|   1 | Arya       | Stark     |   3000 |                             |
|  20 | Jon        | Snow      |   2000 | You know nothing, Jon Snow! |
| 300 | Tyrion     | Lannister |   5000 |                             |
+-----+------------+-----------+--------+-----------------------------+
|     |            | TOTAL     |  10000 |                             |
+-----+------------+-----------+--------+-----------------------------+

A demonstration of all the capabilities can be found here: cmd/demo-table

List

Pretty-print lists with multiple levels/indents into ASCII/Unicode strings.

• Append Items one-by-one or as a group
• Indent/UnIndent as you like
• Limit the length of the Lines/Items
• Support Items with Multiple-lines
• Mirror output to an io.Writer object (like os.StdOut)
• Completely customizable styles
  • Many ready-to-use styles: list/style.go
• Render as:
  • (ASCII/Unicode) List
  • HTML List (with custom CSS Class)
  • Markdown List

 ■ Game Of Thrones
   ■ Winter
   ■ Is
   ■ Coming
     ■ This
     ■ Is
     ■ Known
 ■ The Dark Tower
   ■ The Gunslinger

A demonstration of all the capabilities can be found here: cmd/demo-list

Text

The following features are all used by the other packages in this project. Specifically, table and list use these extensively:

• Align text horizontally
  • text/align.go
• Align text vertically
  • text/valign.go
• Colorize text using a simpler interface to github.com/fatih/color
  • text/color.go
• Format text (convert case for now)
  • text/format.go

The unit-tests for each of the above show how these are to be used.

Benchmarks

Partial output of make bench:

BenchmarkList_Render-8                   1000000              1607 ns/op             584 B/op         21 allocs/op
BenchmarkTable_Render-8                   100000             18828 ns/op            5009 B/op        190 allocs/op
BenchmarkTable_RenderCSV-8                300000              4066 ns/op            1920 B/op         44 allocs/op
BenchmarkTable_RenderHTML-8               300000              5621 ns/op            3377 B/op         43 allocs/op
BenchmarkTable_RenderMarkdown-8           300000              4221 ns/op            1856 B/op         42 allocs/op