m1gwings / Treedrawer
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treedrawer
treedrawer is a Go module for drawing trees on the terminal like the one below.
╭─╮
│9│
╰┬╯
╭─────────────────┴─────────────┬─────────────┬───┬───╮
╭──────────┴─────────╮ ╭┴╮ ╭┴╮ ╭┴╮ ╭┴╮
│I can handle strings│ │1│ │2│ │3│ │4│
╰──────────┬─────────╯ ╰┬╯ ╰─╯ ╰─╯ ╰─╯
│ ╭─────┬──┴─────╮
╭────────────────┴────────────────╮ ╭─┴─╮ ╭─┴╮ ╭────┴───╮
│with as many children as you want│ │124│ │13│ │a string│
╰────────────────┬────────────────╯ ╰───╯ ╰──╯ ╰────────╯
│
╭───────────────┴───────────────╮
│with as many layers as you want│
╰───────────────┬───────────────╯
│
╭─────────────────┴─────────────────╮
│actually I can handle everything...│
╰─────────────────┬─────────────────╯
│
╭──────────────────┴──────────────────╮
│...that satisfies NodeValue interface│
╰─────────────────────────────────────╯
Import
import "github.com/m1gwings/treedrawer/tree"
Quick start
# Assume the following code is in example.go file
$ cat example.go
package main
import (
"fmt"
"github.com/m1gwings/treedrawer/tree"
)
func main() {
// Creating a tree with 5 as the value of the root node
t := tree.NewTree(tree.NodeInt64(5))
// Adding children
t.AddChild(tree.NodeString("adding a string"))
t.AddChild(tree.NodeInt64(4))
t.AddChild(tree.NodeInt64(3))
// Drawing the tree
fmt.Println(t)
}
$ go run example.go
╭─╮
│5│
╰┬╯
╭───┴──────┬───╮
╭───────┴───────╮ ╭┴╮ ╭┴╮
│adding a string│ │4│ │3│
╰───────────────╯ ╰─╯ ╰─╯
Usage
Building the tree
Creating the tree with 1 as the value of the root node
t := tree.NewTree(tree.NodeInt64(1))
Adding the first child to t with value 2
t.AddChild(tree.NodeInt64(2))
Adding more children
t.AddChild(tree.NodeInt64(3))
t.AddChild(tree.NodeInt64(4))
t.AddChild(tree.NodeInt64(5))
We've just built the tree below
╭─╮
│1│
╰┬╯
╭───┬─┴─┬───╮
╭┴╮ ╭┴╮ ╭┴╮ ╭┴╮
│2│ │3│ │4│ │5│
╰─╯ ╰─╯ ╰─╯ ╰─╯
Navigating the tree
Navigating to first child of t (we're still working with the tree above)
// This method returns an error if the i-th child does not exist
// in this case i = 0
tFirstChild, err := t.Child(0)
Adding children to first child
tFirstChild.AddChild(tree.NodeInt64(6))
tFirstChild.AddChild(tree.NodeInt64(7))
tFirstChild.AddChild(tree.NodeInt64(8))
Going back to parent
// ok would be equal to false if tFirstChild were the root of the tree
tFirstChildParent, ok := tFirstChild.Parent()
_ := tFirstChildParent == t // true, we have gone back to the root of the tree
Navigating to third child of t
tThirdChild, err := t.Child(2)
Adding a string child to third child
tThirdChild.AddChild(tree.NodeString("I'm a string"))
Getting a pointer to the root of the tree
tRoot := tThirdChild.Root()
_ := tRoot == t // true
Now the tree looks like this
╭─╮
│1│
╰┬╯
╭───────┬───┴─────┬─────────╮
╭┴╮ ╭┴╮ ╭┴╮ ╭┴╮
│2│ │3│ │4│ │5│
╰┬╯ ╰─╯ ╰┬╯ ╰─╯
╭───┼───╮ │
╭┴╮ ╭┴╮ ╭┴╮ ╭──────┴─────╮
│6│ │7│ │8│ │I'm a string│
╰─╯ ╰─╯ ╰─╯ ╰────────────╯
Getting and setting values from the tree
Getting the value of a node
v := t.Val()
Setting the value of a node
t.SetVal(tree.NodeInt64(3))
Drawing the tree
*tree.Tree implements the Stringer interface, just use package fmt to draw trees to terminal
fmt.Println(t)
Implementing NodeValue interface
The tree can handle every type that satisfies the NodeValue interface
// NodeValue is the interface that wraps the Draw method.
//
// The Draw method allows to convert data into its unicode canvas representation.
// With the Draw method you can control how your data is going to appear on the tree.
type NodeValue interface {
Draw() *drawer.Drawer
}
The wrappers for built-in are defined inside the package treedrawer/tree like tree.NodeInt64 or tree.NodeString used above, so you don't need to worry about them.
Continue reading this section if you want to draw custom types instead.
- Importing treedrawer/drawer
First of all we need access to the drawer.Drawer type. Just import the following
import "github.com/m1gwings/treedrawer/drawer"
drawer.Drawer under the hood is just a 2D slice of runes on which you can draw a rune specifying its coordinates or another entire drawer.Drawer specifying the coordinates of its upper-left corner.
- Defining a custom type
type NodeAsterisk struct {
Width, Height int
}
NodeAsterisk represents a rectangle of width NodeAsterisk.Width and height NodeAsterisk.Height.
- Implementing NodeAsterisk.Draw() in order to satisfy NodeValue interface
func (nA NodeAsterisk) Draw() *drawer.Drawer {
d, err := drawer.NewDrawer(nA.Width, nA.Height)
if err != nil {
log.Fatal(err)
}
for x := 0; x < nA.Width; x++ {
for y := 0; y < nA.Height; y++ {
err = d.DrawRune('*', x, y)
if err != nil {
log.Fatal(err)
}
}
}
return d
}
The method allocates a new drawer with width nA.Width and height nA.Height, then loops over each cell and fills it with an '*'.
You can implement this method to represent your data as you want.
- Adding instances of NodeAsterisk to a tree
t := tree.NewTree(NodeAsterisk{3, 4})
t.AddChild(NodeAsterisk{1, 2})
t.AddChild(NodeAsterisk{3, 3})
- Drawing the tree
fmt.Println(t)
╭───╮
│***│
│***│
│***│
│***│
╰─┬─╯
╭──┴─╮
╭┴╮ ╭─┴─╮
│*│ │***│
│*│ │***│
╰─╯ │***│
╰───╯
Examples
You can find these examples inside the ./examples folder
HTML tree
# Assume the following code is in htmltree.go file
$ cat htmltree.go
package main
import (
"fmt"
"log"
"strings"
"github.com/m1gwings/treedrawer/tree"
"golang.org/x/net/html"
)
func main() {
s := `<p>Links:</p><ul><li><a href="foo">Foo</a><li><a href="/bar/baz">BarBaz</a></ul>`
doc, err := html.Parse(strings.NewReader(s))
if err != nil {
log.Fatal(err)
}
t := tree.NewTree(tree.NodeString(""))
var f func(*html.Node, *tree.Tree)
f = func(n *html.Node, t *tree.Tree) {
t.SetVal(tree.NodeString(n.Data))
for c := n.FirstChild; c != nil; c = c.NextSibling {
tChild := t.AddChild(tree.NodeString(""))
f(c, tChild)
}
}
// Starting from FirstChild because the DocumentRoot has an empty Val
f(doc.FirstChild, t)
fmt.Println(t)
}
$ go run htmltree.go
╭────╮
│html│
╰──┬─╯
╭────────────┴───╮
╭──┴─╮ ╭──┴─╮
│head│ │body│
╰────╯ ╰──┬─╯
╭───────┴────╮
╭┴╮ ╭─┴╮
│p│ │ul│
╰┬╯ ╰─┬╯
│ ╭────┴──╮
╭───┴──╮ ╭─┴╮ ╭─┴╮
│Links:│ │li│ │li│
╰──────╯ ╰─┬╯ ╰─┬╯
│ │
╭┴╮ ╭┴╮
│a│ │a│
╰┬╯ ╰┬╯
│ │
╭─┴─╮ ╭───┴──╮
│Foo│ │BarBaz│
╰───╯ ╰──────╯
File system tree
# Assume the following code is in filesystemtree.go file
$ cat filesystemtree.go
package main
import (
"fmt"
"log"
"strings"
"github.com/m1gwings/treedrawer/tree"
"golang.org/x/net/html"
)
func main() {
s := `<p>Links:</p><ul><li><a href="foo">Foo</a><li><a href="/bar/baz">BarBaz</a></ul>`
doc, err := html.Parse(strings.NewReader(s))
if err != nil {
log.Fatal(err)
}
t := tree.NewTree(tree.NodeString(""))
var f func(*html.Node, *tree.Tree)
f = func(n *html.Node, t *tree.Tree) {
t.SetVal(tree.NodeString(n.Data))
for c := n.FirstChild; c != nil; c = c.NextSibling {
tChild := t.AddChild(tree.NodeString(""))
f(c, tChild)
}
}
// Starting from FirstChild because the DocumentRoot has an empty Val
f(doc.FirstChild, t)
fmt.Println(t)
}
$ go run filesystemtree.go
╭──────────╮
│treedrawer│
╰─────┬────╯
╭──────────────────────┬─────────────────────┬───────────────────┬───────────────┴───┬───────────────────────────────────────────╮
╭────┴────╮ ╭────┴───╮ ╭───┴───╮ ╭───┴──╮ ╭───┴──╮ ╭──┴─╮
│README.md│ │examples│ │LICENSE│ │drawer│ │go.sum│ │tree│
╰─────────╯ ╰────┬───╯ ╰───────╯ ╰───┬──╯ ╰──────╯ ╰──┬─╯
╭─────────┴──────╮ ╭─────┴────────╮ ╭─────────────────┬──────────┴─┬────────────┬───────────────╮
╭─────┴─────╮ ╭────────┴────────╮ ╭───────┴──────╮ ╭────┴────╮ ╭────────┴───────╮ ╭──────┴─────╮ ╭───┴───╮ ╭──────┴──────╮ ╭──────┴─────╮
│htmltree.go│ │filesystemtree.go│ │drawer_test.go│ │drawer.go│ │examples_test.go│ │stringify.go│ │tree.go│ │nodevalues.go│ │tree_test.go│
╰───────────╯ ╰─────────────────╯ ╰──────────────╯ ╰─────────╯ ╰────────────────╯ ╰────────────╯ ╰───────╯ ╰─────────────╯ ╰────────────╯
Benchmarks
You can find the code used for the benchmark inside ./tree/stringify_test.go
In order to profile the module we first create trees with l layers and c children for each node, except leaf nodes. Each node has a tree.NodeString("*") as value.
For example the tree below has 3 layers and 2 children for each node.
╭─╮
│*│
╰┬╯
╭───┴───╮
╭┴╮ ╭┴╮
│*│ │*│
╰┬╯ ╰┬╯
╭─┴─╮ ╭─┴─╮
╭┴╮ ╭┴╮ ╭┴╮ ╭┴╮
│*│ │*│ │*│ │*│
╰─╯ ╰─╯ ╰─╯ ╰─╯
In our benchmark function we print to /dev/null a tree with the specified l and c parameter.
Name|Iterations|Time|Children per Node|Layers|Total of Nodes|Memory|Allocations
-|-|-|-|-|-|-|-|
BenchmarkDrawing3L3C-12|10000|100063 ns/op|3.00 children|3.00 layers|13.0 nodes|135576 B/op|722 allocs/op
BenchmarkDrawing100L1C-12|382|3096956 ns/op|1.00 children|100 layers|100 nodes|3727628 B/op|23297 allocs/op
BenchmarkDrawing6L3C-12|9|119789317 ns/op|3.00 children|6.00 layers|364 nodes|366549320 B/op|33606 allocs/op
BenchmarkDrawing1000L1C-12|7|161607620 ns/op|1.00 children|1000 layers|1000 nodes|373048737 B/op|2033004 allocs/op
BenchmarkDrawing10L2C-12|2|733952840 ns/op|2.00 children|10.0 layers|1023 nodes|4375790984 B/op|114909 allocs/op
BenchmarkDrawing11L2C-12|1|3661883138 ns/op|2.00 children|11.0 layers|2047 nodes|20557038432 B/op|249910 allocs/op
BenchmarkDrawing8L3C-12|1|8550947886 ns/op|3.00 children|8.00 layers|3280 nodes|50574173168 B/op|387828 allocs/op
BenchmarkDrawing12L2C-12|1|13559015034 ns/op|2.00 children|12.0 layers|4095 nodes|96166288000 B/op|538283 allocs/op
Generated using go version go1.15.1 linux/amd64
Known issues 🐛
- Emojis are larger than normal characters
fmt.Println(tree.NewTree(tree.NodeString("emojis are buggy 🤪")))
╭──────────────────╮
│emojis are buggy 🤪│
╰──────────────────╯