treeprint [](https://godoc.org/github.com/xlab/treeprint) 
=========
Package `treeprint` provides a simple ASCII tree composing tool.
<a href="https://upload.wikimedia.org/wikipedia/commons/5/58/ENC_SYSTEME_FIGURE.jpeg"><img alt="SYSTEME FIGURE" src="https://upload.wikimedia.org/wikipedia/commons/thumb/5/58/ENC_SYSTEME_FIGURE.jpeg/896px-ENC_SYSTEME_FIGURE.jpeg" align="left" width="300"></a>
If you are familiar with the [tree](http://mama.indstate.edu/users/ice/tree/) utility that is a recursive directory listing command that produces a depth indented listing of files, then you have the idea of what it would look like.
On my system the command yields the following
```
$ tree
.
├── LICENSE
├── README.md
├── treeprint.go
└── treeprint_test.go
0 directories, 4 files
```
and I'd like to have the same format for my Go data structures when I print them.
## Installation
```
$ go get github.com/xlab/treeprint
```
## Concept of work
The general idea is that you initialise a new tree with `treeprint.New()` and then add nodes and
branches into it. Use `AddNode()` when you want add a node on the same level as the target or
use `AddBranch()` when you want to go a level deeper. So `tree.AddBranch().AddNode().AddNode()` would
create a new level with two distinct nodes on it. So `tree.AddNode().AddNode()` is a flat thing and
`tree.AddBranch().AddBranch().AddBranch()` is a high thing. Use `String()` or `Bytes()` on a branch
to render a subtree, or use it on the root to print the whole tree.
The utility will yield Unicode-friendly trees. The output is predictable and there is no platform-dependent exceptions, so if you have issues with displaying the tree in the console, all platform-related transformations can be done after the tree has been rendered: [an example](https://github.com/xlab/treeprint/issues/2#issuecomment-324944141) for Asian locales.
## Use cases
### When you want to render a complex data structure:
```go
func main() {
// to add a custom root name use `treeprint.NewWithRoot()` instead
tree := treeprint.New()
// create a new branch in the root
one := tree.AddBranch("one")
// add some nodes
one.AddNode("subnode1").AddNode("subnode2")
// create a new sub-branch
one.AddBranch("two").
AddNode("subnode1").AddNode("subnode2"). // add some nodes
AddBranch("three"). // add a new sub-branch
AddNode("subnode1").AddNode("subnode2") // add some nodes too
// add one more node that should surround the inner branch
one.AddNode("subnode3")
// add a new node to the root
tree.AddNode("outernode")
fmt.Println(tree.String())
}
```
Will give you:
```
.
├── one
│ ├── subnode1
│ ├── subnode2
│ ├── two
│ │ ├── subnode1
│ │ ├── subnode2
│ │ └── three
│ │ ├── subnode1
│ │ └── subnode2
│ └── subnode3
└── outernode
```
### Another case, when you have to make a tree where any leaf may have some meta-data (as `tree` is capable of it):
```go
func main {
// to add a custom root name use `treeprint.NewWithRoot()` instead
tree := treeprint.New()
tree.AddNode("Dockerfile")
tree.AddNode("Makefile")
tree.AddNode("aws.sh")
tree.AddMetaBranch(" 204", "bin").
AddNode("dbmaker").AddNode("someserver").AddNode("testtool")
tree.AddMetaBranch(" 374", "deploy").
AddNode("Makefile").AddNode("bootstrap.sh")
tree.AddMetaNode("122K", "testtool.a")
fmt.Println(tree.String())
}
```
Output:
```
.
├── Dockerfile
├── Makefile
├── aws.sh
├── [ 204] bin
│ ├── dbmaker
│ ├── someserver
│ └── testtool
├── [ 374] deploy
│ ├── Makefile
│ └── bootstrap.sh
└── [122K] testtool.a
```
### Iterating over the tree nodes
```go
tree := New()
one := tree.AddBranch("one")
one.AddNode("one-subnode1").AddNode("one-subnode2")
one.AddBranch("two").AddNode("two-subnode1").AddNode("two-subnode2").
AddBranch("three").AddNode("three-subnode1").AddNode("three-subnode2")
tree.AddNode("outernode")
// if you need to iterate over the whole tree
// call `VisitAll` from your top root node.
tree.VisitAll(func(item *node) {
if len(item.Nodes) > 0 {
// branch nodes
fmt.Println(item.Value) // will output one, two, three
} else {
// leaf nodes
fmt.Println(item.Value) // will output one-*, two-*, three-* and outernode
}
})
```
Yay! So it works.
## License
MIT
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