gviewer 3.0.6

General Viewer

# General Viewer (GViewer)
[](https://travis-ci.org/chhsiao90/gviewer)
[](https://coveralls.io/github/chhsiao90/gviewer?branch=master)

**Simple, Light Weight, Powerful**
GViewer is a terminal UI library that depends on [urwid](https://github.com/urwid/urwid) simplified writing a tui based reporting system.
You could write a powerful terminal UI that display and operate with data as you want with just less and less code.

## Installation
```shell
pip install gviewer
```

## Run Example
There are some example in examples that provide some use cases.
You could see and run the examples.

```shell
python examples/panama.py
```

## Usage

### Data Store

####StaticDataStore
Used for static data list, like log file
Initiate with a list of eny type of content
The content will transfer to the your defined displayer later for display

```python
from gviewer import StaticDataStore
data_store = StaticDataStore(data)
```

#### AsyncDataStore
Used for asynchronous data list, like subscribe an [zeromq](http://zeromq.org/) publisher

```python
def register_func(on_message):
some_listener.on_message(on_message)

data_store = AsyncDataStore(register_func)
```

### Displayer
Defined how you display your data from Data Store to summary/details

```python
from gviewer import BaseDisplayer, View, Group, PropsGroup, Text, Prop

class MyDisplayer(BaseDisplayer):
def to_summary(self, message):
"""
return a str or text markup
reference: http://urwid.org/manual/displayattributes.html#text-markup
"""
return message["summary"]

def get_views(self):
"""return an array of tuple that contains view title and a function that transform message to detail"""
return [
("view1", self.view1),
("view2", self.view2),
]

def view1(self, message):
"""return groups"""
return View(
[Group("title", [Text(m) for m in message["view1"]])]
)

def view2(self, message):
"""return groups"""
return View(
[PropsGroup("title", [Prop(p[0], p[1]) for p in message["view2"]])]
)
```

### GViewer
Main class to start the tui
The constructor accept any of urwid.MainLoop arguments to intiate with custom config

```python
from gviewer import GViewer, DisplayerContext
context = DisplayerContext(data_store, displayer)
viewer = GViewer(context)
viewer.start()
```

## Advanced Usage
### Summary Actions
Bind function to specific key to apply customize action, ex: export
```python
from gviewer import GViewer, DisplayerContext

def custom_export(controller, message, widget, *args, **kwargs):
with open("export", "w") as f:
f.write(str(message))
controller.notify("file is export")

context = DisplayerContext(data_store, displayer, actions=Actions([("a", "Custom export", custom_export)]))
viewer = GViewer(context)
```

### View Actions
Bind function to specific key to apply customize action, ex: export
```python
from gviewer import View, BaseDisplayer
class MyDisplayer(BaseDisplayer):
def get_views(self):
return [("view", self.view)]

def view(self, message):
return View([], actions=Actions([("a", "Custom export", self.custom_export)]))

def custom_export(controller, message, *args, **kwargs):
with open("export", "w") as f:
f.write(str(message))
controller.notify("file is export")
```

## Built-in actions
### Summary
- /: search
- g: top
- G: bottom
- x: clear current item
- X: clear all items
- q: quit
- ?: help

### Detail
- /: search
- tab: next view
- shift+tab: prev view
- n: search next result
- N: search previous result
- e: export current content to file
- q: quit
- ?: help


## Contribution
Please feel free to create issue or create PR