node-plantuml-back

Folk from markushedvall's node-plantuml

A Node.js module and CLI for running PlantUML.

  

PlantUML is a popular diagramming tool that uses simple textual descriptions to draw UML diagrams. With the API provided by this module you can easily generate PlantUML diagrams directly from your Node.js application. It can also be used to encode and decode PlantUML source files.

This module also provides an easy to use and flexible command line interface for doing the same kind of operations as enabled by the API.

Install Graphviz to be able to generate all diagram types.

Install

``shell
npm install node-plantuml-back
`

If you want to use the CLI node-plantuml-back can be install it globally:

`shell
npm install node-plantuml-back -g
`

Example

Diagrams can be created from source files.

`javascript
var plantuml = require('node-plantuml-back');
var fs = require('fs');

var gen = plantuml.generate("input-file");
gen.out.pipe(fs.createWriteStream("output-file.png"));
`

If your application will be making multiple PlantUML requests, it might be a good idea to enable the usage of Nailgun.

Following is an example of a simple web server for generating images from encoded PlantUML source.

`javascript
var express = require('express');
var plantuml = require('node-plantuml-back');

var app = express();

plantuml.useNailgun(); // Activate the usage of Nailgun

app.get('/png/:uml', function(req, res) {
res.set('Content-Type', 'image/png');

var decode = plantuml.decode(req.params.uml);
var gen = plantuml.generate({format: 'png'});

decode.out.pipe(gen.in);
gen.out.pipe(res);
});

app.get('/svg/:uml', function(req, res) {
res.set('Content-Type', 'image/svg+xml');

var decode = plantuml.decode(req.params.uml);
var gen = plantuml.generate({format: 'svg'});

decode.out.pipe(gen.in);
gen.out.pipe(res);
});

app.listen(8080);
`

CLI

The node-plantuml-back CLI can be accessed with the puml command.

`shell
puml generate file.puml -o file.png
`

It's also possible to use stdin and stdout for input and output.

`shell
puml decode UDfpLD2rKt0200GS0Iy0 | puml generate > file.png
`

Simple textual one-liners can also be used as input.

`shell
puml generate --unicode --text "A -> B: Hello"
┌─┐ ┌─┐
│A│ │B│
└┬┘ └┬┘
│ Hello │
│───────────>│
┌┴┐ ┌┴┐
│A│ │B│
└─┘ └─┘
`

There are multiple options for input and for output. And the output can be in multiple different formats.

`text
Usage: puml [options] [command]


Commands:

generate [options] [file] Generate an UML diagram from PlantUML source
encode [options] [file] Encodes PlantUML source
decode Decodes PlantUML source
testdot Test the installation of Graphviz dot

Options:

-h, --help output usage information
-V, --version output the version number
`

`text
Usage: generate [options] [file]

Generate an UML diagram from PlantUML source

Options:

-h, --help output usage information
-p, --png ouput an UML diagram as a PNG image
-s, --svg ouput an UML diagram as an SVG image
-e, --eps ouput an UML diagram as an EPS image
-u, --unicode ouput an UML diagram in unicode text
-a, --ascii ouput an UML diagram in ASCII text
-o --output [file] the file in which to save the diagram
-c, --config [file] config file read before the diagram
-t, --text [text] UML text to generate from
-d, --dot [file] specify Graphviz dot executable
-i, --include [path] specify the path to include from
-C, --charset [charset] specify the charset of PlantUML source
`

`text
Usage: encode [options] [file]

Encodes PlantUML source

Options:

-h, --help output usage information
-t, --text [text] UML text to encode
`

`text
Usage: decode [options]

Decodes PlantUML source

Options:

-h, --help output usage information
``

Config templates

With predefined configuration templates the looks of the diagrams can be altered. For a more classic black and white look the classic configuration template can be used.
!alt tag

Compared to the standard PlantUML look:
!alt tag

License

MIT