Trope Doc

Trope is a simple command line utility for merging various config file types and environmental variables into either YAML or JSON. It is a pure Rust implementation built for speed and as a showcase of Rust's ability to handle merging different types. It uses clap-rs for CLI interpretation, config-rs for file handling and serde for serialization.

Supported File Types

Trope supports the following file types as inputs:

• YAML
• JSON
• HJSON
• TOML
• INI

Installation

Usage

Once installed, using Trope is simple: trope [FLAGS] [OPTIONS]...
Typing trope -h provides an in-console listing of all the information listed here.

Features

Flags

• -h --help Displays inline help

• -V --version Displays current version

• -e --env Merges any environmental variables with the prefix 'TROPE'

• -d --debug When set, trope displays the merged configs instead of writing to file

  NOTE: --output must still be satisfied

Options

• -I --input Used to add merging candidates with syntax: PATH/FILENAME.extension each candidate separated by a space
• -O --output Defines or creates the desired output file with syntax: PATH/FILENAME.extension

Examples

Using three sample files: Settings.yaml, Server.toml and Johndoe.json listed below:

Settings.yaml

---
debug: false
port: 8080
host: 0.0.0.0
test-float: 3.4
test-int: 43
array:
  - One
  - two:
      a: 1
      b: 2
  - three

Server.toml

[servers]

  [servers.alpha]
  ip = "10.0.0.1"
  dc = "eqdc10"

  [servers.beta]
  ip = "10.0.0.2"
  dc = "eqdc10"
  country = "中国"

Johndoe.json

{
    "name": "John Doe",
    "age": 40,
    "address": {
      "street": "11 Castle Lane",
      "city": "London"
    },
    "phones": [
      "+44 1234567",
      "+44 2345678"
    ]
  }

Running trope -I Settings.yaml Server.toml Johndoe.json -O output.yaml from the working directory will return a file named output.yaml:

---
age: 40
"test-int": 43
address:
  street: 11 Castle Lane
  city: London
host: 0.0.0.0
phones:
  - +44 1234567
  - +44 2345678
name: John Doe
port: 8080
array:
  - One
  - two:
      b: 2
      a: 1
  - three
debug: false
servers:
  beta:
    dc: eqdc10
    ip: 10.0.0.2
    country: 中国
  alpha:
    ip: 10.0.0.1
    dc: eqdc10
"test-float": 3.4

Known Bugs

• Trope incorrectly handles -inf, +inf and NaN values. It handles these values in an unpredictable fashion and should be avoided if possible. This is as a result of the libraries used, and will correct as these libraries are updated.