syringe

syringe is a lightweight template tool for infrastructure configuration.
It aims to create easy-to-read configuration template in short time.

Demo

syringe inserts the key/value to Go-Template file.
The key/value can be specified from the command line option, TOML, JSON, and environment variables.

Usage

syringe is a command-line application.

Usage is as follows,

$ syringe --help
Usage:
  syringe [options] <template> [<backend>...]

Application Options:
  -b, --backend=     Backend type (default: toml) [$SY_BACKEND]
      --debug        Enable debug logging [$SY_DEBUG]
      --delim-left=  Template start delimiter (default: {{) [$SY_DELIML]
      --delim-right= Template end delimiter (default: }}) [$SY_DELIMR]
  -h, --help         Show this help
  -v, --variable=    Set key/values (format key:value)
      --version      Show version information

Insert the value to the template file specified by <template>.

The value can be defined by -v, --variable flag and <backend> file.
-v, --variable flag and <backend> file can be specified multiple times.

+-------------------------+      +-----------+         +------------+
| 1. Stdin from pipe      |----->|           |         |            |
+-------------------------+      |           |         |            |
                                 |           |         |            |
+-------------------------+      |           | Insert  |   Golang   | Merged string  +----------+
| 2. <backend> or Env var |----->| Key/Value |-------->|  Template  |--------------->|  Stdout  |
+-------------------------+      |   Table   |         | <template> |                +----------+
                                 |           |         |            |
+-------------------------+      |           |         |            |
| 3. -v, --variable flag  |----->|           |         |            |
+-------------------------+      +-----------+         +------------+

<backend> type can be specified by -b, --backend flag.
You can specify the type of following.

• env
• json
• toml (default)

Go-Template delimiter is {{ and }} by default.
If you want to change the delimiter, please specify --delim-left and --delim-right flag.

Template functions

The function of the following, you can call in the template.

exec

Run the external command and insert the results to the template.

This configuration was generated at {{exec "date +%Y-%m-%d"}}

Output:

This configuration was generated at 2016-05-02

toNetwork

Convert the IP address to Network address.
You can specify either the prefix length and subnet mask.

{{toNetwork "192.168.1.1" "255.255.255.0"}}

Output:

192.168.1.0

toPrefixLen

Convert the Subnet mask to Prefix length.

{{toPrefixLen "255.255.255.0"}}

Output:

24

toSubnetMask

Convert the Prefix length to Subnet mask.

{{toSubnetMask "24"}}

Output:

255.255.255.0

Install

Installing syringe is way too easy. It have no external dependencies.

Please download from RELEASE PAGE.

Contribution

1. Fork (https://github.com/tanksuzuki/syringe/fork)
2. Create a feature branch
3. Commit your changes and run go fmt ./...
4. Rebase your local changes against the master branch
5. Run test suite with the go test ./... command and confirm that it passes
6. Create new Pull Request

License

syringe is licensed under the Apache License, Version 2.0.
See LICENSE for the full license text.

Author

Asuka Suzuki