Read the docs at docs.gomplate.ca, chat with developers and community in the #gomplate channel on Gophers Slack
gomplate is a template renderer which supports a growing list of datasources, such as: JSON (including EJSON - encrypted JSON), YAML, AWS EC2 metadata, BoltDB, Hashicorp Consul and Hashicorp Vault secrets.
Come chat with developers and community in the #gomplate channel on Gophers Slack and on GitHub Discussions!
Here are some hands-on examples of how gomplate works:
$ # at its most basic, gomplate can be used with environment variables...
$ echo 'Hello, {{ .Env.USER }}' | gomplate
Hello, hairyhenderson
$ # but that's kind of boring. gomplate has tons of functions to do useful stuff, too
$ gomplate -i 'the answer is: {{ mul 6 7 }}'
the answer is: 42
$ # and, since gomplate uses Go's templating syntax, you can do fun things like:
$ gomplate -i '{{ range seq 5 1 }}{{ . }} {{ if eq . 1 }}{{ "blastoff" | toUpper }}{{ end }}{{ end }}'
5 4 3 2 1 BLASTOFF
$ # the real fun comes when you use datasources!
$ cat ./config.yaml
foo:
bar:
baz: qux
$ gomplate -d config=./config.yaml -i 'the value we want is: {{ (datasource "config").foo.bar.baz }}'
the value we want is: qux
$ # datasources are defined by URLs, and gomplate is not limited to just file-based datasources:
$ gomplate -d ip=https://ipinfo.io -i 'country code: {{ (ds "ip").country }}'
country code: CA
$ # standard input can be used as a datasource too:
$ echo '{"cities":["London", "Johannesburg", "Windhoek"]}' | gomplate -d city=stdin:///in.json -i '{{ range (ds "city").cities }}{{.}}, {{end}}'
London, Johannesburg, Windhoek,
$ # and here's something a little more complicated:
$ export CITIES='city: [London, Johannesburg, Windhoek]'
$ cat in.tmpl
{{ range $i, $city := (ds "cities").city -}}
{{ add 1 $i }}: {{ include "weather" (print $city "?0") }}
{{ end }}
$ gomplate -d 'cities=env:///CITIES?type=application/yaml' -d 'weather=https://wttr.in/?0' -H 'weather=User-Agent: curl' -f in.tmpl
1: Weather report: London
\ / Partly cloudy
_ /"".-. 4-7 °C
\_( ). ↑ 20 km/h
/(___(__) 10 km
0.0 mm
2: Weather report: Johannesburg
\ / Partly cloudy
_ /"".-. 15 °C
\_( ). ↘ 0 km/h
/(___(__) 10 km
2.2 mm
3: Weather report: Windhoek
\ / Partly cloudy
_ /"".-. 20 °C
\_( ). ↑ 6 km/h
/(___(__) 20 km
0.0 mm
Read the documentation at docs.gomplate.ca, and join the discussion in GitHub Discussions!
Please report any bugs found in the issue tracker.
License
Copyright (c) 2016-2021 Dave Henderson
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