tdio/envgod repository overview

echo 'Current Login User is {{.USER}}' | envgod
Current Login User is allex

# with envsubst
echo 'Hi {{.USER}}, CWD: $PWD' | envgod -env-subst
Hi allex, CWD: /Users/allex/Dev/go/envgod

# lower-case variable been reserved
export foo='foo'
echo 'Hi {{.USER}}, CWD: $PWD, $foo' | envgod -env-subst
Hi allex, CWD: /Users/allex/Dev/go/envgod, $foo

export FOO_CFG='{"foo":1,"bar":{"baz":[1,2,3,4,5]}}'
echo '{{- $config := jsonparse .FOO_CFG -}}{{- yamlencode $config -}}' | envgod

# output
---
bar:
  baz:
    - 1
    - 2
    - 3
    - 4
    - 5
foo: 1

cat <<'EOF' | envgod
{{- $config := jsonparse .CFG -}}
{{- range $k, $v := $config -}}
  {{ $k }}: {{ $v }}
{{ end -}}
EOF

# output
---
bar: map[baz:[1 2 3 4 5]]
foo: 1

export NGX_PORT=8080
export NGX_VALID_REFERERS="none server_names ~10.58.4 192.168.*"
export NGX_FOO_UPSTREAM="10.58.4.3:3000,10.58.4.5:3000"

cat <<-'EOR' | envgod -env-subst
# nginx.conf
upstream portal.srv {
{{- $servers := split .NGX_FOO_UPSTREAM "," -}}
{{ range $servers }}
  {{ if . }}server {{.}};{{- end -}}
{{ end }}
}

server {
  listen ${NGX_PORT:-8080};
  charset ${CHARSET:-UTF-8};
  server_tokens off;
  root $PWD; // root $${PWD}

  {{ if .NGX_VALID_REFERERS -}}
  valid_referers {{ .NGX_VALID_REFERERS }};
  if ($invalid_referer) {
    return 403;
  }
  {{- end }}

  location / {
    proxy_pass http://portal.srv
  }
}
EOR

# nginx.conf
upstream portal.srv {
  server 10.58.4.3:3000;
  server 10.58.4.5:3000;
}

server {
  listen 8080;
  charset UTF-8;
  server_tokens off;
  root /var/www/envgod; // root ${PWD}

  valid_referers none server_names ~10.58.4 192.168.*;
  if ($invalid_referer) {
    return 403;
  }

  location / {
    proxy_pass http://portal.srv
  }
}

{{$paths := split .PATH ":"}}
{{range $paths}}{{if .}}[{{.}}]{{end}}

{{ value | default "default value" }}

{{ value | trim }}

base64encode: {{ base64encode "test" }}
base64decode: {{ base64encode "hello" | base64decode }}

{{ $config := yamldecode "{ foo: 1, bar: { baz: [ 1,2,3,4] } }" -}}
---

{{ yamlencode $config }}

---

{{ yamlencode $ldcfg }}

{{ jsonstringify $ldcfg true | printf "# tojson\n%s" }}