Templating ssh_config with gomplate

command

jq -s '.' hosts/* | gomplate -f ssh_config.tmpl -d server=stdin:///in.json > ~/.ssh/config.inc

group1.json

{
  "name": "neo",
  "ips": ["10.1.0.1"],
  "key": "ed25519",
  "comment": "NAS",
  "env": {
    "TERM": "xterm-ghostty"
  },
  "proxy": [
    ["home", "none"]
  ]
}
{
  "name": "jarvis",
  "ips": ["192.168.0.1"],
  "user": "mohshami",
  "key": "ed25519",
  "proxy": [
    ["home", "none"]
  ]
}

ssh_config.tmpl

AddKeysToAgent yes
{{ range (ds "server") }}
{{ if ne (index . "comment") nil }}# {{ .comment }}{{ end }}
{{- $item := . -}}
{{ range (index . "proxy" | default (slice (dict "none" "none"))) }}
Match host {{ $item.name }},{{ join ($item.ips | default slice) "," }}{{ if ne (index . 0) "none" }} exec "~/.ssh/network_detect/{{ index . 0 }}"{{ end }}
{{ if not (contains (index (index $item "ips") 0) "*") }}  HostName {{ index (index $item "ips") 0 }}{{ end }}
  User {{ index $item "user" | default "root" }}
{{- if index $item "key" }}
  IdentityFile ~/.ssh/public_keys/{{ $item.key }}.pub
{{- end -}}
{{- range $env, $env_val := (index $item "env" | default slice) }}
  SetEnv {{ $env }}={{ $env_val }}
{{- end }}
  ProxyJump {{ index . 1 }}
{{ end -}}
{{ end }}

# Use the "Host" directive to allow shell completion
{{- range (ds "server") }}
Host {{ .name }}
{{- end }}
{{ "" }}
Host *
  ServerAliveInterval 30
  ServerAliveCountMax 2
  SetEnv TERM=xterm-256color