Add: ngrok completions (#4642)

Completions are based on the help messages of [ngrok](https://ngrok.com/)

CHANGELOG.md

@@ -33,6 +33,7 @@ This section is for changes merged to the `major` branch that are not also merge
   - `j` (autojump #4344)
   - `bd` (#4472)
   - `jhipster` (#4472)
+  - `ngrok` (#4642)
 - Improved completions for
   - `git` (#4395, #4396, #4592)
 

share/completions/ngrok.fish

@@ -0,0 +1,44 @@
+# Commands
+complete -c ngrok -f -a "authtoken" -d "Save authtoken to configuration file"
+complete -c ngrok -f -a "credits"   -d "Prints author and licensing information"
+complete -c ngrok -f -a "http"      -d "Start an HTTP tunnel"
+complete -c ngrok -f -a "start"     -d "Start tunnels by name from the configuration file"
+complete -c ngrok -f -a "tcp"       -d "Start a TCP tunnel"
+complete -c ngrok -f -a "tls"       -d "Start a TLS tunnel"
+complete -c ngrok -f -a "update"    -d "Update ngrok to the latest version"
+complete -c ngrok -f -a "version"   -d "Print the version string"
+complete -c ngrok -f -a "help"      -d "Shows a list of commands or help for one command"
+
+# General Options
+complete -c ngrok -l "help"       -e -f
+complete -c ngrok -l "authtoken"  -r                          -d "ngrok.com authtoken identifying a user"
+complete -c ngrok -l "config"     -r                          -d "path to config files; they are merged if multiple"
+complete -c ngrok -l "log"        -x -a "false stderr stdout" -d "path to log file, 'stdout', 'stderr' or 'false'"
+complete -c ngrok -l "log-format" -x -a "term logfmt json"    -d "log record format: 'term', 'logfmt', 'json'"
+complete -c ngrok -l "log-level"  -r -a "info"                -d "logging level"
+complete -c ngrok -l "region"     -x -a "us eu au ap"         -d "ngrok server region [us , eu, au, ap] (default: us)"
+
+# http & tls's options
+complete -c ngrok -l "hostname"  -r -d "host tunnel on custom hostname (requires DNS CNAME)"
+complete -c ngrok -l "subdomain" -r -d "host tunnel on a custom subdomain"
+
+# http's optons
+complete -c ngrok -l "auth"        -r                      -d "enforce basic auth on tunnel endpoint, 'user:password'"
+complete -c ngrok -l "bind-tls"    -x -a "both https http" -d "listen for http, https or both: true/false/both"
+complete -c ngrok -l "host-header" -r                      -d "set Host header; if 'rewrite' use local address hostname"
+complete -c ngrok -l "inspect"                             -d "enable/disable http introspection"
+
+# tls's options
+complete -c ngrok -l "client-cas" -r -d "path to TLS certificate authority to verify client certs"
+complete -c ngrok -l "crt"        -r -d "path to a TLS certificate for TLS termination"
+complete -c ngrok -l "key"        -r -d "path to a TLS key for TLS termination"
+
+# start's options
+complete -c ngrok -l "all"  -d "start all tunnels in the configuration file"
+complete -c ngrok -l "none" -d "start running no tunnels"
+
+# tcp's options
+complete -c ngrok -l "remote-addr" -r -d "bind remote address (requires you reserve an address)"
+
+# update's options
+complete -c ngrok -l "channel" -x -a "stable beta" -d "update channel (stable, beta)"