[debug+dev] riot checks and fix ipv6 support, fix crontab installation; antigen use F-Sy-H (#39)

* format: remove space

* sry but..., riot: 'i' for 'ibd', and remove support for ebd

* fix ipv6 support

* validate port and username

* install.sh: failed to add to crontab when there's no crontab

* sync zdharma-continuum/fast-syntax-highlighting

* use fast-syntax-highlighting instead

---------

Co-authored-by: xiongdian.me <xiongdian.me@bytedance.com>

scripts/riot

@@ -5,6 +5,19 @@ source "$THIS_DIR/../tools/common.sh"
 RIOT_TRUST_CLIENT=${RIOT_TRUST_CLIENT:-${DFS_TRUST:-0}}
 RIOT_TRUST_SERVER=${RIOT_TRUST_SERVER:-0}
 
+# check if port number valid
+check_port() {
+    ( echo $1 | grep -qxE "[1-9][0-9]{0,4}" ) || return 1
+    test $1 -lt 65536 -a $1 -gt 0 || return 1
+    return 0
+}
+
+# check if username valid
+check_username() {
+    ( echo $1 | grep -qxE "^[a-z][-a-z0-9_]*\$" ) || return 1
+    return 0
+}
+
 # get single server setting
 # may be called more than once
 get_server_meta() {
@@ -20,22 +33,24 @@ get_server_meta() {
     if [[ "$remote" == *@* ]]; then
         RET_USERNAME=${remote%%@*}
         remote=${remote#*@}
+        check_username $RET_USERNAME || fmt_fatal invalid username \"$RET_USERNAME\"
     fi
     # if in the form ...:22
-    if [[ "$remote" == *:* ]]; then
+    if [[ "$remote" == "["*"]":* || ( "$remote" != "["*"]" && "$remote" == *:* ) ]]; then
         RET_PORT=${remote##*:}
         remote=${remote%:*}
+        check_port $RET_PORT || fmt_fatal invalid port number \"$RET_PORT\"
     fi
     # presets -- match domain
     local domain=${remote##*.}
     local host=${remote%.*}
     # if there's no dot
-    if [[ "$host" == "$domain" ]]; then
+    if [[ "$host" == "$domain" && "$host" != "["*"]" ]]; then
         domain="ibd"
     fi
     case $domain in
-        ibd|ebd )
-            RET_HOSTNAME=$host.$domain.ink
+        i|ibd )
+            RET_HOSTNAME=$host.ibd.ink
             RET_PORT=${RET_PORT:-12022}
             RET_USERNAME=${RET_USERNAME:-root}
             RET_TRUST_SERVER=1
@@ -76,7 +91,7 @@ parse_remote() {
     local remote="$1"
     local jump_servers=""
     # loop for jump servers
-    while [[ -n $remote ]]; do 
+    while [[ -n $remote ]]; do
         local server=${remote%%,*}
         remote=${remote#*,}
         get_server_meta "$server"