add support of flag

Closes #1

README.md

@@ -57,6 +57,7 @@ x -> y -> z
 - pad
 - sketch
 - force-appendix
+- center
 
 # Limitation
 

flake.lock

@@ -71,10 +71,10 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1679320645,
-        "narHash": "sha256-sctCiWAvsKAoLGd11toK+Paj3EhJnIs+pjeTHmlFW4w=",
+        "lastModified": 1679320952,
+        "narHash": "sha256-L7x8BwHWGFILwvXTluKJkfkSYZQxPbSXrzDc/HC80Oc=",
         "ref": "refs/heads/main",
-        "rev": "87a7e67b8339f85723e8ebdbab2050b2e727b36a",
+        "rev": "88e2a5beb95722b454f081e5b766eef8f908eeb3",
         "revCount": 30,
         "type": "git",
         "url": "https://git.pleshevski.ru/mynix/tools"

wd2

@@ -23,6 +23,7 @@ cli and overwrite cli parameters with the same name.
 - pad
 - sketch
 - force-appendix
+- center
 
 -------------------------------------------------------------------------------
 
@@ -80,6 +81,7 @@ d2_pad=$(get_attr_value "pad")
 d2_sketch=$(get_attr_value "sketch")
 d2_port=$(get_attr_value "port")
 d2_force_appendix=$(get_attr_value "force-appendix")
+d2_center=$(get_attr_value "center")
 set -e
 
 d2 "${d2_args[@]}" \
@@ -90,4 +92,5 @@ d2 "${d2_args[@]}" \
   ${d2_sketch:+--sketch=${d2_sketch}} \
   ${d2_port:+--port=${d2_port}} \
   ${d2_force_appendix:+--force-appendix=${d2_force_appendix}}
+  ${d2_center:+--center=${d2_center}}