+# $0 [server] ([selector]) ([port]) ([mode])
+# server: the gopher server to dig to
+# selector: the gopher selector (default is empty)
+# port: the port to use (default is 70)
+# mode: the filetype mode (default depends upon selector)
+# 0: plain text
+# 1: menu (dir-like)
+# ...
+# download: fake mode to download the result without changes
+
+# ENV variables:
+# USE_DIALOG: force the usage of the command 'dialog'
+# : true if dialog is found
+# 0 : do not
+# 1 : force the use of dialog
+# LINK_COLOR: escape sequences colour (def: 2)
+# - : means no escape sequence
+# 1 : means colour 1
+# 2 : means colour 2
+# [...]
+# INVERT : invert the output for image viewing (for white backgrounds)
+# 0 : do not invert (default)
+# 1 : invert
+