add/improve a bunch of header directives

perl.nanorc

@@ -1,6 +1,8 @@
 ## Here is an example for Perl.
 ##
 syntax "perl" "\.p[lm]$"
+header "^#!.*/(env +)?perl( |$)"
+
 color red "\<(accept|alarm|atan2|bin(d|mode)|c(aller|h(dir|mod|op|own|root)|lose(dir)?|onnect|os|rypt)|d(bm(close|open)|efined|elete|ie|o|ump)|e(ach|of|val|x(ec|ists|it|p))|f(cntl|ileno|lock|ork))\>" "\<(get(c|login|peername|pgrp|ppid|priority|pwnam|(host|net|proto|serv)byname|pwuid|grgid|(host|net)byaddr|protobynumber|servbyport)|([gs]et|end)(pw|gr|host|net|proto|serv)ent|getsock(name|opt)|gmtime|goto|grep|hex|index|int|ioctl|join)\>" "\<(keys|kill|last|length|link|listen|local(time)?|log|lstat|m|mkdir|msg(ctl|get|snd|rcv)|next|oct|open(dir)?|ord|pack|pipe|pop|printf?|push|q|qq|qx|rand|re(ad(dir|link)?|cv|do|name|quire|set|turn|verse|winddir)|rindex|rmdir|s|scalar|seek(dir)?)\>" "\<(se(lect|mctl|mget|mop|nd|tpgrp|tpriority|tsockopt)|shift|shm(ctl|get|read|write)|shutdown|sin|sleep|socket(pair)?|sort|spli(ce|t)|sprintf|sqrt|srand|stat|study|substr|symlink|sys(call|read|tem|write)|tell(dir)?|time|tr(y)?|truncate|umask)\>" "\<(un(def|link|pack|shift)|utime|values|vec|wait(pid)?|wantarray|warn|write)\>"
 color magenta "\<(continue|else|elsif|do|for|foreach|if|unless|until|while|eq|ne|lt|gt|le|ge|cmp|x|my|sub|use|package|can|isa)\>"
 icolor cyan start="[$@%]" end="( |[^0-9A-Z_]|-)"

python.nanorc

@@ -1,6 +1,7 @@
 ## Here is an example for Python.
 ##
 syntax "python" "\.py$"
+header "^#!.*/(env +)?python( |$)"
 icolor brightred "def [0-9A-Z_]+"
 
 

ruby.nanorc

@@ -1,6 +1,8 @@
 ## Here is an example for Ruby.
 ##
 syntax "ruby" "\.rb$" "Gemfile" "config.ru" "Rakefile" "Capfile" "Vagrantfile"
+header "^#!.*/(env +)?ruby( |$)"
+
 ## Asciibetical list of reserved words
 color yellow "\<(BEGIN|END|alias|and|begin|break|case|class|def|defined\?|do|else|elsif|end|ensure|false|for|if|in|module|next|nil|not|or|redo|rescue|retry|return|self|super|then|true|undef|unless|until|when|while|yield)\>"
 ## Constants

sh.nanorc

@@ -1,7 +1,8 @@
 ## Here is an example for Bourne shell scripts.
 ##
 syntax "sh" "\.sh$" "\.bashrc" "bashrc" "\.bash_aliases" "bash_aliases" "\.bash_functions" "bash_functions" "\.bash_profile" "bash_profile"
-header "^#!.*/(ba)?sh"
+header "^#!.*/(env +)?(ba)?sh( |$)"
+
 icolor brightgreen "^[0-9A-Z_]+\(\)"
 color green "\<(case|do|done|elif|else|esac|exit|fi|for|function|if|in|local|read|return|select|shift|then|time|until|while)\>"
 color green "(\{|\}|\(|\)|\;|\]|\[|`|\\|\$|<|>|!|=|&|\|)"

zsh.nanorc

@@ -1,6 +1,6 @@
 ## Syntax highlighting for ZSH scripts (initially copied from sh.nanorc)
 syntax "zsh" "\.?zsh[^\.]+?$"
-header "^#!.*/zsh"
+header "^#!.*/(env +)?zsh( |$)"
 
 ## Numbers
 color brightwhite "[0-9]+"