Add w3mdict.cgi to use a dictd dictionary query

Bug-Debian: https://github.com/tats/w3m/issues/30

scripts/w3mdict.cgi

@@ -0,0 +1,56 @@
+#!/bin/sh
+# w3mdict.cgi - A dictd dictionary query cgi for w3m
+#
+# REQUIREMENTS:
+# + dict client software
+# + an address of a dict server, for variable ${DICT_SERVER}
+# + a name of a favorite database on that server, for variable
+#   ${FAVORITE_DATABASE}
+# OPTIONALLY:
+# + locally install a dict server (eg. dictd) and a collection
+#   of dict databases (eg. wordnet, aka "wn")
+
+DICT_SERVER="localhost"
+FAVORITE_DATABASE="wn"
+RETURN_MESSAGE="\n\nPress 'B' to return to the previous page."
+printf "Content-type: text/plain\n"
+type dict \
+|| {
+  # Originally, we inconsiderately failed silently ...
+  #     printf "W3m-control: BACK\n\n"
+  printf "\n\nERROR: dict client software not found${RETURN_MESSAGE}"
+  exit
+  }
+# First, we check only our best and favorite database. This is most
+# likely to give us a best defintion, and avoids displaying a long and
+# cluttered page with entries from many databases.
+dict --host "${DICT_SERVER}" \
+     --database "${FAVORITE_DATABASE}" \
+     "${QUERY_STRING}" 2>&1 \
+&& {
+  printf "${RETURN_MESSAGE}"
+  } \
+|| {
+  # The initial attempt failed, so let's search ALL databases
+  # available on the server.
+  dict --host "${DICT_SERVER}" \
+       "${QUERY_STRING}" 2>&1 \
+  && {
+    printf "${RETURN_MESSAGE}"
+    } \
+  || {
+    # No defintions were found in any of the server's databases, so
+    # let's return to the favorite database in order to retrieve its
+    # guess of what we meant to type. Originally, for this case, we
+    # pushed the user's default action to be entering another word for
+    # a dict defintion, so the print command was:
+    #     printf "W3m-control: DICT_WORD\n\n"
+    # Now, we need only print a blank line to separate the cgi header
+    # from the page content.
+    printf "\n"
+    dict --host "${DICT_SERVER}" \
+         --database "${FAVORITE_DATABASE}" \
+         "${QUERY_STRING}" 2>&1
+    printf "${RETURN_MESSAGE}"
+    }
+  }