Add function to search Dash.app (#2557)

* Add function to search Dash

* Pass all arguements instead of just the first

* Adding docset completion with help from @kapeli and [arx]

plugins/dash/dash.plugin.zsh

+# Usage: dash [keyword:]query
+dash() { open dash://"$*" }
+compdef _dash dash
+
+_dash() {
+  # No sense doing this for anything except the 2nd position and if we haven't
+  # specified which docset to query against
+  if [[ $CURRENT -eq 2 && ! "$words[2]" =~ ":" ]]; then
+    local -a _all_docsets
+    _all_docsets=()
+    # Use defaults to get the array of docsets from preferences
+    # Have to smash it into one big line so that each docset is an element of
+    # our DOCSETS array
+    DOCSETS=("${(@f)$(defaults read com.kapeli.dash docsets | tr -d '\n' | grep -oE '\{.*?\}')}")
+
+    # remove all newlines since defaults prints so pretty like
+    # Now get each docset and output each on their own line
+    for doc in "$DOCSETS[@]"; do
+      # Only output docsets that are actually enabled
+      if [[ "`echo $doc | grep -Eo \"isEnabled = .*?;\" | sed 's/[^01]//g'`" == "0" ]]; then
+        continue
+      fi
+
+      keyword=''
+
+      # Order of preference as explained to me by @kapeli via email
+      KEYWORD_LOCATORS=(keyword suggestedKeyword platform)
+      for locator in "$KEYWORD_LOCATORS[@]"; do
+        # Echo the docset, try to find the appropriate keyword
+        # Strip doublequotes and colon from any keyword so that everything has the
+        # same format when output (we'll add the colon in the completion)
+        keyword=`echo $doc | grep -Eo "$locator = .*?;" | sed -e "s/$locator = \(.*\);/\1/" -e "s/[\":]//g"`
+        if [[ ! -z "$keyword" ]]; then
+          # if we fall back to platform, we should do some checking per @kapeli
+          if [[ "$locator" == "platform" ]]; then
+            # Since these are the only special cases right now, let's not do the
+            # expensive processing unless we have to
+            if [[ "$keyword" == "python" ||  "$keyword" == "java" || \
+                  "$keyword" == "qt" || "$keyword" == "cocs2d" ]]; then
+              docsetName=`echo $doc | grep -Eo "docsetName = .*?;" | sed -e "s/docsetName = \(.*\);/\1/" -e "s/[\":]//g"`
+              if [[ "$keyword" == "python" ]]; then
+                if [[ "$docsetName" == "Python 2" ]]; then
+                  keyword="python2"
+                elif [[ "$docsetName" == "Python 3" ]]; then
+                  keyword="python3"
+                fi
+              elif [[ "$keyword" == "java" ]]; then
+                if [[ "$docsetName" == "Java SE7" ]]; then
+                  keyword="java7"
+                elif [[ "$docsetName" == "Java SE6" ]]; then
+                  keyword="java6"
+                elif [[ "$docsetName" == "Java SE8" ]]; then
+                  keyword="java8"
+                fi
+              elif [[ "$keyword" == "qt" ]]; then
+                if [[ "$docsetName" == "Qt 5" ]]; then
+                  keyword="qt5"
+                elif [[ "$docsetName" == "Qt 4" ]]; then
+                  keyword="qt4"
+                elif [[ "$docsetName" == "Qt" ]]; then
+                  keyword="qt4"
+                fi
+              elif [[ "$keyword" == "cocos2d" ]]; then
+                if [[ "$docsetName" == "Cocos3D" ]]; then
+                  keyword="cocos3d"
+                fi
+              fi
+            fi
+          fi
+
+          # Bail once we have a match
+          break
+        fi
+      done
+
+      # If we have a keyword, add it to the list!
+      if [[ ! -z "$keyword" ]]; then
+        _all_docsets+=($keyword)
+      fi
+    done
+
+    # special thanks to [arx] on #zsh for getting me sorted on this piece
+    compadd -qS: -- "$_all_docsets[@]"
+    return
+  fi
+}