Merge pull request #599 from edubxb/gradle-completion

Add gradle completion

completion/available/gradle.completion.bash

@@ -0,0 +1,51 @@
+function __gradle {
+  local cur=${COMP_WORDS[COMP_CWORD]}
+  local tasks=''
+  local cache_dir="$HOME/.gradle/completion_cache"
+
+  case $OSTYPE in
+    darwin*)
+      local checksum_command="find . -name build.gradle -print0 | xargs -0 md5 -q | md5 -q"
+      local parsing_command="gradle --console=plain --quiet tasks | grep -v Rules | sed -nE -e 's/^([a-zA-Z]+)($| - .+)/\1/p'"
+      ;;
+    *)
+      local checksum_command="find . -name build.gradle -print0 | xargs -0 md5sum | md5sum | cut -d ' ' -f 1"
+      local parsing_command="gradle --console=plain --quiet tasks | grep -v Rules | sed -nr -e 's/^([a-zA-Z]+)($| - .+)/\1/p'"
+      ;;
+  esac
+
+  mkdir -p "${cache_dir}"
+
+  local gradle_files_checksum='no_cache_file'
+  if [[ -f build.gradle ]]; then
+    gradle_files_checksum="$(eval "${checksum_command}")"
+    if [[ -f "${cache_dir}/${gradle_files_checksum}" ]]; then
+      newest_gradle_file="$(find . -type f -name build.gradle -newer "${cache_dir}/${gradle_files_checksum}")"
+      if [ -n "${newest_gradle_file}" ]; then
+        tasks="$(eval "${parsing_command}")"
+        [[ -n "${tasks}" ]] && echo "${tasks}" > "${cache_dir}/${gradle_files_checksum}"
+      else
+        tasks="$(cat "${cache_dir}/${gradle_files_checksum}")"
+        touch "${cache_dir}/${gradle_files_checksum}"
+      fi
+    else
+      tasks="$(eval "${parsing_command}")"
+      [[ -n "${tasks}" ]] && echo "${tasks}" > "${cache_dir}/${gradle_files_checksum}"
+    fi
+  else
+    tasks="$(eval "${parsing_command}")"
+    [[ -n "${tasks}" ]] && echo "${tasks}" > "${cache_dir}/${gradle_files_checksum}"
+  fi
+  COMPREPLY=( $(compgen -W "${tasks}" -- "${cur}") )
+}
+
+function __clear_gradle_cache {
+  local cache_dir="$HOME/.gradle/completion_cache"
+  [[ -d "${cache_dir}" ]] && find "${cache_dir}" -type f -mtime +7 -exec rm -f {} \;
+}
+
+__clear_gradle_cache
+
+complete -F __gradle gradle
+complete -F __gradle gradlew
+complete -F __gradle ./gradlew