Gradle tab completion for Bash. Works on both Mac and Linux.

completion-for-gradle.md

Gradle tab completion script for Bash

A tab completion script that works for Bash. Relies on the BSD md5 command on Mac and md5sum on Linux, so as long as you have one of those two commands, this should work.

Usage

$ gradle [TAB]

androidDependencies      check                    init                     properties
assemble                 clean                    installDebug             signingReport
assembleDebug            connectedCheck           installDebugTest         tasks
assembleDebugTest        connectedInstrumentTest  installRelease           uninstallAll
assembleRelease          dependencies             lint                     uninstallDebug
build                    dependencyInsight        lintDebug                uninstallDebugTest
buildDependents          deviceCheck              lintRelease              uninstallRelease
buildNeeded              help                     projects                 wrapper

$ gradle c[TAB]

check                    clean                    connectedCheck           connectedInstrumentTest

Gives tab completions relevent to the current Gradle project (if any).

Install

curl -L -s https://gist.github.com/nolanlawson/8694399/raw/gradle-tab-completion.bash \
  -o ~/gradle-tab-completion.bash

Then add to your ~/.bash_profile:

source ~/gradle-tab-completion.bash

It will be kinda slow the first time you use it. But after that, it'll be super fast, because everything's cached based on the md5sum of your build.gradle files.

Credits

Thanks to @ligi for Linux support!

gradle-tab-completion.bash

_gradle()
{
  local cur=${COMP_WORDS[COMP_CWORD]}
  local gradle_cmd='gradle'
  if [[ -x ./gradlew ]]; then
    gradle_cmd='./gradlew'
  fi
  if [[ -x ../gradlew ]]; then
    gradle_cmd='../gradlew'
  fi

  local commands=''
  local cache_dir="$HOME/.gradle_tabcompletion"
  mkdir -p $cache_dir

  # TODO: include the gradle version in the checksum?  It's kinda slow
  #local gradle_version=$($gradle_cmd --version --quiet --no-color | grep '^Gradle ' | sed 's/Gradle //g')
  
  local gradle_files_checksum='';
  if [[ -f build.gradle ]]; then # top-level gradle file
    if [[ -x `which md5 2 > /dev/null` ]]; then # mac
      local all_gradle_files=$(find . -name build.gradle 2>/dev/null)
      gradle_files_checksum=$(md5 -q -s "$(md5 -q $all_gradle_files)")
    else # linux
      gradle_files_checksum=($(find . -name build.gradle | xargs md5sum | md5sum))
    fi
  else # no top-level gradle file
    gradle_files_checksum='no_gradle_files'
  fi
  if [[ -f $cache_dir/$gradle_files_checksum ]]; then # cached! yay!
    commands=$(cat $cache_dir/$gradle_files_checksum)
  else # not cached! boo-urns!
    commands=$($gradle_cmd --no-color --quiet tasks | grep ' - ' | awk '{print $1}' | tr '\n' ' ')
    if [[ ! -z $commands ]]; then
      echo $commands > $cache_dir/$gradle_files_checksum
    fi
  fi
  COMPREPLY=( $(compgen -W "$commands" -- $cur) )
}
complete -F _gradle gradle
complete -F _gradle gradlew
complete -F _gradle ./gradlew

Nice stuff. But when the gradle build file happens to be broken at the time of completion, this fails (and gradle error message from standard error appears on console).

Ended up doing following modifications to task completion for my purposes:

• send error to /dev/null when Gradle does not complete succesfully (non-zero return code), no completions
• I prefer autocomplete not to go to the internets, so I used '--offline' flag
• as '--no-color' option is deprecated in favour of '--console=plain', I used that one
• as mentioned by @calid, '--all' can be added to tasks to get more completions
• ... and has been mentioned by @mgeis the completion picked up only tasks that had descriptions which output contained hyphen '-', to work around that I resorted to cut -d' ' -f1 | grep "^[a-z]" to filter tasks from Gradle output (which relies on convention of task names beginning with lowercase alphabetic character -- so far never encountered anything else :))

Snippet of changes:

_gradle() {
    local taskCandidates
    # ...
    else # not cached! boo-urns!
        taskCandidates=$(2>/dev/null $gradle_cmd --console=plain --offline --quiet tasks --all)
        if [ $? -ne 0 ] ; then
           return 13
        fi
        commands=$(echo "$taskCandidates" | cut -d' ' -f1 | grep "^[a-z]" | tr '\n' ' ')
        if [[ ! -z $commands ]]; then
            echo $commands > $cache_dir/$gradle_files_checksum
        else
            return 13
        fi
    # ...
}

my fork adds complete submodule support + flags + some of the improvements suggested here, if anyone interested

This script no longer works with Gradle version 3 because it uses the deprecated "--no-color" flag which is removed in Gradle version 3.

To fix this issue, please change it to --console=plain. I show the fix below:

diff --git a/gradle-tab-completion.bash b/gradle-tab-completion.bash
index 485cda2..f1f4bbe 100644
--- a/gradle-tab-completion.bash
+++ b/gradle-tab-completion.bash
@@ -14,7 +14,7 @@ _gradle()
   mkdir -p $cache_dir

   # TODO: include the gradle version in the checksum?  It's kinda slow
-  #local gradle_version=$($gradle_cmd --version --quiet --no-color | grep '^Gradle ' | sed 's/Gradle //g')
+  #local gradle_version=$($gradle_cmd --version --quiet --console=plain | grep '^Gradle ' | sed 's/Gradle //g')

   local gradle_files_checksum='';
   if [[ -f build.gradle ]]; then # top-level gradle file
@@ -30,7 +30,7 @@ _gradle()
   if [[ -f $cache_dir/$gradle_files_checksum ]]; then # cached! yay!
     commands=$(cat $cache_dir/$gradle_files_checksum)
   else # not cached! boo-urns!
-    commands=$($gradle_cmd --no-color --quiet tasks | grep ' - ' | awk '{print $1}' | tr '\n' ' ')
+    commands=$($gradle_cmd --console=plain --quiet tasks | grep ' - ' | awk '{print $1}' | tr '\n' ' ')
     if [[ ! -z $commands ]]; then
       echo $commands > $cache_dir/$gradle_f

Since I use gradle a lot and the gist is a little outdated, I've cloned the project to Github, added testing to fix any bugs, and improved the caching to support multiple repos.
https://github.com/meonlol/gradle-tab-completion

I'll add all other proposed changes to make one super-hyper-compatible version:
[+] Mac & Linux support
[+] per-project caching
[+] support tasks without descriptions
[+] support all tasks with --all
[+] since the tasks are local, we can go--offline
[ ] gitbash & cygwin support
[ ] commandline flags support
[ ] module support

@nolanlawson, could you please help me?
I got unexpected logs while using $ gradle [TAB]:

Here is the logs, probably you can figure out what's going on here:

iamtodors-MBP:custom-sensor-belt-view iamtodor$ gradle bash: md5sum: command not found
xargs: md5sum: No such file or directory
bash: /Users/iamtodor/.gradle_tabcompletion/: Is a directory

Doesn't provide any assistance for me. Using either with zsh or bash on MacOS - doesn't work.

@dodalovic the same situation

As of last week, Gradle has official support for tab completion:
Twitter announcement: https://twitter.com/gradle/status/839166051199787008
GitHub: https://github.com/gradle/gradle-completion