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Added a gradle build tool plugin

* Enhanced gradle plugin to parse tasks from a quick execution of the tool
* Added a duplicated function for gradlew completion that uses gradlew internally. Builds like Gradle itself (built with Gradle) are sensitive to being run with a matching gradlew version.
* Fixed broken caching of gradle task names. Added - and -- argument completions.

Matthew Git McCullough authored on 14/06/2011 at 21:01:28
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plugins/gradle/gradle.plugin.zsh
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+#!zsh
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+##############################################################################
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+# A descriptive listing of core Gradle commands
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+############################################################################
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+function _gradle_core_commands() {
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+    local ret=1 state
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+    _arguments ':subcommand:->subcommand' && ret=0
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+
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+    case $state in
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+      subcommand)
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+        subcommands=(
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+          "properties:Display all project properties"
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+          "tasks:Calculate and display all tasks"
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+          "dependencies:Calculate and display all dependencies"
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+          "projects:Discover and display all sub-projects"
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+          "build:Build the project"
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+          "help:Display help"
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+        )
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+        _describe -t subcommands 'gradle subcommands' subcommands && ret=0
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+    esac
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+
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+    return ret
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+}
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+
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+function _gradle_arguments() {
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+    _arguments -C \
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+    '-a[Do not rebuild project dependencies]' \
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+    '-h[Help]' \
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+    '-D[System property]' \
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+    '-d[Log at the debug level]' \
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+    '--gui[Launches the Gradle GUI app]' \
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+    '--stop[Stop the Gradle daemon]' \
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+    '--daemon[Use the Gradle daemon]' \
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+    '--no-daemon[Do not use the Gradle daemon]' \
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+    '--no-opt[Do not perform any task optimization]' \
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+    '-i[Log at the info level]' \
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+    '-m[Dry run]' \
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+    '-P[Set a project property]' \
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+    '--profile[Profile the build time]' \
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+    '-q[Log at the quiet level (only show errors)]' \
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+    '-v[Print the Gradle version info]' \
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+    '-x[Specify a task to be excluded]' \
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+    '*::command:->command' \
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+    && return 0
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+}
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+
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+
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+##############################################################################
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+# Are we in a directory containing a build.gradle file?
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+############################################################################
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+function in_gradle() {
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+    if [[ -f build.gradle ]]; then
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+        echo 1
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+    fi
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+}
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+
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+############################################################################
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+# Define the stat_cmd command based on platform behavior
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+##########################################################################
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+stat -f%m . > /dev/null 2>&1
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+if [ "$?" = 0 ]; then
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+	stat_cmd=(stat -f%m)
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+else
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+	stat_cmd=(stat -L --format=%Y)
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+fi
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+
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+############################################################################## Examine the build.gradle file to see if its
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+# timestamp has changed, and if so, regen
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+# the .gradle_tasks cache file
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+############################################################################
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+_gradle_does_task_list_need_generating () {
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+  if [ ! -f .gradletasknamecache ]; then return 0;
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+  else
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+    accurate=$($stat_cmd .gradletasknamecache)
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+    changed=$($stat_cmd build.gradle)
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+    return $(expr $accurate '>=' $changed)
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+  fi
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+}
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+
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+
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+##############################################################################
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+# Discover the gradle tasks by running "gradle tasks --all"
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+############################################################################
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+_gradle_tasks () {
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+  if [ in_gradle ]; then
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+    _gradle_arguments
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+    if _gradle_does_task_list_need_generating; then
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+     gradle tasks --all | grep "^[ ]*[a-zA-Z0-9]*\ -\ " | sed "s/ - .*$//" | sed "s/[\ ]*//" > .gradletasknamecache
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+    fi
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+    compadd -X "==== Gradle Tasks ====" `cat .gradletasknamecache`
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+  fi
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+}
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+
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+_gradlew_tasks () {
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+  if [ in_gradle ]; then
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+    _gradle_arguments
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+    if _gradle_does_task_list_need_generating; then
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+     gradlew tasks --all | grep "^[ ]*[a-zA-Z0-9]*\ -\ " | sed "s/ - .*$//" | sed "s/[\ ]*//" > .gradletasknamecache
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+    fi
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+    compadd -X "==== Gradlew Tasks ====" `cat .gradletasknamecache`
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+  fi
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+}
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+
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+
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+##############################################################################
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+# Register the completions against the gradle and gradlew commands
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+############################################################################
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+compdef _gradle_tasks gradle
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+compdef _gradlew_tasks gradlew
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+
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+
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+##############################################################################
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+# Open questions for future improvements:
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+# 1) Should 'gradle tasks' use --all or just the regular set?
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+# 2) Should gradlew use the same approach as gradle?
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+# 3) Should only the " - " be replaced with a colon so it can work
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+#     with the richer descriptive method of _arguments?
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+#     gradle tasks | grep "^[a-zA-Z0-9]*\ -\ " | sed "s/ - /\:/"
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+#############################################################################