Merge pull request #361 from cncf/poc/tab_completion_265

poc of tab_completion

USAGE.md

@@ -73,7 +73,20 @@ crystal bin/ameba.cr
 crystal src/cnf-conformance.cr help 
 ```
 
+
+## Install Tab Completion
+
+NOTE: also compatible with the styles from kubectl completion install if you prefer
+https://kubernetes.io/docs/tasks/tools/install-kubectl/#enable-kubectl-autocompletion
+
+``` 
+./cnf-conformance completion -l error > test.sh
+source test.sh
+```
+
+
 ## Compatibility Tests
+
 #### :heavy_check_mark: To run all of the compatibility tests
 ```
 crystal src/cnf-conformance.cr compatibility

src/cnf-conformance.cr

@@ -51,4 +51,22 @@ task "test" do
   puts "ping"
 end
 
+# https://www.thegeekstuff.com/2013/12/bash-completion-complete/
+# https://kubernetes.io/docs/tasks/tools/install-kubectl/#enable-kubectl-autocompletion
+# https://stackoverflow.com/questions/43794270/disable-or-unset-specific-bash-completion
+desc "Install Shell Completion: check https://github.com/cncf/cnf-conformance/blob/master/USAGE.md for usage"
+task "completion" do |_|
+
+# assumes bash completion feel free to make a pr for zsh and check an arg for it
+bin_name = "cnf-conformance"
+
+completion_template = <<-TEMPLATE
+# to remove
+# complete -r #{bin_name}
+complete -W "#{Sam.root_namespace.all_tasks.map(&.name).join(" ")}" #{bin_name}
+TEMPLATE
+
+puts completion_template
+end
+
 Sam.help