Add bash completion script.

Author: ADmad

bin/bash_completion.sh

@@ -0,0 +1,47 @@
+#
+# Bash completion file for CakePHP console.
+# Copy this file to a file named `cake` under `/etc/bash_completion.d/`.
+# For more info check https://book.cakephp.org/4/en/console-commands/completion.html#how-to-enable-bash-autocompletion-for-the-cakephp-console
+#
+
+_cake()
+{
+    local cur prev opts cake
+    COMPREPLY=()
+    cake="${COMP_WORDS[0]}"
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+    if [[ "$cur" == -* ]] ; then
+        if [[ ${COMP_CWORD} = 1 ]] ; then
+            opts=$(${cake} completion options)
+        elif [[ ${COMP_CWORD} = 2 ]] ; then
+            opts=$(${cake} completion options "${COMP_WORDS[1]}")
+        else
+            opts=$(${cake} completion options "${COMP_WORDS[1]}" "${COMP_WORDS[2]}")
+        fi
+
+        COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+        return 0
+    fi
+
+    if [[ ${COMP_CWORD} = 1 ]] ; then
+        opts=$(${cake} completion commands)
+        COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+        return 0
+    fi
+
+    if [[ ${COMP_CWORD} = 2 ]] ; then
+        opts=$(${cake} completion subcommands $prev)
+        COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+        if [[ $COMPREPLY = "" ]] ; then
+            _filedir
+            return 0
+        fi
+        return 0
+    fi
+
+    return 0
+}
+
+complete -F _cake cake bin/cake