[tools] Add bash autocomplete script for iree-opt/iree-compile (iree-org#22424)

Author: Groverkss

tools/scripts/iree-tools-argcomplete.bash

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Include this script in your shell PATH to enable argument completion for IREE
+# tools.
+
+_iree_tools_autocomplete() {
+    local tool="$1"
+    local commands
+    local cur
+
+    # Get the list of commands from the appropriate tool's `--help-list`
+    commands=$($tool --help-list | awk '{print $1}' | grep -v '^ *=' | sed 's/[=<].*//')
+
+    cur=${COMP_WORDS[COMP_CWORD]}
+
+    case "$cur" in
+      -*)
+        COMPREPLY=($(compgen -W "$commands" -- "${cur}"))
+        ;;
+      *)
+        COMPREPLY=($(compgen -f -- "${cur}"))
+        ;;
+    esac
+
+    return 0
+}
+
+# Register the completion function for iree-opt
+complete -F _iree_tools_autocomplete iree-opt
+# Register the completion function for iree-compile
+complete -F _iree_tools_autocomplete iree-compile