"""'Hints' example for Hexrays Decompiler

Handle 'hxe_create_hint' notification using hooks, to return our own.
If the object under the cursor is:
 - a function call, prefix the original decompiler hint with "==> "
 - a local variable declaration, replace the hint with our own in the form of "!{varname}" (where '{varname}' is replaced w/ the variable name)
 - an 'if' statement, replace the hint with our own, saying "condition"
"""

import ida_idaapi
import ida_hexrays

class hint_hooks_t(ida_hexrays.Hexrays_Hooks):
    def create_hint(self, vu):
        if vu.get_current_item(ida_hexrays.USE_MOUSE):
            cit = vu.item.citype
            if cit == ida_hexrays.VDI_LVAR:
                return 1, "!%s" % vu.item.l.name, 1
            elif cit == ida_hexrays.VDI_EXPR:
                ce = vu.item.e
                if ce.op == ida_hexrays.cot_call:
                    return 2, "==> ", 1
                if ce.op == ida_hexrays.cit_if:
                    return 1, "condition", 1
        return 0

vds_hooks = hint_hooks_t()
vds_hooks.hook()