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Fix stomping of last_option_requires_param

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This flag determines whether or not more shortopt switches will be offered up as
potential completions (vs only the payload for the last-parsed shortopt switch).

Previously, it was being stomped before it was determined whether or not two
`complete` rules with different `result_mode.requires_param` values were
actually resolved against the current command line or not, and the last
evaluated completion rule would win out.

There are two changes here:
* `last_option_requires_param` is only assigned if all associated conditions for
  a potential completion are also met, and
* If already assigned by a conflicting rule (which can only be user/developer
  error), `last_option_requires_param` is allowed to change from true to false
  but not the other way around (i.e. in case of a conflict, generate both
  payloads and other shortopt completions)

The first change is immediately noticeable and affects many of our own
completions, see the discussion in #9221 for an example regarding `git` where
`-c` has any of about a million different possible meanings depending on which
completion preconditions have been met. The second change should only happen if
a dev/user mistakenly enters a `complete -c ...` rule for the same shortopt more
than once, both with conditions matching, sometimes requiring an argument and
not sometimes not. It should be a rare occurence.
This commit is contained in:
Mahmoud Al-Qudsi 2022-09-20 21:49:30 -05:00
parent 379ad245e4
commit 663919228b
1 changed files with 27 additions and 8 deletions
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27
src/complete.cpp
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@ -856,7 +856,10 @@ bool completer_t::complete_param_for_command(const wcstring &cmd_orig, const wcs
// the lock because callouts (like the condition) may add or remove completions. See issue 2.
for (const option_list_t &options : all_options) {
size_t short_opt_pos = short_option_pos(str, options);
bool last_option_requires_param = false, use_common = true;
// We want last_option_requires_param to default to false but distinguish between when
// a previous completion has set it to false and when it has its default value.
maybe_t<bool> last_option_requires_param = none();
bool use_common = true;
if (use_switches) {
if (str[0] == L'-') {
// Check if we are entering a combined option and argument (like --color=auto or
@ -866,18 +869,29 @@ bool completer_t::complete_param_for_command(const wcstring &cmd_orig, const wcs
if (o.type == option_type_short) {
if (short_opt_pos == wcstring::npos) continue;
if (o.option.at(0) != str.at(short_opt_pos)) continue;
last_option_requires_param = o.result_mode.requires_param;
arg = str.c_str() + short_opt_pos + 1;
} else {
arg = param_match2(&o, str.c_str());
}
if (arg != nullptr && this->condition_test(o.condition)) {
if (this->condition_test(o.condition)) {
if (o.type == option_type_short) {
// Only override a true last_option_requires_param value with a false one
if (last_option_requires_param.has_value()) {
last_option_requires_param =
last_option_requires_param && o.result_mode.requires_param;
} else {
last_option_requires_param = o.result_mode.requires_param;
}
}
if (arg != nullptr) {
if (o.result_mode.requires_param) use_common = false;
if (o.result_mode.no_files) use_files = false;
if (o.result_mode.force_files) has_force = true;
complete_from_args(arg, o.comp, o.localized_desc(), o.flags);
}
}
}
} else if (popt[0] == L'-') {
// Set to true if we found a matching old-style switch.
// Here we are testing the previous argument,
@ -932,6 +946,11 @@ bool completer_t::complete_param_for_command(const wcstring &cmd_orig, const wcs
continue;
}
// Set a default value for last_option_requires_param only if one hasn't been set
if (!last_option_requires_param.has_value()) {
last_option_requires_param = false;
}
// Now we try to complete an option itself
for (const complete_entry_opt_t &o : options) {
// If this entry is for the base command, check if any of the arguments match.
@ -958,7 +977,7 @@ bool completer_t::complete_param_for_command(const wcstring &cmd_orig, const wcs
// Only complete when the last short option has no parameter yet..
if (short_opt_pos + 1 != str.size()) continue;
// .. and it does not require one ..
if (last_option_requires_param) continue;
if (*last_option_requires_param) continue;
// .. and the option is not already there.
if (str.find(optchar) != wcstring::npos) continue;
}