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Factor out fetching electric variables into a separate function

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This factors env_stack_t::get() a little better
This commit is contained in:
ridiculousfish 2019-04-10 16:02:49 -07:00
parent f35f2fe110
commit 341799194e
1 changed files with 34 additions and 29 deletions
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63
src/env.cpp
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@ -836,6 +836,39 @@ std::shared_ptr<const wcstring_list_t> env_var_t::empty_list() {
return result;
}
/// \return a the value of a variable for \p key, which must be electric (computed).
static maybe_t<env_var_t> get_electric(const wcstring &key, const environment_t &vars) {
if (key == L"history") {
// Big hack. We only allow getting the history on the main thread. Note that history_t
// may ask for an environment variable, so don't take the lock here (we don't need it).
if (!is_main_thread()) {
return none();
}
history_t *history = reader_get_history();
if (!history) {
history = &history_t::history_with_name(history_session_id(vars));
}
wcstring_list_t result;
if (history) history->get_history(result);
return env_var_t(L"history", result);
} else if (key == L"pipestatus") {
const auto js = proc_get_last_statuses();
wcstring_list_t result;
result.reserve(js.pipestatus.size());
for (int i : js.pipestatus) {
result.push_back(to_string(i));
}
return env_var_t(L"pipestatus", std::move(result));
} else if (key == L"status") {
return env_var_t(L"status", to_string(proc_get_last_status()));
} else if (key == L"umask") {
return env_var_t(L"umask", format_string(L"0%0.3o", get_umask()));
}
// We should never get here unless the electric var list is out of sync with the above code.
DIE("unrecognized electric var name");
}
maybe_t<env_var_t> env_stack_t::get(const wcstring &key, env_mode_flags_t mode) const {
const bool has_scope = mode & (ENV_LOCAL | ENV_GLOBAL | ENV_UNIVERSAL);
const bool search_local = !has_scope || (mode & ENV_LOCAL);
@ -849,35 +882,7 @@ maybe_t<env_var_t> env_stack_t::get(const wcstring &key, env_mode_flags_t mode)
// that in env_stack_t::set().
if (is_electric(key)) {
if (!search_global) return none();
if (key == L"history") {
// Big hack. We only allow getting the history on the main thread. Note that history_t
// may ask for an environment variable, so don't take the lock here (we don't need it).
if (!is_main_thread()) {
return none();
}
history_t *history = reader_get_history();
if (!history) {
history = &history_t::history_with_name(history_session_id(*this));
}
wcstring_list_t result;
if (history) history->get_history(result);
return env_var_t(L"history", result);
} else if (key == L"pipestatus") {
const auto js = proc_get_last_statuses();
wcstring_list_t result;
result.reserve(js.pipestatus.size());
for (int i : js.pipestatus) {
result.push_back(to_string(i));
}
return env_var_t(L"pipestatus", std::move(result));
} else if (key == L"status") {
return env_var_t(L"status", to_string(proc_get_last_status()));
} else if (key == L"umask") {
return env_var_t(L"umask", format_string(L"0%0.3o", get_umask()));
}
// We should never get here unless the electric var list is out of sync with the above code.
DIE("unerecognized electric var name");
return get_electric(key, *this);
}
if (search_local || search_global) {