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Remove a bunch of unnecessary copying in env.cpp

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This commit is contained in:
ridiculousfish 2017-12-22 17:31:25 -08:00
parent 2c5b49c3fe
commit efeb8e43a2
1 changed files with 21 additions and 38 deletions
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57
src/env.cpp
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@ -86,8 +86,9 @@ bool term_has_xn = false;
/// found in `TERMINFO_DIRS` we don't to call `handle_curses()` before we've imported the latter.
static bool env_initialized = false;
typedef std::unordered_map<const wcstring, void (*)(const wcstring &, const wcstring &)> var_dispatch_table_t;
var_dispatch_table_t var_dispatch_table;
typedef std::unordered_map<wcstring, void (*)(const wcstring &, const wcstring &)>
var_dispatch_table_t;
static var_dispatch_table_t var_dispatch_table;
/// List of all locale environment variable names that might trigger (re)initializing the locale
/// subsystem.
@ -371,27 +372,19 @@ static void fix_colon_delimited_var(const wcstring &var_name) {
const auto paths = env_get(var_name);
if (paths.missing_or_empty()) return;
bool modified = false;
wcstring_list_t pathsv;
wcstring_list_t new_pathsv;
paths->to_list(pathsv);
for (auto next_path : pathsv) {
if (next_path.empty()) {
next_path = L".";
modified = true;
}
new_pathsv.push_back(next_path);
}
if (!modified) {
return;
}
int retval = env_set(var_name, ENV_DEFAULT | ENV_USER, new_pathsv);
// See if there's any empties.
const wcstring empty = wcstring();
const wcstring_list_t &strs = paths->as_list();
if (std::find(strs.begin(), strs.end(), empty) != strs.end()) {
// Copy the list and replace empties with L"."
wcstring_list_t newstrs = strs;
std::replace(newstrs.begin(), newstrs.end(), empty, wcstring(L"."));
int retval = env_set(var_name, ENV_DEFAULT | ENV_USER, std::move(newstrs));
if (retval != ENV_OK) {
debug(0, L"fix_colon_delimited_var failed unexpectedly with retval %d", retval);
}
}
}
/// Initialize the locale subsystem.
static void init_locale() {
@ -399,7 +392,7 @@ static void init_locale() {
// invalidate the pointer from the this setlocale() call.
char *old_msg_locale = strdup(setlocale(LC_MESSAGES, NULL));
for (auto var_name : locale_variables) {
for (const auto &var_name : locale_variables) {
const auto var = env_get(var_name, ENV_EXPORT);
const std::string &name = wcs2string(var_name);
if (var.missing_or_empty()) {
@ -547,7 +540,7 @@ static bool initialize_curses_using_fallback(const char *term) {
/// Ensure the content of the magic path env vars is reasonable. Specifically, that empty path
/// elements are converted to explicit "." to make the vars easier to use in fish scripts.
static void init_path_vars() {
for (auto var_name : colon_delimited_variable) {
for (const auto &var_name : colon_delimited_variable) {
fix_colon_delimited_var(var_name);
}
}
@ -829,15 +822,15 @@ static void handle_curses_change(const wcstring &op, const wcstring &var_name) {
/// Populate the dispatch table used by `react_to_variable_change()` to efficiently call the
/// appropriate function to handle a change to a variable.
static void setup_var_dispatch_table() {
for (auto var_name : locale_variables) {
for (const auto &var_name : locale_variables) {
var_dispatch_table.emplace(var_name, handle_locale_change);
}
for (auto var_name : curses_variables) {
for (const auto &var_name : curses_variables) {
var_dispatch_table.emplace(var_name, handle_curses_change);
}
for (auto var_name : colon_delimited_variable) {
for (const auto &var_name : colon_delimited_variable) {
var_dispatch_table.emplace(var_name, handle_magic_colon_var_change);
}
@ -855,20 +848,10 @@ void env_init(const struct config_paths_t *paths /* or NULL */) {
setup_var_dispatch_table();
// These variables can not be altered directly by the user.
for (auto &k : {
wcstring(L"status"),
wcstring(L"history"),
wcstring(L"_"),
wcstring(L"PWD"),
wcstring(L"version") }) {
env_read_only.emplace(std::move(k));
// L"SHLVL" is readonly but will be inserted below after we increment it.
};
env_read_only.insert({L"status", L"history", L"_", L"PWD", L"version"});
// Names of all dynamically calculated variables.
env_electric.emplace(L"history");
env_electric.emplace(L"status");
env_electric.emplace(L"umask");
env_electric.insert({L"history", L"status", L"umask"});
// Now the environment variable handling is set up, the next step is to insert valid data.
@ -1350,7 +1333,7 @@ maybe_t<env_var_t> env_get(const wcstring &key, env_mode_flags_t mode) {
var_table_t::const_iterator result = env->env.find(key);
if (result != env->env.end()) {
const env_var_t var = result->second;
const env_var_t &var = result->second;
if (var.exportv ? search_exported : search_unexported) {
return var;
}