mirror of
https://github.com/fish-shell/fish-shell.git
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620 lines
21 KiB
C++
620 lines
21 KiB
C++
// Functions used for implementing the set builtin.
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#include "config.h" // IWYU pragma: keep
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#include <errno.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wctype.h>
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#include <algorithm>
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#include <iterator>
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#include <memory>
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#include <set>
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#include <string>
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#include <vector>
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#include "builtin.h"
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#include "common.h"
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#include "env.h"
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#include "expand.h"
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#include "fallback.h" // IWYU pragma: keep
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#include "io.h"
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#include "proc.h"
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#include "wgetopt.h"
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#include "wutil.h" // IWYU pragma: keep
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class parser_t;
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// Error message for invalid path operations.
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#define BUILTIN_SET_PATH_ERROR L"%ls: Warning: $%ls entry \"%ls\" is not valid (%s)\n"
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// Hint for invalid path operation with a colon.
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#define BUILTIN_SET_PATH_HINT L"%ls: Did you mean 'set %ls $%ls %ls'?\n"
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// Error for mismatch between index count and elements.
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#define BUILTIN_SET_ARG_COUNT \
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L"%ls: The number of variable indexes does not match the number of values\n"
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// Test if the specified variable should be subject to path validation.
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static const wcstring_list_t path_variables({L"PATH", L"CDPATH"});
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static int is_path_variable(const wchar_t *env) { return contains(path_variables, env); }
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/// Call env_set. If this is a path variable, e.g. PATH, validate the elements. On error, print a
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/// description of the problem to stderr.
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static int my_env_set(const wchar_t *key, const wcstring_list_t &val, int scope,
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io_streams_t &streams) {
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size_t i;
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int retcode = 0;
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const wchar_t *val_str = NULL;
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if (is_path_variable(key)) {
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// Fix for https://github.com/fish-shell/fish-shell/issues/199 . Return success if any path
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// setting succeeds.
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bool any_success = false;
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// Don't bother validating (or complaining about) values that are already present. When
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// determining already-present values, use ENV_DEFAULT instead of the passed-in scope
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// because in:
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//
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// set -l PATH stuff $PATH
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//
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// where we are temporarily shadowing a variable, we want to compare against the shadowed
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// value, not the (missing) local value. Also don't bother to complain about relative paths,
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// which don't start with /.
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wcstring_list_t existing_values;
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const env_var_t existing_variable = env_get_string(key, ENV_DEFAULT);
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if (!existing_variable.missing_or_empty())
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tokenize_variable_array(existing_variable, existing_values);
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for (i = 0; i < val.size(); i++) {
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const wcstring &dir = val.at(i);
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if (!string_prefixes_string(L"/", dir) || contains(existing_values, dir)) {
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any_success = true;
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continue;
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}
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int show_hint = 0;
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bool error = false;
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struct stat buff;
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if (wstat(dir, &buff) == -1) {
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error = true;
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} else if (!S_ISDIR(buff.st_mode)) {
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error = true;
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errno = ENOTDIR;
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} else if (waccess(dir, X_OK) == -1) {
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error = true;
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}
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if (!error) {
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any_success = true;
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} else {
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streams.err.append_format(_(BUILTIN_SET_PATH_ERROR), L"set", key, dir.c_str(),
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strerror(errno));
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const wchar_t *colon = wcschr(dir.c_str(), L':');
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if (colon && *(colon + 1)) {
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show_hint = 1;
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}
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}
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if (show_hint) {
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streams.err.append_format(_(BUILTIN_SET_PATH_HINT), L"set", key, key,
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wcschr(dir.c_str(), L':') + 1);
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}
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}
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// Fail at setting the path if we tried to set it to something non-empty, but it wound up
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// empty.
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if (!val.empty() && !any_success) {
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return 1;
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}
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}
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wcstring sb;
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if (!val.empty()) {
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for (i = 0; i < val.size(); i++) {
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sb.append(val[i]);
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if (i < val.size() - 1) {
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sb.append(ARRAY_SEP_STR);
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}
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}
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val_str = sb.c_str();
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}
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switch (env_set(key, val_str, scope | ENV_USER)) {
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case ENV_OK: {
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break;
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}
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case ENV_PERM: {
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streams.err.append_format(_(L"%ls: Tried to change the read-only variable '%ls'\n"),
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L"set", key);
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retcode = 1;
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break;
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}
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case ENV_SCOPE: {
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streams.err.append_format(
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_(L"%ls: Tried to set the special variable '%ls' with the wrong scope\n"), L"set",
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key);
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retcode = 1;
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break;
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}
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case ENV_INVALID: {
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streams.err.append_format(
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_(L"%ls: Tried to set the special variable '%ls' to an invalid value\n"), L"set",
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key);
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retcode = 1;
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break;
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}
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default: {
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DIE("unexpected env_set() ret val");
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break;
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}
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}
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return retcode;
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}
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/// Extract indexes from a destination argument of the form name[index1 index2...]
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///
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/// \param indexes the list to insert the new indexes into
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/// \param src the source string to parse
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/// \param name the name of the element. Return null if the name in \c src does not match this name
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/// \param var_count the number of elements in the array to parse.
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///
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/// \return the total number of indexes parsed, or -1 on error
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static int parse_index(std::vector<long> &indexes, const wchar_t *src, const wchar_t *name,
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size_t var_count, io_streams_t &streams) {
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size_t len;
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int count = 0;
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const wchar_t *src_orig = src;
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if (src == 0) {
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return 0;
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}
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while (*src != L'\0' && (iswalnum(*src) || *src == L'_')) src++;
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if (*src != L'[') {
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streams.err.append_format(_(BUILTIN_SET_ARG_COUNT), L"set");
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return 0;
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}
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len = src - src_orig;
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if ((wcsncmp(src_orig, name, len) != 0) || (wcslen(name) != (len))) {
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streams.err.append_format(
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_(L"%ls: Multiple variable names specified in single call (%ls and %.*ls)\n"), L"set",
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name, len, src_orig);
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return 0;
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}
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src++;
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while (iswspace(*src)) src++;
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while (*src != L']') {
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const wchar_t *end;
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long l_ind = fish_wcstol(src, &end);
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if (errno > 0) { // ignore errno == -1 meaning the int did not end with a '\0'
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streams.err.append_format(_(L"%ls: Invalid index starting at '%ls'\n"), L"set", src);
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return 0;
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}
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if (l_ind < 0) l_ind = var_count + l_ind + 1;
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src = end; //!OCLINT(parameter reassignment)
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if (*src == L'.' && *(src + 1) == L'.') {
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src += 2;
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long l_ind2 = fish_wcstol(src, &end);
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if (errno > 0) { // ignore errno == -1 meaning the int did not end with a '\0'
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return 1;
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}
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src = end; //!OCLINT(parameter reassignment)
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if (l_ind2 < 0) {
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l_ind2 = var_count + l_ind2 + 1;
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}
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int direction = l_ind2 < l_ind ? -1 : 1;
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for (long jjj = l_ind; jjj * direction <= l_ind2 * direction; jjj += direction) {
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// debug(0, L"Expand range [set]: %i\n", jjj);
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indexes.push_back(jjj);
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count++;
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}
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} else {
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indexes.push_back(l_ind);
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count++;
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}
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while (iswspace(*src)) src++;
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}
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return count;
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}
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static int update_values(wcstring_list_t &list, std::vector<long> &indexes,
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wcstring_list_t &values) {
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size_t i;
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// Replace values where needed.
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for (i = 0; i < indexes.size(); i++) {
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// The '- 1' below is because the indices in fish are one-based, but the vector uses
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// zero-based indices.
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long ind = indexes[i] - 1;
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const wcstring newv = values[i];
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if (ind < 0) {
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return 1;
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}
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if ((size_t)ind >= list.size()) {
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list.resize(ind + 1);
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}
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// free((void *) al_get(list, ind));
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list[ind] = newv;
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}
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return 0;
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}
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/// Erase from a list of wcstring values at specified indexes.
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static void erase_values(wcstring_list_t &list, const std::vector<long> &indexes) {
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// Make a set of indexes.
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// This both sorts them into ascending order and removes duplicates.
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const std::set<long> indexes_set(indexes.begin(), indexes.end());
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// Now walk the set backwards, so we encounter larger indexes first, and remove elements at the
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// given (1-based) indexes.
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std::set<long>::const_reverse_iterator iter;
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for (iter = indexes_set.rbegin(); iter != indexes_set.rend(); ++iter) {
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long val = *iter;
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if (val > 0 && (size_t)val <= list.size()) {
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// One-based indexing!
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list.erase(list.begin() + val - 1);
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}
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}
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}
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/// Print the names of all environment variables in the scope, with or without shortening, with or
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/// without values, with or without escaping
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static void print_variables(int include_values, int esc, bool shorten_ok, int scope,
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io_streams_t &streams) {
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wcstring_list_t names = env_get_names(scope);
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sort(names.begin(), names.end());
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for (size_t i = 0; i < names.size(); i++) {
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const wcstring key = names.at(i);
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const wcstring e_key = escape_string(key, 0);
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streams.out.append(e_key);
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if (include_values) {
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env_var_t value = env_get_string(key, scope);
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if (!value.missing()) {
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int shorten = 0;
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if (shorten_ok && value.length() > 64) {
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shorten = 1;
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value.resize(60);
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}
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wcstring e_value = esc ? expand_escape_variable(value) : value;
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streams.out.append(L" ");
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streams.out.append(e_value);
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if (shorten) {
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streams.out.push_back(ellipsis_char);
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}
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}
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}
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streams.out.append(L"\n");
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}
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}
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/// The set builtin creates, updates, and erases (removes, deletes) variables.
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int builtin_set(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
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wchar_t *cmd = argv[0];
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int argc = builtin_count_args(argv);
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// Flags to set the work mode.
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int local = 0, global = 0, exportv = 0;
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int erase = 0, list = 0, unexport = 0;
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int universal = 0, query = 0;
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bool shorten_ok = true;
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bool preserve_failure_exit_status = true;
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const int incoming_exit_status = proc_get_last_status();
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// Variables used for performing the actual work.
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wchar_t *dest = NULL;
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int retcode = STATUS_CMD_OK;
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int scope;
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int slice = 0;
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// Variables used for parsing the argument list. This command is atypical in using the "+"
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// (REQUIRE_ORDER) option for flag parsing. This is not typical of most fish commands. It means
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// we stop scanning for flags when the first non-flag argument is seen.
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static const wchar_t *short_options = L"+:LUeghlnqux";
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static const struct woption long_options[] = {{L"export", no_argument, NULL, 'x'},
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{L"global", no_argument, NULL, 'g'},
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{L"local", no_argument, NULL, 'l'},
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{L"erase", no_argument, NULL, 'e'},
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{L"names", no_argument, NULL, 'n'},
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{L"unexport", no_argument, NULL, 'u'},
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{L"universal", no_argument, NULL, 'U'},
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{L"long", no_argument, NULL, 'L'},
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{L"query", no_argument, NULL, 'q'},
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{L"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}};
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// Parse options to obtain the requested operation and the modifiers.
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int opt;
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wgetopter_t w;
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while ((opt = w.wgetopt_long(argc, argv, short_options, long_options, NULL)) != -1) {
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switch (opt) {
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case 'e': {
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erase = 1;
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preserve_failure_exit_status = false;
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break;
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}
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case 'n': {
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list = 1;
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preserve_failure_exit_status = false;
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break;
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}
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case 'x': {
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exportv = 1;
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break;
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}
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case 'l': {
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local = 1;
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break;
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}
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case 'g': {
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global = 1;
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break;
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}
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case 'u': {
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unexport = 1;
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break;
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}
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case 'U': {
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universal = 1;
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break;
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}
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case 'L': {
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shorten_ok = false;
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break;
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}
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case 'q': {
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query = 1;
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preserve_failure_exit_status = false;
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break;
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}
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case 'h': {
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builtin_print_help(parser, streams, cmd, streams.out);
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return STATUS_CMD_OK;
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}
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case ':': {
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streams.err.append_format(BUILTIN_ERR_MISSING, cmd, argv[w.woptind - 1]);
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return STATUS_INVALID_ARGS;
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}
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case '?': {
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builtin_unknown_option(parser, streams, cmd, argv[w.woptind - 1]);
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return STATUS_INVALID_ARGS;
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}
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default: {
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DIE("unexpected retval from wgetopt_long");
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break;
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}
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}
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}
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// Ok, all arguments have been parsed, let's validate them. If we are checking the existance of
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// a variable (-q) we can not also specify scope.
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if (query && (erase || list)) {
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streams.err.append_format(BUILTIN_ERR_COMBO, cmd);
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builtin_print_help(parser, streams, cmd, streams.err);
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return STATUS_INVALID_ARGS;
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}
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// We can't both list and erase variables.
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if (erase && list) {
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streams.err.append_format(BUILTIN_ERR_COMBO, cmd);
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builtin_print_help(parser, streams, cmd, streams.err);
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return STATUS_INVALID_ARGS;
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}
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// Variables can only have one scope.
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if (local + global + universal > 1) {
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streams.err.append_format(BUILTIN_ERR_GLOCAL, cmd);
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builtin_print_help(parser, streams, cmd, streams.err);
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return STATUS_INVALID_ARGS;
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}
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// Variables can only have one export status.
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if (exportv && unexport) {
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streams.err.append_format(BUILTIN_ERR_EXPUNEXP, argv[0]);
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builtin_print_help(parser, streams, cmd, streams.err);
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return STATUS_INVALID_ARGS;
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}
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// Calculate the scope value for variable assignement.
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scope = (local ? ENV_LOCAL : 0) | (global ? ENV_GLOBAL : 0) | (exportv ? ENV_EXPORT : 0) |
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(unexport ? ENV_UNEXPORT : 0) | (universal ? ENV_UNIVERSAL : 0) | ENV_USER;
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if (query) {
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// Query mode. Return the number of variables that do not exist out of the specified
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// variables.
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int i;
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for (i = w.woptind; i < argc; i++) {
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wchar_t *arg = argv[i];
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int slice = 0;
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dest = wcsdup(arg);
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assert(dest);
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if (wcschr(dest, L'[')) {
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slice = 1;
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*wcschr(dest, L'[') = 0;
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}
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if (slice) {
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std::vector<long> indexes;
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wcstring_list_t result;
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size_t j;
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env_var_t dest_str = env_get_string(dest, scope);
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if (!dest_str.missing()) tokenize_variable_array(dest_str, result);
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if (!parse_index(indexes, arg, dest, result.size(), streams)) {
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builtin_print_help(parser, streams, cmd, streams.err);
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retcode = 1;
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break;
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}
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for (j = 0; j < indexes.size(); j++) {
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long idx = indexes[j];
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if (idx < 1 || (size_t)idx > result.size()) {
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retcode++;
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}
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}
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} else {
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if (!env_exist(arg, scope)) {
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retcode++;
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}
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}
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free(dest);
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}
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return retcode;
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}
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if (list) {
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// Maybe we should issue an error if there are any other arguments?
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print_variables(0, 0, shorten_ok, scope, streams);
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return STATUS_CMD_OK;
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}
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if (w.woptind == argc) {
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// Print values of variables.
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if (erase) {
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streams.err.append_format(_(L"%ls: Erase needs a variable name\n"), cmd);
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builtin_print_help(parser, streams, cmd, streams.err);
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retcode = STATUS_INVALID_ARGS;
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} else {
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print_variables(1, 1, shorten_ok, scope, streams);
|
|
}
|
|
|
|
return retcode;
|
|
}
|
|
|
|
dest = wcsdup(argv[w.woptind]);
|
|
assert(dest);
|
|
|
|
if (wcschr(dest, L'[')) {
|
|
slice = 1;
|
|
*wcschr(dest, L'[') = 0;
|
|
}
|
|
|
|
if (!valid_var_name(dest)) {
|
|
streams.err.append_format(BUILTIN_ERR_VARNAME, cmd, dest);
|
|
builtin_print_help(parser, streams, argv[0], streams.err);
|
|
return STATUS_INVALID_ARGS;
|
|
}
|
|
|
|
// Set assignment can work in two modes, either using slices or using the whole array. We detect
|
|
// which mode is used here.
|
|
if (slice) {
|
|
// Slice mode.
|
|
std::vector<long> indexes;
|
|
wcstring_list_t result;
|
|
|
|
const env_var_t dest_str = env_get_string(dest, scope);
|
|
if (!dest_str.missing()) {
|
|
tokenize_variable_array(dest_str, result);
|
|
} else if (erase) {
|
|
retcode = 1;
|
|
}
|
|
|
|
if (!retcode) {
|
|
for (; w.woptind < argc; w.woptind++) {
|
|
if (!parse_index(indexes, argv[w.woptind], dest, result.size(), streams)) {
|
|
builtin_print_help(parser, streams, argv[0], streams.err);
|
|
retcode = 1;
|
|
break;
|
|
}
|
|
|
|
size_t idx_count = indexes.size();
|
|
size_t val_count = argc - w.woptind - 1;
|
|
|
|
if (!erase) {
|
|
if (val_count < idx_count) {
|
|
streams.err.append_format(_(BUILTIN_SET_ARG_COUNT), argv[0]);
|
|
builtin_print_help(parser, streams, argv[0], streams.err);
|
|
retcode = 1;
|
|
break;
|
|
}
|
|
if (val_count == idx_count) {
|
|
w.woptind++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!retcode) {
|
|
// Slice indexes have been calculated, do the actual work.
|
|
if (erase) {
|
|
erase_values(result, indexes);
|
|
my_env_set(dest, result, scope, streams);
|
|
} else {
|
|
wcstring_list_t value;
|
|
|
|
while (w.woptind < argc) {
|
|
value.push_back(argv[w.woptind++]);
|
|
}
|
|
|
|
if (update_values(result, indexes, value)) {
|
|
streams.err.append_format(L"%ls: ", argv[0]);
|
|
streams.err.append_format(ARRAY_BOUNDS_ERR);
|
|
streams.err.push_back(L'\n');
|
|
}
|
|
|
|
my_env_set(dest, result, scope, streams);
|
|
}
|
|
}
|
|
} else {
|
|
w.woptind++;
|
|
// No slicing.
|
|
if (erase) {
|
|
if (w.woptind != argc) {
|
|
streams.err.append_format(_(L"%ls: Values cannot be specfied with erase\n"),
|
|
argv[0]);
|
|
builtin_print_help(parser, streams, argv[0], streams.err);
|
|
retcode = 1;
|
|
} else {
|
|
retcode = env_remove(dest, scope);
|
|
}
|
|
} else {
|
|
wcstring_list_t val;
|
|
for (int i = w.woptind; i < argc; i++) val.push_back(argv[i]);
|
|
retcode = my_env_set(dest, val, scope, streams);
|
|
}
|
|
}
|
|
|
|
// Check if we are setting variables above the effective scope. See
|
|
// https://github.com/fish-shell/fish-shell/issues/806
|
|
env_var_t global_dest = env_get_string(dest, ENV_GLOBAL);
|
|
if (universal && !global_dest.missing()) {
|
|
streams.err.append_format(
|
|
_(L"%ls: Warning: universal scope selected, but a global variable '%ls' exists.\n"),
|
|
L"set", dest);
|
|
}
|
|
|
|
free(dest);
|
|
|
|
if (retcode == STATUS_CMD_OK && preserve_failure_exit_status) retcode = incoming_exit_status;
|
|
return retcode;
|
|
}
|