fish-shell/src/builtin_eval.cpp

// Functions for executing the eval builtin.
#include "config.h"  // IWYU pragma: keep

#include <cerrno>
#include <cstddef>

#include "builtin.h"
#include "common.h"
#include "exec.h"
#include "fallback.h"  // IWYU pragma: keep
#include "io.h"
#include "parser.h"
#include "proc.h"
#include "wgetopt.h"
#include "wutil.h"  // IWYU pragma: keep

/// Implementation of eval builtin.
int builtin_eval(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
    int argc = builtin_count_args(argv);

    wcstring new_cmd;
    for (int i = 1; i < argc; ++i) {
        if (i > 1) new_cmd += L' ';
        new_cmd += argv[i];
    }

    int status = STATUS_CMD_OK;
    if (argc > 1) {
        auto res = parser.eval(new_cmd, *streams.io_chain);
        if (res.was_empty) {
            // Issue #5692, in particular, to catch `eval ""`, `eval "begin; end;"`, etc.
            // where we have an argument but nothing is executed.
            status = STATUS_CMD_OK;
        } else {
            status = res.status.status_value();
        }
    }
    return status;
}