An embeddable, thread-safe implementation of the cubescript language
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#ifdef CS_REPL_USE_READLINE
#ifndef CS_REPL_HAS_EDIT
#define CS_REPL_HAS_EDIT
/* use the GNU readline library */
#include <string.h>
#include <optional>
#include <ostd/string.hh>
#include <readline/readline.h>
#include <readline/history.h>
static cs_state *rd_cs = nullptr;
inline char *ln_complete_list(char const *buf, int state) {
static ostd::string_range cmd;
static ostd::iterator_range<cs_ident **> itr;
if (!state) {
cmd = get_complete_cmd(buf);
itr = rd_cs->get_idents();
}
for (; !itr.empty(); itr.pop_front()) {
cs_ident *id = itr.front();
if (!id->is_command()) {
continue;
}
ostd::string_range idname = id->get_name();
if (idname.size() <= cmd.size()) {
continue;
}
if (idname.slice(0, cmd.size()) == cmd) {
itr.pop_front();
return strdup(idname.data());
}
}
return nullptr;
}
inline char **ln_complete(char const *buf, int, int) {
rl_attempted_completion_over = 1;
return rl_completion_matches(buf, ln_complete_list);
}
inline void ln_hint() {
cs_command *cmd = get_hint_cmd(*rd_cs, rl_line_buffer);
if (!cmd) {
rl_redisplay();
return;
}
std::string old = rl_line_buffer;
std::string args = old;
args += " [";
fill_cmd_args(args, cmd->get_args());
args += "] ";
rl_extend_line_buffer(args.size());
rl_replace_line(args.data(), 0);
rl_redisplay();
rl_replace_line(old.data(), 0);
}
inline void init_lineedit(cs_state &cs, ostd::string_range) {
rd_cs = &cs;
rl_attempted_completion_function = ln_complete;
rl_redisplay_function = ln_hint;
}
inline std::optional<std::string> read_line(cs_state &, cs_svar *pr) {
auto line = readline(pr->get_value().data());
if (!line) {
return std::string();
}
std::string ret = line;
free(line);
return std::move(ret);
}
inline void add_history(cs_state &, ostd::string_range line) {
/* backed by std::string so it's terminated */
add_history(line.data());
}
#endif
#endif