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#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdarg.h>
#include <readline/readline.h>
#include <readline/history.h>
#include "rl.h"
#include "cmd.h"
#include "parse.h"
static char* saved_line;
static int saved_point, saved_end;
void _rl_printf_start() {
// save line
saved_line = rl_copy_text(0, rl_end);
saved_point = rl_point;
saved_end = rl_end;
// clear line
rl_save_prompt();
rl_replace_line("", 0);
rl_redisplay();
}
void _rl_printf_stop() {
rl_restore_prompt();
rl_replace_line(saved_line, 0);
rl_point = saved_point;
rl_end = saved_end;
rl_redisplay();
free(saved_line);
}
void rl_printf(const char *fmt, ...) {
_rl_printf_start();
va_list args;
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
_rl_printf_stop();
}
static void cli_cmd(char* cmd) {
cmd += strspn(cmd, IFS); // skip leading whitespace
char* line = consume_token(cmd, IFS);
for (size_t i = 0; i < cmds_length; i++) {
if (strncmp(cmds[i].name, cmd, strlen(cmd)) != 0)
continue;
cmds[i].handle(line);
return;
}
printf("unknown command!\n");
}
static char* rl_completion_entries(const char *text, int state) {
static size_t i = 0;
if (state == 0) i = 0;
while (i < cmds_length) {
cmd_t cmd = cmds[i];
i++;
if (strncmp(text, cmd.name, strlen(text)) == 0) {
return strdup(cmd.name);
}
}
return NULL;
}
static char** rl_attempted_completion(const char * text, int start, int end) {
// do not suggest filenames
rl_attempted_completion_over = 1;
// if first word in line buffer -> complete commands from cmds[]
size_t cmd_start = strspn(rl_line_buffer, IFS);
if (start == cmd_start)
return rl_completion_matches(text, rl_completion_entries);
// else, check specialized completion functions
size_t cmd_len = strcspn(rl_line_buffer + cmd_start, IFS);
for (size_t i = 0; i < cmds_length; i++) {
cmd_t cmd = cmds[i];
if (cmd.complete == NULL) continue;
if (strncmp(cmd.name, rl_line_buffer + cmd_start, cmd_len) != 0) continue;
return cmd.complete(text, start, end);
}
// else, no completion available
return NULL;
}
int cli_main() {
char* input = NULL;
rl_attempted_completion_function = rl_attempted_completion;
while (1) {
if (input != NULL) free(input);
input = readline(CLI_PROMPT);
if (input == NULL) return EXIT_SUCCESS; // exit on ^D (EOF)
if (*input == '\0') continue; // ignore empty lines
add_history(input);
cli_cmd(input);
}
return EXIT_SUCCESS;
}
int rl_word(const char * line, int cursor) {
int word = -1;
for (int i = 0; line[i] != '\0';) {
i += strspn(line + i, IFS);
int len = strcspn(line + i, IFS);
word++;
i += len;
if (i > cursor) break;
}
return word;
}
/// \internal
typedef struct {
const char * word;
const char ** options;
} __rl_complete_list_data_t;
char** rl_complete_list(const char * word, const char ** options) {
__rl_complete_list_data_t data = {
.word = word,
.options = options,
};
return rl_completion_matches((char *) &data, [](const char * text, int state) -> char * {
__rl_complete_list_data_t data = *(__rl_complete_list_data_t *) text;
static size_t i = 0;
if (state == 0) i = 0;
while (data.options[i] != NULL) {
const char * option = data.options[i++];
if (strncmp(data.word, option, strlen(data.word)) == 0)
return strdup(option);
}
return NULL;
});
}
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