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prompt.c
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/* Copyright (c) 2006-2022 Jonas Fonseca <jonas.fonseca@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "tig/tig.h"
#include "tig/repo.h"
#include "tig/view.h"
#include "tig/draw.h"
#include "tig/display.h"
#include "tig/options.h"
#include "tig/prompt.h"
#include "tig/pager.h"
#include "tig/types.h"
#ifdef HAVE_READLINE
#include <readline/readline.h>
#include <readline/history.h>
#endif /* HAVE_READLINE */
static char *
prompt_input(const char *prompt, struct input *input)
{
enum input_status status = INPUT_OK;
unsigned char chars_length[SIZEOF_STR];
struct key key;
size_t promptlen = strlen(prompt);
int pos = 0, chars = 0;
int last_buf_length = promptlen ? -1 : promptlen;
input->buf[0] = 0;
input->context[0] = 0;
if (strlen(prompt) > 0)
curs_set(1);
while (status == INPUT_OK || status == INPUT_SKIP) {
int buf_length = strlen(input->buf) + promptlen;
int offset = pos || buf_length != last_buf_length ? pos + promptlen : -1;
last_buf_length = buf_length;
if (offset >= 0)
update_status_with_context(input->context, "%s%.*s", prompt, pos, input->buf);
else
wmove(status_win, 0, buf_length);
if (get_input(offset, &key) == OK) {
int len = strlen(key.data.bytes);
if (pos + len >= sizeof(input->buf)) {
report("Input string too long");
curs_set(0);
return NULL;
}
string_ncopy_do(input->buf + pos, sizeof(input->buf) - pos, key.data.bytes, len);
pos += len;
chars_length[chars++] = len;
status = input->handler(input, &key);
if (status != INPUT_OK) {
pos -= len;
chars--;
} else {
int changed_pos = strlen(input->buf);
if (changed_pos != pos) {
pos = changed_pos;
chars_length[chars - 1] = changed_pos - (pos - len);
}
}
} else {
status = input->handler(input, &key);
if (status == INPUT_DELETE) {
int len = chars_length[--chars];
pos -= len;
status = INPUT_OK;
} else {
int changed_pos = strlen(input->buf);
if (changed_pos != pos) {
pos = changed_pos;
chars_length[chars++] = changed_pos - pos;
}
}
}
input->buf[pos] = 0;
}
curs_set(0);
report_clear();
if (status == INPUT_CANCEL)
return NULL;
input->buf[pos++] = 0;
return input->buf;
}
enum input_status
prompt_default_handler(struct input *input, struct key *key)
{
switch (key_to_value(key)) {
case KEY_RETURN:
case KEY_ENTER:
case '\n':
return *input->buf || input->allow_empty ? INPUT_STOP : INPUT_CANCEL;
case KEY_BACKSPACE:
return *input->buf ? INPUT_DELETE : INPUT_CANCEL;
case KEY_ESC:
return INPUT_CANCEL;
default:
return INPUT_SKIP;
}
}
static enum input_status
prompt_script_handler(struct input *input, struct key *key)
{
switch (key_to_value(key)) {
case KEY_RETURN:
case KEY_ENTER:
case '\n':
return INPUT_STOP;
default:
return INPUT_OK;
}
}
static enum input_status
prompt_yesno_handler(struct input *input, struct key *key)
{
unsigned long c = key_to_unicode(key);
if (c == 'y' || c == 'Y')
return INPUT_STOP;
if (c == 'n' || c == 'N' || key_to_control(key) == 'C')
return INPUT_CANCEL;
return prompt_default_handler(input, key);
}
bool
prompt_yesno(const char *prompt)
{
char prompt2[SIZEOF_STR];
struct input input = { prompt_yesno_handler, false, NULL };
if (!string_format(prompt2, "%s [Yy/Nn]", prompt))
return false;
return !!prompt_input(prompt2, &input);
}
struct incremental_input {
struct input input;
input_handler handler;
bool edit_mode;
};
static enum input_status
read_prompt_handler(struct input *input, struct key *key)
{
struct incremental_input *incremental = (struct incremental_input *) input;
if (incremental->edit_mode && !key->modifiers.multibytes)
return prompt_default_handler(input, key);
if (!unicode_width(key_to_unicode(key), 8))
return INPUT_SKIP;
if (!incremental->handler)
return INPUT_OK;
return incremental->handler(input, key);
}
char *
read_prompt_incremental(const char *prompt, bool edit_mode, bool allow_empty, input_handler handler, void *data)
{
static struct incremental_input incremental = { { read_prompt_handler } };
incremental.input.allow_empty = allow_empty;
incremental.input.data = data;
incremental.input.buf[0] = 0;
incremental.input.context[0] = 0;
incremental.handler = handler;
incremental.edit_mode = edit_mode;
return prompt_input(prompt, (struct input *) &incremental);
}
#ifdef HAVE_READLINE
static volatile bool prompt_interrupted = false;
static void
readline_display(void)
{
update_status("%s%s", rl_display_prompt, rl_line_buffer);
wmove(status_win, 0, strlen(rl_display_prompt) + rl_point);
wrefresh(status_win);
}
static char *
readline_variable_generator(const char *text, int state)
{
static const char *vars[] = {
#define FORMAT_VAR(type, name, ifempty, initval) "%(" #name ")",
ARGV_ENV_INFO(FORMAT_VAR)
#undef FORMAT_VAR
#define FORMAT_VAR(type, name) "%(repo:" #name ")",
REPO_INFO(FORMAT_VAR)
#undef FORMAT_VAR
NULL
};
static int index, len;
const char *name;
char *variable = NULL; /* No match */
/* If it is a new word to complete, initialize */
if (!state) {
index = 0;
len = strlen(text);
}
/* Return the next name which partially matches */
while ((name = vars[index])) {
index++;
/* Complete or format a variable */
if (strncmp(name, text, len) == 0) {
if (strlen(name) > len)
variable = strdup(name);
else
variable = argv_format_arg(&argv_env, text);
break;
}
}
return variable;
}
static char *
readline_action_generator(const char *text, int state)
{
static const char *actions[] = {
"!",
"source",
"color",
"bind",
"set",
"toggle",
"goto",
"save-display",
"save-options",
"exec",
"echo",
#define REQ_GROUP(help)
#define REQ_(req, help) #req
REQ_INFO,
#undef REQ_GROUP
#undef REQ_
NULL
};
static int index, len;
const char *name;
char *match = NULL; /* No match */
/* If it is a new word to complete, initialize */
if (!state) {
index = 0;
len = strlen(text);
}
/* Return the next name which partially matches */
while ((name = actions[index])) {
name = enum_name(name);
index++;
if (strncmp(name, text, len) == 0) {
/* Ignore exact completion */
if (strlen(name) > len)
match = strdup(name);
break;
}
}
return match;
}
static char *
readline_set_generator(const char *text, int state)
{
static const char *words[] = {
#define DEFINE_OPTION_NAME(name, type, flags) #name " = ",
OPTION_INFO(DEFINE_OPTION_NAME)
#undef DEFINE_OPTION_NAME
NULL
};
static int index, len;
const char *name;
char *match = NULL; /* No match */
/* If it is a new word to complete, initialize */
if (!state) {
index = 0;
len = strlen(text);
}
/* Return the next name which partially matches */
while ((name = words[index])) {
name = enum_name(name);
index++;
if (strncmp(name, text, len) == 0) {
/* Ignore exact completion */
if (strlen(name) > len)
match = strdup(name);
break;
}
}
return match;
}
static char *
readline_toggle_generator(const char *text, int state)
{
static const char **words;
static int index, len;
const char *name;
char *match = NULL; /* No match */
if (!words) {
/* TODO: Only complete column options that are defined
* for the view. */
#define DEFINE_OPTION_WORD(name, type, flags) argv_append(&words, #name);
#define DEFINE_COLUMN_OPTIONS_WORD(name, type, flags) #name,
#define DEFINE_COLUMN_OPTIONS_WORDS(name, id, options) \
if (VIEW_COLUMN_##id != VIEW_COLUMN_SECTION) { \
const char *vars[] = { \
options(DEFINE_COLUMN_OPTIONS_WORD) \
}; \
char buf[SIZEOF_STR]; \
int i; \
for (i = 0; i < ARRAY_SIZE(vars); i++) { \
if (enum_name_prefixed(buf, sizeof(buf), #name, vars[i])) \
argv_append(&words, buf); \
} \
}
OPTION_INFO(DEFINE_OPTION_WORD)
COLUMN_OPTIONS(DEFINE_COLUMN_OPTIONS_WORDS);
}
/* If it is a new word to complete, initialize */
if (!state) {
index = 0;
len = strlen(text);
}
/* Return the next name which partially matches */
while ((name = words[index])) {
name = enum_name(name);
index++;
if (strncmp(name, text, len) == 0) {
/* Ignore exact completion */
if (strlen(name) > len)
match = strdup(name);
break;
}
}
return match;
}
static int
readline_getc(FILE *stream)
{
return get_input_char();
}
static char **
readline_completion(const char *text, int start, int end)
{
/* Do not append a space after a completion */
rl_completion_suppress_append = 1;
/*
* If the word is at the start of the line,
* then it is a tig action to complete.
*/
if (start == 0)
return rl_completion_matches(text, readline_action_generator);
/*
* If the line begins with "toggle", then we complete toggle options.
*/
if (start >= 7 && strncmp(rl_line_buffer, "toggle ", 7) == 0)
return rl_completion_matches(text, readline_toggle_generator);
/*
* If the line begins with "set", then we complete set options.
* (unless it is already completed)
*/
if (start >= 4 && strncmp(rl_line_buffer, "set ", 4) == 0 &&
!strchr(rl_line_buffer, '='))
return rl_completion_matches(text, readline_set_generator);
/*
* Otherwise it might be a variable name...
*/
if (strncmp(text, "%(", 2) == 0)
return rl_completion_matches(text, readline_variable_generator);
/*
* ... or finally fall back to filename completion.
*/
return NULL;
}
static void
readline_display_matches(char **matches, int num_matches, int max_length)
{
unsigned int i;
wmove(status_win, 0, 0);
waddstr(status_win, "matches: ");
/* matches[0] is the incomplete word */
for (i = 1; i < num_matches + 1; ++i) {
waddstr(status_win, matches[i]);
waddch(status_win, ' ');
}
wgetch(status_win);
wrefresh(status_win);
}
static void
readline_init(void)
{
/* Allow conditional parsing of the ~/.inputrc file. */
rl_readline_name = "tig";
/* Word break caracters (we removed '(' to match variables) */
rl_basic_word_break_characters = " \t\n\"\\'`@$><=;|&{";
/* Custom display function */
rl_redisplay_function = readline_display;
rl_getc_function = readline_getc;
/* Completion support */
rl_attempted_completion_function = readline_completion;
rl_completion_display_matches_hook = readline_display_matches;
/* Let ncurses deal with the LINES and COLUMNS environment variables */
rl_change_environment = 0;
rl_catch_sigwinch = 0;
rl_deprep_term_function = NULL;
rl_prep_term_function = NULL;
}
static void sigint_absorb_handler(int sig) {
signal(SIGINT, SIG_DFL);
prompt_interrupted = true;
rl_done = 1;
}
char *
read_prompt(const char *prompt)
{
static char *line = NULL;
HIST_ENTRY *last_entry;
if (line) {
free(line);
line = NULL;
}
curs_set(1);
if (signal(SIGINT, sigint_absorb_handler) == SIG_ERR)
die("Failed to setup sigint handler");
cbreak();
line = readline(prompt);
raw();
if (signal(SIGINT, SIG_DFL) == SIG_ERR)
die("Failed to remove sigint handler");
curs_set(0);
/* readline can leave the virtual cursor out-of-place */
set_cursor_pos(0, 0);
if (prompt_interrupted) {
free(line);
line = NULL;
report_clear();
}
prompt_interrupted = false;
last_entry = history_get(history_length);
if (line && *line &&
(!last_entry || strcmp(line, last_entry->line)))
add_history(line);
return line;
}
static const char *
prompt_histfile(void)
{
static char path[SIZEOF_STR] = "";
const char *xdg_data_home = getenv("XDG_DATA_HOME");
const char *home = getenv("HOME");
int fd;
if (!xdg_data_home || !*xdg_data_home) {
if (!string_format(path, "%s/.local/share/tig/history", home))
die("Failed to expand $HOME");
} else if (!string_format(path, "%s/tig/history", xdg_data_home))
die("Failed to expand $XDG_DATA_HOME");
else {
char path_copy[SIZEOF_STR];
strncpy(path_copy, path, SIZEOF_STR);
mkdir(dirname(path_copy), 0777);
}
fd = open(path, O_RDWR | O_CREAT | O_APPEND, 0666);
if (fd > 0)
close(fd);
else if (!string_format(path, "%s/.tig_history", home))
die("Failed to expand $HOME");
return path;
}
static int
history_go_line(int rel_line_num)
{
/* history_set_pos confusingly takes an absolute index. Expose a
* "relative offset" version consistent with the rest of readline.
*/
return history_set_pos(rel_line_num - history_base);
}
static void
prompt_history_dedupe(void)
{
HIST_ENTRY *uniq_entry, *earlier_entry;
int uniq_lineno;
using_history();
uniq_lineno = history_length;
while (uniq_lineno >= history_base) {
history_go_line(uniq_lineno);
uniq_entry = current_history();
if (!uniq_entry)
break;
while ((earlier_entry = previous_history())) {
if (!strcmp(earlier_entry->line, uniq_entry->line)
&& ((earlier_entry = remove_history(where_history())))) {
free_history_entry(earlier_entry);
uniq_lineno--;
}
}
uniq_lineno--;
}
/* defensive hard reset */
using_history();
history_go_line(history_length);
}
static void
prompt_teardown(void)
{
if (opt_history_size <= 0)
return;
prompt_history_dedupe();
write_history(prompt_histfile());
}
void
prompt_init(void)
{
HIST_ENTRY *last_entry;
readline_init();
if (opt_history_size <= 0)
return;
using_history();
stifle_history(opt_history_size);
read_history(prompt_histfile());
if (atexit(prompt_teardown))
die("Failed to register prompt_teardown");
last_entry = history_get(history_length);
if (last_entry)
string_ncopy(argv_env.search, last_entry->line, strlen(last_entry->line));
}
#else
char *
read_prompt(const char *prompt)
{
return read_prompt_incremental(prompt, true, true, NULL, NULL);
}
void
prompt_init(void)
{
}
#endif /* HAVE_READLINE */
bool
prompt_menu(const char *prompt, const struct menu_item *items, int *selected)
{
enum input_status status = INPUT_OK;
char buf[128];
struct key key;
int size = 0;
while (items[size].text)
size++;
assert(size > 0);
curs_set(1);
while (status == INPUT_OK) {
const struct menu_item *item = &items[*selected];
const char hotkey[] = { ' ', '[', (char) item->hotkey, ']', 0 };
int i;
if (!string_format(buf, "(%d of %d)", *selected + 1, size))
buf[0] = 0;
update_status_with_context(buf, "%s %s%s", prompt, item->text,
item->hotkey ? hotkey : "");
switch (get_input(COLS - 1, &key)) {
case KEY_RETURN:
case KEY_ENTER:
case '\n':
status = INPUT_STOP;
break;
case KEY_LEFT:
case KEY_UP:
*selected = *selected - 1;
if (*selected < 0)
*selected = size - 1;
break;
case KEY_RIGHT:
case KEY_DOWN:
*selected = (*selected + 1) % size;
break;
case KEY_ESC:
status = INPUT_CANCEL;
break;
default:
if (key_to_control(&key) == 'C') {
status = INPUT_CANCEL;
break;
}
for (i = 0; items[i].text; i++)
if (items[i].hotkey == key.data.bytes[0]) {
*selected = i;
status = INPUT_STOP;
break;
}
}
}
curs_set(0);
report_clear();
return status != INPUT_CANCEL;
}
static struct option_info option_toggles[] = {
#define DEFINE_OPTION_TOGGLES(name, type, flags) { #name, STRING_SIZE(#name), #type, &opt_ ## name, flags },
OPTION_INFO(DEFINE_OPTION_TOGGLES)
};
static bool
find_arg(const char *argv[], const char *arg)
{
int i;
for (i = 0; argv && argv[i]; i++)
if (!strcmp(argv[i], arg))
return true;
return false;
}
static enum status_code
prompt_toggle_option(struct view *view, const char *argv[], const char *prefix,
struct option_info *toggle, enum view_flag *flags)
{
/* Define a partial version of success() to format the option name as a suffix to the view name,
* thereby reducing the arguments needed by success() to only the option value and its format string.
*/
#define Success(opt_fmt, opt_val) *prefix \
? success(":set %s-view-%s = " opt_fmt, view->name, name, opt_val) \
: success(":set %s = " opt_fmt, name, opt_val)
char name[SIZEOF_STR];
if (!enum_name_prefixed(name, sizeof(name), prefix, toggle->name))
return error("Failed to toggle option %s", toggle->name);
*flags = toggle->flags;
if (!strcmp(toggle->type, "bool")) {
bool *opt = toggle->value;
*opt = !*opt;
if (opt == &opt_mouse)
enable_mouse(*opt);
return Success("%s", *opt ? "yes" : "no");
} else if (!strncmp(toggle->type, "enum", 4)) {
const char *type = toggle->type + STRING_SIZE("enum ");
enum author *opt = toggle->value;
const struct enum_map *map = find_enum_map(type);
*opt = (*opt + 1) % map->size;
return Success("%s", enum_name(map->entries[*opt].name));
} else if (!strcmp(toggle->type, "int")) {
const char *arg = argv[2] ? argv[2] : "1";
int diff = atoi(arg);
int *opt = toggle->value;
if (!diff)
diff = *arg == '-' ? -1 : 1;
if (opt == &opt_diff_context && *opt < 0)
*opt = -*opt;
if (opt == &opt_diff_context && diff < 0) {
if (!*opt)
return error("Diff context cannot be less than zero");
if (*opt < -diff)
diff = -*opt;
}
if (strstr(name, "commit-title-overflow")) {
*opt = *opt ? -*opt : 50;
if (*opt < 0)
return Success("%s", "no");
diff = 0;
}
*opt += diff;
return Success("%d", *opt);
} else if (!strcmp(toggle->type, "double")) {
const char *arg = argv[2] ? argv[2] : "1.0";
double *opt = toggle->value;
int sign = 1;
double diff;
if (*arg == '-') {
sign = -1;
arg++;
}
if (parse_step(&diff, arg) != SUCCESS)
diff = strtod(arg, NULL);
*opt += sign * diff;
return Success("%.2f", *opt);
} else if (!strcmp(toggle->type, "const char **")) {
const char ***opt = toggle->value;
bool found = true;
int i;
if (argv_size(argv) <= 2) {
if (*opt) {
argv_free(*opt);
(*opt)[0] = NULL;
}
return SUCCESS;
}
for (i = 2; argv[i]; i++) {
if (!find_arg(*opt, argv[i])) {
found = false;
break;
}
}
if (found) {
int next, pos;
for (next = 0, pos = 0; (*opt)[pos]; pos++) {
const char *arg = (*opt)[pos];
if (find_arg(argv + 2, arg)) {
free((void *) arg);
continue;
}
(*opt)[next++] = arg;
}
(*opt)[next] = NULL;
} else if (!argv_copy(opt, argv + 2)) {
return ERROR_OUT_OF_MEMORY;
}
return SUCCESS;
} else {
return error("Unsupported `:toggle %s` (%s)", name, toggle->type);
}
#undef Success
}
static enum status_code
prompt_toggle(struct view *view, const char *argv[], enum view_flag *flags)
{
const char *option = argv[1];
size_t optionlen = option ? strlen(option) : 0;
struct option_info template;
struct option_info *toggle;
struct view_column *column;
const char *column_name;
if (!option)
return error("%s", "No option name given to :toggle");
if (enum_equals_static("sort-field", option, optionlen) ||
enum_equals_static("sort-order", option, optionlen)) {
if (!view_has_flags(view, VIEW_SORTABLE)) {
return error("Sorting is not yet supported for the %s view", view->name);
} else {
bool sort_field = enum_equals_static("sort-field", option, optionlen);
struct sort_state *sort = &view->sort;
sort_view(view, sort_field);
return success("set %s = %s", option,
sort_field ? view_column_name(get_sort_field(view))
: sort->reverse ? "descending" : "ascending");
}
}
toggle = find_option_info(option_toggles, ARRAY_SIZE(option_toggles), "", option);
if (toggle)
return prompt_toggle_option(view, argv, "", toggle, flags);
for (column = view->columns; column; column = column->next) {
toggle = find_column_option_info(column->type, &column->opt, option, &template, &column_name);
if (toggle)
return prompt_toggle_option(view, argv, column_name, toggle, flags);
}
return error("`:toggle %s` not supported", option);
}
static void
prompt_update_display(enum view_flag flags)
{
struct view *view;
int i;
if (flags & VIEW_RESET_DISPLAY) {
resize_display();
redraw_display(true);
}
foreach_displayed_view(view, i) {
if (view_has_flags(view, flags) && view_can_refresh(view))
reload_view(view);
else
redraw_view(view);
}
}
enum request
run_prompt_command(struct view *view, const char *argv[])
{
enum request request;
const char *cmd = argv[0];
size_t cmdlen = cmd ? strlen(cmd) : 0;
if (!cmd)
return REQ_NONE;
if (string_isnumber(cmd)) {
int lineno = view->pos.lineno + 1;
if (parse_int(&lineno, cmd, 0, view->lines) == SUCCESS) {
if (!lineno)
lineno = 1;
select_view_line(view, lineno - 1);
report_clear();
} else {
report("Unable to parse '%s' as a line number", cmd);
}
} else if (iscommit(cmd)) {
goto_id(view, cmd, true, true);
return REQ_NONE;
} else if (cmdlen > 1 && (cmd[0] == '/' || cmd[0] == '?')) {
char search[SIZEOF_STR];
if (!argv_to_string(argv, search, sizeof(search), " ")) {
report("Failed to copy search string");
return REQ_NONE;
}
if (!strcmp(search + 1, view->env->search))
return cmd[0] == '/' ? REQ_FIND_NEXT : REQ_FIND_PREV;
string_ncopy(view->env->search, search + 1, strlen(search + 1));
return cmd[0] == '/' ? REQ_FIND_NEXT : REQ_FIND_PREV;
} else if (cmdlen > 1 && cmd[0] == '!') {
struct view *next = &pager_view;
bool copied;
/* Trim the leading '!'. */
argv[0] = cmd + 1;
copied = argv_format(view->env, &next->argv, argv, argv_flag_file_filter | argv_flag_rev_filter);
argv[0] = cmd;
if (!copied) {
report("Argument formatting failed");
} else {
/* When running random commands, initially show the
* command in the title. However, it maybe later be
* overwritten if a commit line is selected. */
argv_to_string(next->argv, next->ref, sizeof(next->ref), " ");
next->dir = NULL;
open_pager_view(view, OPEN_PREPARED | OPEN_WITH_STDERR);
}
} else if (!strcmp(cmd, "goto")) {
if (!argv[1] || !strlen(argv[1]))
report("goto requires an argument");
else
goto_id(view, argv[1], true, true);
return REQ_NONE;
} else if (!strcmp(cmd, "echo")) {
const char **fmt_argv = NULL;
char text[SIZEOF_STR] = "";
if (argv[1]
&& strlen(argv[1]) > 0
&& (!argv_format(view->env, &fmt_argv, &argv[1], argv_flag_file_filter | argv_flag_rev_filter)
|| !argv_to_string(fmt_argv, text, sizeof(text), " ")
)) {
report("Failed to format echo string");
return REQ_NONE;
}
report("%s", text);
return REQ_NONE;
} else if (!strcmp(cmd, "save-display")) {
const char *path = argv[1] ? argv[1] : "tig-display.txt";
if (!save_display(path))
report("Failed to save screen to %s", path);
else
report("Saved screen to %s", path);
} else if (!strcmp(cmd, "save-view")) {
const char *path = argv[1] ? argv[1] : "tig-view.txt";
if (!save_view(view, path))