sway/sway/criteria.c
2015-11-25 14:59:07 +01:00

350 lines
9.2 KiB
C

#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <regex.h>
#include "criteria.h"
#include "stringop.h"
#include "list.h"
#include "log.h"
#include "container.h"
#include "config.h"
enum criteria_type { // *must* keep in sync with criteria_strings[]
CRIT_CLASS,
CRIT_ID,
CRIT_INSTANCE,
CRIT_TITLE,
CRIT_URGENT,
CRIT_WINDOW_ROLE,
CRIT_WINDOW_TYPE,
CRIT_WORKSPACE,
CRIT_LAST
};
// this *must* match the ordering in criteria_type enum
static const char * const criteria_strings[] = {
"class",
"id",
"instance",
"title",
"urgent", // either "latest" or "oldest" ...
"window_role",
"window_type",
"workspace"
};
/**
* A single criteria token (ie. value/regex pair),
* e.g. 'class="some class regex"'.
*/
struct crit_token {
enum criteria_type type;
regex_t *regex;
char *raw;
};
static void free_crit_token(struct crit_token *crit) {
if (crit->regex) {
regfree(crit->regex);
free(crit->regex);
}
if (crit->raw) {
free(crit->raw);
}
free(crit);
}
static void free_crit_tokens(list_t *crit_tokens) {
for (int i = 0; i < crit_tokens->length; i++) {
free_crit_token(crit_tokens->items[i]);
}
list_free(crit_tokens);
}
// Extracts criteria string from its brackets. Returns new (duplicate)
// substring.
static char *criteria_from(const char *arg) {
char *criteria = NULL;
if (*arg == '[') {
criteria = strdup(arg + 1);
} else {
criteria = strdup(arg);
}
int last = strlen(criteria) - 1;
if (criteria[last] == ']') {
criteria[last] = '\0';
}
return criteria;
}
// Return instances of c found in str.
static int countchr(char *str, char c) {
int found = 0;
for (int i = 0; str[i]; i++) {
if (str[i] == c) {
++found;
}
}
return found;
}
// criteria_str is e.g. '[class="some class regex" instance="instance name"]'.
//
// Will create array of pointers in buf, where first is duplicate of given
// string (must be freed) and the rest are pointers to names and values in the
// base string (every other, naturally). argc will be populated with the length
// of buf.
//
// Returns error string or NULL if successful.
static char *crit_tokens(int *argc, char ***buf, const char * const criteria_str) {
sway_log(L_DEBUG, "Parsing criteria: '%s'", criteria_str);
char *base = criteria_from(criteria_str);
char *head = base;
char *namep = head; // start of criteria name
char *valp = NULL; // start of value
// We're going to place EOS markers where we need to and fill up an array
// of pointers to the start of each token (either name or value).
int pairs = countchr(base, '=');
int max_tokens = pairs * 2 + 1; // this gives us at least enough slots
char **argv = *buf = calloc(max_tokens, sizeof(char*));
argv[0] = base; // this needs to be freed by caller
*argc = 1; // uneven = name, even = value
while (*head && *argc < max_tokens) {
if (namep != head && *(head - 1) == '\\') {
// escaped character: don't try to parse this
} else if (*head == '=' && namep != head) {
if (*argc % 2 != 1) {
// we're not expecting a name
return strdup("Unable to parse criteria: "
"Found out of place equal sign");
} else {
// name ends here
char *end = head; // don't want to rewind the head
while (*(end - 1) == ' ') {
--end;
}
*end = '\0';
if (*(namep) == ' ') {
namep = strrchr(namep, ' ') + 1;
}
argv[(*argc)++] = namep;
}
} else if (*head == '"') {
if (*argc % 2 != 0) {
// we're not expecting a value
return strdup("Unable to parse criteria: "
"Found quoted value where it was not expected");
} else if (!valp) { // value starts here
valp = head + 1;
} else {
// value ends here
argv[(*argc)++] = valp;
*head = '\0';
valp = NULL;
namep = head + 1;
}
} else if (*argc % 2 == 0 && !valp && *head != ' ') {
// We're expecting a quoted value, haven't found one yet, and this
// is not an empty space.
return strdup("Unable to parse criteria: "
"Names must be unquoted, values must be quoted");
}
head++;
}
return NULL;
}
// Returns error string on failure or NULL otherwise.
static char *parse_criteria_name(enum criteria_type *type, char *name) {
*type = CRIT_LAST;
for (int i = 0; i < CRIT_LAST; i++) {
if (strcmp(criteria_strings[i], name) == 0) {
*type = (enum criteria_type) i;
break;
}
}
if (*type == CRIT_LAST) {
const char *fmt = "Criteria type '%s' is invalid or unsupported.";
int len = strlen(name) + strlen(fmt) - 1;
char *error = malloc(len);
snprintf(error, len, fmt, name);
return error;
} else if (*type == CRIT_INSTANCE || *type == CRIT_URGENT ||
*type == CRIT_WINDOW_ROLE || *type == CRIT_WINDOW_TYPE) {
// (we're just being helpful here)
const char *fmt = "\"%s\" criteria currently unsupported, "
"no window will match this";
int len = strlen(fmt) + strlen(name) - 1;
char *error = malloc(len);
snprintf(error, len, fmt, name);
return error;
}
return NULL;
}
// Returns error string on failure or NULL otherwise.
static char *generate_regex(regex_t **regex, char *value) {
*regex = calloc(1, sizeof(regex_t));
int err = regcomp(*regex, value, REG_NOSUB);
if (err != 0) {
char *reg_err = malloc(64);
regerror(err, *regex, reg_err, 64);
const char *fmt = "Regex compilation (for '%s') failed: %s";
int len = strlen(fmt) + strlen(value) + strlen(reg_err) - 3;
char *error = malloc(len);
snprintf(error, len, fmt, value, reg_err);
free(reg_err);
return error;
}
return NULL;
}
// Pouplate list with crit_tokens extracted from criteria string, returns error
// string or NULL if successful.
char *extract_crit_tokens(list_t *tokens, const char * const criteria) {
int argc;
char **argv = NULL, *error = NULL;
if ((error = crit_tokens(&argc, &argv, criteria))) {
goto ect_cleanup;
}
for (int i = 1; i + 1 < argc; i += 2) {
char* name = argv[i], *value = argv[i + 1];
struct crit_token *token = calloc(1, sizeof(struct crit_token));
token->raw = strdup(value);
if ((error = parse_criteria_name(&token->type, name))) {
free_crit_token(token);
goto ect_cleanup;
} else if (token->type == CRIT_URGENT || strcmp(value, "focused") == 0) {
sway_log(L_DEBUG, "%s -> \"%s\"", name, value);
list_add(tokens, token);
} else if((error = generate_regex(&token->regex, value))) {
free_crit_token(token);
goto ect_cleanup;
} else {
sway_log(L_DEBUG, "%s -> /%s/", name, value);
list_add(tokens, token);
}
}
ect_cleanup:
free(argv[0]); // base string
free(argv);
return error;
}
// test a single view if it matches list of criteria tokens (all of them).
static bool criteria_test(swayc_t *cont, list_t *tokens) {
if (cont->type != C_VIEW) {
return false;
}
int matches = 0;
for (int i = 0; i < tokens->length; i++) {
struct crit_token *crit = tokens->items[i];
switch (crit->type) {
case CRIT_CLASS:
if (!cont->class) {
// ignore
} else if (strcmp(crit->raw, "focused") == 0) {
swayc_t *focused = get_focused_view(&root_container);
if (focused->class && strcmp(cont->class, focused->class) == 0) {
matches++;
}
} else if (crit->regex && regexec(crit->regex, cont->class, 0, NULL, 0) == 0) {
matches++;
}
break;
case CRIT_ID:
if (!cont->app_id) {
// ignore
} else if (crit->regex && regexec(crit->regex, cont->app_id, 0, NULL, 0) == 0) {
matches++;
}
break;
case CRIT_INSTANCE:
break;
case CRIT_TITLE:
if (!cont->name) {
// ignore
} else if (strcmp(crit->raw, "focused") == 0) {
swayc_t *focused = get_focused_view(&root_container);
if (focused->name && strcmp(cont->name, focused->name) == 0) {
matches++;
}
} else if (crit->regex && regexec(crit->regex, cont->name, 0, NULL, 0) == 0) {
matches++;
}
break;
case CRIT_URGENT: // "latest" or "oldest"
break;
case CRIT_WINDOW_ROLE:
break;
case CRIT_WINDOW_TYPE:
// TODO wlc indeed exposes this information
break;
case CRIT_WORKSPACE: ;
swayc_t *cont_ws = swayc_parent_by_type(cont, C_WORKSPACE);
if (!cont_ws || !cont_ws->name) {
// ignore
} else if (strcmp(crit->raw, "focused") == 0) {
swayc_t *focused_ws = swayc_active_workspace();
if (focused_ws->name && strcmp(cont_ws->name, focused_ws->name) == 0) {
matches++;
}
} else if (crit->regex && regexec(crit->regex, cont_ws->name, 0, NULL, 0) == 0) {
matches++;
}
break;
default:
sway_abort("Invalid criteria type (%i)", crit->type);
break;
}
}
return matches == tokens->length;
}
int criteria_cmp(const void *a, const void *b) {
if (a == b) {
return 0;
} else if (!a) {
return -1;
} else if (!b) {
return 1;
}
const struct criteria *crit_a = a, *crit_b = b;
int cmp = lenient_strcmp(crit_a->cmdlist, crit_b->cmdlist);
if (cmp != 0) {
return cmp;
}
return lenient_strcmp(crit_a->crit_raw, crit_b->crit_raw);
}
void free_criteria(struct criteria *crit) {
if (crit->tokens) {
free_crit_tokens(crit->tokens);
}
if (crit->cmdlist) {
free(crit->cmdlist);
}
if (crit->crit_raw) {
free(crit->crit_raw);
}
free(crit);
}
list_t *criteria_for(swayc_t *cont) {
list_t *criteria = config->criteria, *matches = create_list();
for (int i = 0; i < criteria->length; i++) {
struct criteria *bc = criteria->items[i];
if (criteria_test(cont, bc->tokens)) {
list_add(matches, bc);
}
}
return matches;
}