sway/swaybar/status_line.c

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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <json-c/json.h>
#include "log.h"
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#include "bar/config.h"
#include "bar/status_line.h"
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#define I3JSON_MAXDEPTH 4
#define I3JSON_UNKNOWN 0
#define I3JSON_ARRAY 1
#define I3JSON_STRING 2
struct {
int bufsize;
char *buffer;
char *line_start;
char *parserpos;
bool escape;
int depth;
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int bar[I3JSON_MAXDEPTH+1];
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} i3json_state = { 0, NULL, NULL, NULL, false, 0, { I3JSON_UNKNOWN } };
static char line[1024];
static char line_rest[1024];
static void free_status_block(void *item) {
if (!item) {
return;
}
struct status_block *sb = (struct status_block*)item;
if (sb->full_text) {
free(sb->full_text);
}
if (sb->short_text) {
free(sb->short_text);
}
if (sb->align) {
free(sb->align);
}
if (sb->name) {
free(sb->name);
}
if (sb->instance) {
free(sb->instance);
}
free(sb);
}
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static void parse_json(struct bar *bar, const char *text) {
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json_object *results = json_tokener_parse(text);
if (!results) {
sway_log(L_DEBUG, "Failed to parse json");
return;
}
if (json_object_array_length(results) < 1) {
return;
}
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if (bar->status->block_line) {
list_foreach(bar->status->block_line, free_status_block);
list_free(bar->status->block_line);
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}
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bar->status->block_line = create_list();
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int i;
for (i = 0; i < json_object_array_length(results); ++i) {
json_object *full_text, *short_text, *color, *min_width, *align, *urgent;
json_object *name, *instance, *separator, *separator_block_width;
json_object *background, *border, *border_top, *border_bottom;
json_object *border_left, *border_right;
json_object *json = json_object_array_get_idx(results, i);
if (!json) {
continue;
}
json_object_object_get_ex(json, "full_text", &full_text);
json_object_object_get_ex(json, "short_text", &short_text);
json_object_object_get_ex(json, "color", &color);
json_object_object_get_ex(json, "min_width", &min_width);
json_object_object_get_ex(json, "align", &align);
json_object_object_get_ex(json, "urgent", &urgent);
json_object_object_get_ex(json, "name", &name);
json_object_object_get_ex(json, "instance", &instance);
json_object_object_get_ex(json, "separator", &separator);
json_object_object_get_ex(json, "separator_block_width", &separator_block_width);
json_object_object_get_ex(json, "background", &background);
json_object_object_get_ex(json, "border", &border);
json_object_object_get_ex(json, "border_top", &border_top);
json_object_object_get_ex(json, "border_bottom", &border_bottom);
json_object_object_get_ex(json, "border_left", &border_left);
json_object_object_get_ex(json, "border_right", &border_right);
struct status_block *new = calloc(1, sizeof(struct status_block));
if (full_text) {
new->full_text = strdup(json_object_get_string(full_text));
}
if (short_text) {
new->short_text = strdup(json_object_get_string(short_text));
}
if (color) {
new->color = parse_color(json_object_get_string(color));
} else {
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new->color = bar->config->colors.statusline;
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}
if (min_width) {
json_type type = json_object_get_type(min_width);
if (type == json_type_int) {
new->min_width = json_object_get_int(min_width);
} else if (type == json_type_string) {
/* the width will be calculated when rendering */
new->min_width = 0;
}
}
if (align) {
new->align = strdup(json_object_get_string(align));
} else {
new->align = strdup("left");
}
if (urgent) {
new->urgent = json_object_get_int(urgent);
}
if (name) {
new->name = strdup(json_object_get_string(name));
}
if (instance) {
new->instance = strdup(json_object_get_string(instance));
}
if (separator) {
new->separator = json_object_get_int(separator);
} else {
new->separator = true; // i3bar spec
}
if (separator_block_width) {
new->separator_block_width = json_object_get_int(separator_block_width);
} else {
new->separator_block_width = 9; // i3bar spec
}
// Airblader features
if (background) {
new->background = parse_color(json_object_get_string(background));
} else {
new->background = 0x0; // transparent
}
if (border) {
new->border = parse_color(json_object_get_string(border));
} else {
new->border = 0x0; // transparent
}
if (border_top) {
new->border_top = json_object_get_int(border_top);
} else {
new->border_top = 1;
}
if (border_bottom) {
new->border_bottom = json_object_get_int(border_bottom);
} else {
new->border_bottom = 1;
}
if (border_left) {
new->border_left = json_object_get_int(border_left);
} else {
new->border_left = 1;
}
if (border_right) {
new->border_right = json_object_get_int(border_right);
} else {
new->border_right = 1;
}
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list_add(bar->status->block_line, new);
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}
json_object_put(results);
}
// continue parsing from last parserpos
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static int i3json_parse(struct bar *bar) {
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char *c = i3json_state.parserpos;
int handled = 0;
while (*c) {
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if (i3json_state.bar[i3json_state.depth] == I3JSON_STRING) {
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if (!i3json_state.escape && *c == '"') {
--i3json_state.depth;
}
i3json_state.escape = !i3json_state.escape && *c == '\\';
} else {
switch (*c) {
case '[':
++i3json_state.depth;
if (i3json_state.depth > I3JSON_MAXDEPTH) {
sway_abort("JSON too deep");
}
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i3json_state.bar[i3json_state.depth] = I3JSON_ARRAY;
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if (i3json_state.depth == 2) {
i3json_state.line_start = c;
}
break;
case ']':
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if (i3json_state.bar[i3json_state.depth] != I3JSON_ARRAY) {
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sway_abort("JSON malformed");
}
--i3json_state.depth;
if (i3json_state.depth == 1) {
// c[1] is valid since c[0] != '\0'
char p = c[1];
c[1] = '\0';
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parse_json(bar, i3json_state.line_start);
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c[1] = p;
++handled;
i3json_state.line_start = c+1;
}
break;
case '"':
++i3json_state.depth;
if (i3json_state.depth > I3JSON_MAXDEPTH) {
sway_abort("JSON too deep");
}
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i3json_state.bar[i3json_state.depth] = I3JSON_STRING;
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break;
}
}
++c;
}
i3json_state.parserpos = c;
return handled;
}
// Read line from file descriptor, only show the line tail if it is too long.
// In non-blocking mode treat "no more data" as a linebreak.
// If data after a line break has been read, return it in rest.
// If rest is non-empty, then use that as the start of the next line.
static int read_line_tail(int fd, char *buf, int nbyte, char *rest) {
if (fd < 0 || !buf || !nbyte) {
return -1;
}
int l;
char *buffer = malloc(nbyte*2+1);
char *readpos = buffer;
char *lf;
// prepend old data to new line if necessary
if (rest) {
l = strlen(rest);
if (l > nbyte) {
strcpy(buffer, rest + l - nbyte);
readpos += nbyte;
} else if (l) {
strcpy(buffer, rest);
readpos += l;
}
}
// read until a linefeed is found or no more data is available
while ((l = read(fd, readpos, nbyte)) > 0) {
readpos[l] = '\0';
lf = strchr(readpos, '\n');
if (lf) {
// linefeed found, replace with \0
*lf = '\0';
// give data from the end of the line, try to fill the buffer
if (lf-buffer > nbyte) {
strcpy(buf, lf - nbyte + 1);
} else {
strcpy(buf, buffer);
}
// we may have read data from the next line, save it to rest
if (rest) {
rest[0] = '\0';
strcpy(rest, lf + 1);
}
free(buffer);
return strlen(buf);
} else {
// no linefeed found, slide data back.
int overflow = readpos - buffer + l - nbyte;
if (overflow > 0) {
memmove(buffer, buffer + overflow , nbyte + 1);
}
}
}
if (l < 0) {
free(buffer);
return l;
}
readpos[l]='\0';
if (rest) {
rest[0] = '\0';
}
if (nbyte < readpos - buffer + l - 1) {
memcpy(buf, readpos - nbyte + l + 1, nbyte);
} else {
strncpy(buf, buffer, nbyte);
}
buf[nbyte-1] = '\0';
free(buffer);
return strlen(buf);
}
// make sure that enough buffer space is available starting from parserpos
static void i3json_ensure_free(int min_free) {
int _step = 10240;
int r = min_free % _step;
if (r) {
min_free += _step - r;
}
if (!i3json_state.buffer) {
i3json_state.buffer = malloc(min_free);
i3json_state.bufsize = min_free;
i3json_state.parserpos = i3json_state.buffer;
} else {
int len = 0;
int pos = 0;
if (i3json_state.line_start) {
len = strlen(i3json_state.line_start);
pos = i3json_state.parserpos - i3json_state.line_start;
if (i3json_state.line_start != i3json_state.buffer) {
memmove(i3json_state.buffer, i3json_state.line_start, len+1);
}
} else {
len = strlen(i3json_state.buffer);
}
if (i3json_state.bufsize < len+min_free) {
i3json_state.bufsize += min_free;
if (i3json_state.bufsize > 1024000) {
sway_abort("Status line json too long or malformed.");
}
i3json_state.buffer = realloc(i3json_state.buffer, i3json_state.bufsize);
if (!i3json_state.buffer) {
sway_abort("Could not allocate json buffer");
}
}
if (i3json_state.line_start) {
i3json_state.line_start = i3json_state.buffer;
i3json_state.parserpos = i3json_state.buffer + pos;
} else {
i3json_state.parserpos = i3json_state.buffer;
}
}
if (!i3json_state.buffer) {
sway_abort("Could not allocate buffer.");
}
}
// append data and parse it.
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static int i3json_handle_data(struct bar *bar, char *data) {
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int len = strlen(data);
i3json_ensure_free(len);
strcpy(i3json_state.parserpos, data);
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return i3json_parse(bar);
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}
// read data from fd and parse it.
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static int i3json_handle_fd(struct bar *bar) {
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i3json_ensure_free(10240);
// get fresh data at the end of the buffer
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int readlen = read(bar->status_read_fd, i3json_state.parserpos, 10239);
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if (readlen < 0) {
return readlen;
}
i3json_state.parserpos[readlen] = '\0';
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return i3json_parse(bar);
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}
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bool handle_status_line(struct bar *bar) {
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bool dirty = false;
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switch (bar->status->protocol) {
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case I3BAR:
sway_log(L_DEBUG, "Got i3bar protocol.");
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if (i3json_handle_fd(bar) > 0) {
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dirty = true;
}
break;
case TEXT:
sway_log(L_DEBUG, "Got text protocol.");
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read_line_tail(bar->status_read_fd, line, sizeof(line), line_rest);
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dirty = true;
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bar->status->text_line = line;
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break;
case UNDEF:
sway_log(L_DEBUG, "Detecting protocol...");
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if (read_line_tail(bar->status_read_fd, line, sizeof(line), line_rest) < 0) {
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break;
}
dirty = true;
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bar->status->text_line = line;
bar->status->protocol = TEXT;
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if (line[0] == '{') {
// detect i3bar json protocol
json_object *proto = json_tokener_parse(line);
json_object *version;
if (proto) {
if (json_object_object_get_ex(proto, "version", &version)
&& json_object_get_int(version) == 1
) {
sway_log(L_DEBUG, "Switched to i3bar protocol.");
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bar->status->protocol = I3BAR;
i3json_handle_data(bar, line_rest);
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}
json_object_put(proto);
}
}
break;
}
return dirty;
}
struct status_line *init_status_line() {
struct status_line *line = malloc(sizeof(struct status_line));
line->block_line = create_list();
line->text_line = NULL;
line->protocol = UNDEF;
return line;
}
void free_status_line(struct status_line *line) {
if (line->block_line) {
list_foreach(line->block_line, free_status_block);
list_free(line->block_line);
}
}