Merge pull request #467 from mikkeloscar/swaybar-refactor

[WIP] Swaybar refactor

1 files changed, 442 insertions, 0 deletions

diff --git a/swaybar/status_line.c b/swaybar/status_line.c
new file mode 100644
index 00000000..6b630c49
--- /dev/null
+++ b/swaybar/status_line.c
@@ -0,0 +1,442 @@
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <json-c/json.h>
+
+#include "log.h"
+#include "config.h"
+#include "status_line.h"
+
+#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;
+	int bar[I3JSON_MAXDEPTH+1];
+} 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);
+}
+
+static void parse_json(struct bar *bar, const char *text) {
+	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;
+	}
+
+	if (bar->status->block_line) {
+		list_foreach(bar->status->block_line, free_status_block);
+		list_free(bar->status->block_line);
+	}
+
+	bar->status->block_line = create_list();
+
+	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 {
+			new->color = bar->config->colors.statusline;
+		}
+
+		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;
+		}
+
+		list_add(bar->status->block_line, new);
+	}
+
+	json_object_put(results);
+}
+
+// continue parsing from last parserpos
+static int i3json_parse(struct bar *bar) {
+	char *c = i3json_state.parserpos;
+	int handled = 0;
+	while (*c) {
+		if (i3json_state.bar[i3json_state.depth] == I3JSON_STRING) {
+			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");
+				}
+				i3json_state.bar[i3json_state.depth] = I3JSON_ARRAY;
+				if (i3json_state.depth == 2) {
+					i3json_state.line_start = c;
+				}
+				break;
+			case ']':
+				if (i3json_state.bar[i3json_state.depth] != I3JSON_ARRAY) {
+					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';
+					parse_json(bar, i3json_state.line_start);
+					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");
+				}
+				i3json_state.bar[i3json_state.depth] = I3JSON_STRING;
+				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.
+static int i3json_handle_data(struct bar *bar, char *data) {
+	int len = strlen(data);
+	i3json_ensure_free(len);
+	strcpy(i3json_state.parserpos, data);
+	return i3json_parse(bar);
+}
+
+// read data from fd and parse it.
+static int i3json_handle_fd(struct bar *bar) {
+	i3json_ensure_free(10240);
+	// get fresh data at the end of the buffer
+	int readlen = read(bar->status_read_fd, i3json_state.parserpos, 10239);
+	if (readlen < 0) {
+		return readlen;
+	}
+	i3json_state.parserpos[readlen] = '\0';
+	return i3json_parse(bar);
+}
+
+bool handle_status_line(struct bar *bar) {
+	bool dirty = false;
+
+	switch (bar->status->protocol) {
+	case I3BAR:
+		sway_log(L_DEBUG, "Got i3bar protocol.");
+		if (i3json_handle_fd(bar) > 0) {
+			dirty = true;
+		}
+		break;
+	case TEXT:
+		sway_log(L_DEBUG, "Got text protocol.");
+		read_line_tail(bar->status_read_fd, line, sizeof(line), line_rest);
+		dirty = true;
+		bar->status->text_line = line;
+		break;
+	case UNDEF:
+		sway_log(L_DEBUG, "Detecting protocol...");
+		if (read_line_tail(bar->status_read_fd, line, sizeof(line), line_rest) < 0) {
+			break;
+		}
+		dirty = true;
+		bar->status->text_line = line;
+		bar->status->protocol = TEXT;
+		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.");
+					bar->status->protocol = I3BAR;
+					i3json_handle_data(bar, line_rest);
+				}
+				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);
+	}
+}