Implement status line

Does not yet support i3bar json protocol

swaybar/status_line.c

@@ -0,0 +1,78 @@
+#define _POSIX_C_SOURCE
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <wlr/util/log.h>
+#include "swaybar/config.h"
+#include "swaybar/status_line.h"
+#include "readline.h"
+
+bool handle_status_readable(struct status_line *status) {
+	char *line = read_line_buffer(status->read,
+			status->buffer, status->buffer_size);
+	switch (status->protocol) {
+	case PROTOCOL_I3BAR:
+		// TODO
+		break;
+	case PROTOCOL_TEXT:
+		status->text = line;
+		return true;
+	case PROTOCOL_UNDEF:
+		if (!line) {
+			return false;
+		}
+		if (line[0] == '{') {
+			// TODO: JSON
+		} else {
+			status->text = line;
+			status->protocol = PROTOCOL_TEXT;
+		}
+		return false;
+	}
+	return false;
+}
+
+struct status_line *status_line_init(char *cmd) {
+	struct status_line *status = calloc(1, sizeof(struct status_line));
+	status->buffer_size = 4096;
+	status->buffer = malloc(status->buffer_size);
+
+	int pipe_read_fd[2];
+	int pipe_write_fd[2];
+	if (pipe(pipe_read_fd) != 0 || pipe(pipe_write_fd) != 0) {
+		wlr_log(L_ERROR, "Unable to create pipes for status_command fork");
+		exit(1);
+	}
+
+	status->pid = fork();
+	if (status->pid == 0) {
+		dup2(pipe_read_fd[1], STDOUT_FILENO);
+		close(pipe_read_fd[0]);
+		close(pipe_read_fd[1]);
+
+		dup2(pipe_write_fd[0], STDIN_FILENO);
+		close(pipe_write_fd[0]);
+		close(pipe_write_fd[1]);
+
+		char *const _cmd[] = { "sh", "-c", cmd, NULL, };
+		execvp(_cmd[0], _cmd);
+		exit(1);
+	}
+
+	close(pipe_read_fd[1]);
+	status->read_fd = pipe_read_fd[0];
+	fcntl(status->read_fd, F_SETFL, O_NONBLOCK);
+	close(pipe_write_fd[0]);
+	status->write_fd = pipe_write_fd[1];
+	fcntl(status->write_fd, F_SETFL, O_NONBLOCK);
+
+	status->read = fdopen(status->read_fd, "r");
+	status->write = fdopen(status->write_fd, "w");
+	return status;
+}
+
+void status_line_free(struct status_line *line) {
+	free(line);
+}