Display statusline (without formats)

i3bar/src/main.c

@@ -3,6 +3,8 @@
 #include <string.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
 #include <ev.h>
 #include <xcb/xcb.h>
 
@@ -12,6 +14,8 @@
 #include "common.h"
 #include "xcb.h"
 
+#define STDIN_CHUNK_SIZE 1024
+
 void ev_prepare_cb(struct ev_loop *loop, ev_prepare *w, int revents) {
     xcb_flush(xcb_connection);
 }
@@ -27,6 +31,99 @@ void ev_check_cb(struct ev_loop *loop, ev_check *w, int revents) {
 void xcb_io_cb(struct ev_loop *loop, ev_io *w, int revents) {
 }
 
+void start_child(char *command) {
+    int fd[2];
+    pipe(fd);
+    child_pid = fork();
+    switch (child_pid) {
+        case -1:
+            printf("ERROR: Couldn't fork()");
+            exit(EXIT_FAILURE);
+        case 0:
+            close(fd[0]);
+
+            dup2(fd[1], STDOUT_FILENO);
+
+            static const char *shell = NULL;
+
+            if ((shell = getenv("SHELL")) == NULL)
+                shell = "/bin/sh";
+
+            execl(shell, shell, "-c", command, (char*) NULL);
+            break;
+        default:
+            close(fd[1]);
+
+            dup2(fd[0], STDIN_FILENO);
+
+            break;
+    }
+}
+
+void strip_dzen_formats(char *buffer) {
+    char *src = buffer;
+    char *dest = buffer;
+    while (*src != '\0') {
+        if (*src == '^') {
+            if (!strncmp(src, "^ro", strlen("^ro"))) {
+                *(dest++) = ' ';
+                *(dest++) = '|';
+                *(dest++) = ' ';
+            }
+            while (*src != ')') {
+                src++;
+            }
+            src++;
+        } else {
+            *dest = *src;
+            src++;
+            dest++;
+        }
+    }
+    *(--dest) = '\0';
+}
+
+void child_io_cb(struct ev_loop *loop, ev_io *w, int revents) {
+    int fd = w->fd;
+    int n = 0;
+    int rec = 0;
+    int buffer_len = STDIN_CHUNK_SIZE;
+    char *buffer = malloc(buffer_len);
+    memset(buffer, '\0', buffer_len);
+    while(1) {
+        n = read(fd, buffer + rec, buffer_len - rec);
+        if (n == -1) {
+            if (errno == EAGAIN) {
+                break;
+            }
+            printf("ERROR: read() failed!");
+            exit(EXIT_FAILURE);
+        }
+        if (n == 0) {
+            if (rec == buffer_len) {
+                char *tmp = buffer;
+                buffer = malloc(buffer_len + STDIN_CHUNK_SIZE);
+                memset(buffer, '\0', buffer_len);
+                strncpy(buffer, tmp, buffer_len);
+                buffer_len += STDIN_CHUNK_SIZE;
+                FREE(tmp);
+            } else {
+                break;
+            }
+        }
+        rec += n;
+    }
+    if (strlen(buffer) == 0) {
+        FREE(buffer);
+        return;
+    }
+    strip_dzen_formats(buffer);
+    FREE(statusline);
+    statusline = buffer;
+    printf("%s", buffer);
+    draw_bars();
+}
+
 int main(int argc, char **argv) {
     main_loop = ev_default_loop(0);
 
@@ -50,6 +147,13 @@ int main(int argc, char **argv) {
     i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
     i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
 
+    start_child("i3status");
+
+    fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);
+    ev_io *child_io = malloc(sizeof(ev_io));
+    ev_io_init(child_io, &child_io_cb, STDIN_FILENO, EV_READ);
+    ev_io_start(main_loop, child_io);
+
     ev_loop(main_loop, 0);
 
     ev_prepare_stop(main_loop, ev_prep);