Add FIFO documentation, add more funcs

docs/docs.md

@@ -740,6 +740,29 @@ background color.
 
 **Note: Background colors will used until a reset sequence is found.**
 
+## FIFO
+
+spmenu has support for FIFO. This means you can tell spmenu to perform certain
+actions while it is running. spmenu checks the FIFO every 0.1 seconds. To use it,
+simply append a valid name to the FIFO file, which by default is /tmp/spmenu.fifo.
+
+You must append **without** a newline. Otherwise it will be considered invalid.
+It is recommended that you sleep for 0.1 seconds after appending to the file
+for performance reasons.
+
+| Name               | Description                                                                       |
+| :----------------- | :-------------------------------------------------------------------------------- |
+| drawmenu           | Draw the menu                                                                     |
+| match              | Match entries again, useful if you're loading items from file                     |
+| update             | Match and then draw the menu. Both drawmenu and match one after another           |
+| output             | Output selected item text                                                         |
+| output_index       | Output selected item index
+| loadconfig         | Reload config                                                                     |
+| test               | Print out 'Test print' to standard output                                         |
+| die                | Print out 'FIFO told me to die.' using the die() function                         |
+| exit_0             | Exit with exit code 0                                                             |
+| exit_1             | Exit with exit code 1                                                             |
+
 ## Pango markup and text formatting
 
 Because spmenu uses Pango and Cairo for text drawing, Pango markup can be used

libs/fifo.c

@@ -35,6 +35,22 @@ void execute_fifo_cmd(void) {
     } else if (!strcmp(fifot, "die")) {
         close(fd);
         die("FIFO told me to die.");
+    } else if (!strcmp(fifot, "loadconfig")) {
+#if CONFIG
+        conf_init();
+#endif
+    } else if (!strcmp(fifot, "output")) {
+        if (selecteditem) {
+            for (int i = 0; i < sel_size; i++) {
+                if (sel_index[i] != -1 && (!selecteditem || selecteditem->index != sel_index[i])) {
+                    puts(items[sel_index[i]].text);
+                }
+            }
+        }
+    } else if (!strcmp(fifot, "output_index")) {
+        if (printindex && selecteditem) {
+            fprintf(stdout, "%d\n", selecteditem->index);
+        }
     } else if (!strcmp(fifot, "exit_0")) {
         exit(0);
     } else if (!strcmp(fifot, "exit_1")) {

spmenu.1

@@ -860,6 +860,81 @@ foreground and background color.
 .PP
 \f[B]Note: Background colors will used until a reset sequence is
 found.\f[R]
+.SS FIFO
+.PP
+spmenu has support for FIFO.
+This means you can tell spmenu to perform certain actions while it is
+running.
+spmenu checks the FIFO every 0.1 seconds.
+To use it, simply append a valid name to the FIFO file, which by default
+is /tmp/spmenu.fifo.
+.PP
+You must append \f[B]without\f[R] a newline.
+Otherwise it will be considered invalid.
+It is recommended that you sleep for 0.1 seconds after appending to the
+file for performance reasons.
+.PP
+.TS
+tab(@);
+lw(12.7n) lw(57.3n).
+T{
+Name
+T}@T{
+Description
+T}
+_
+T{
+drawmenu
+T}@T{
+Draw the menu
+T}
+T{
+match
+T}@T{
+Match entries again, useful if you\[cq]re loading items from file
+T}
+T{
+update
+T}@T{
+Match and then draw the menu.
+Both drawmenu and match one after another
+T}
+T{
+output
+T}@T{
+Output selected item text
+T}
+T{
+output_index
+T}@T{
+Output selected item index
+T}
+T{
+loadconfig
+T}@T{
+Reload config
+T}
+T{
+test
+T}@T{
+Print out `Test print' to standard output
+T}
+T{
+die
+T}@T{
+Print out `FIFO told me to die.' using the die() function
+T}
+T{
+exit_0
+T}@T{
+Exit with exit code 0
+T}
+T{
+exit_1
+T}@T{
+Exit with exit code 1
+T}
+.TE
 .SS Pango markup and text formatting
 .PP
 Because spmenu uses Pango and Cairo for text drawing, Pango markup can