Add basic FIFO

README.md

@@ -16,6 +16,7 @@ can be themed to look identical to dmenu.
 - Reading entries from standard input and file
 - Image and icon support
 - Run launcher, supporting both .desktop entries and $PATH
+- FIFO, allowing programs to communicate with spmenu
 - fzf-like Fuzzy matching
 - Vi-like modes (see docs/binds-vim.conf)
 - History buffer

libs/fifo.c

@@ -0,0 +1,60 @@
+/* See LICENSE file for copyright and license details. */
+
+#if FIFO
+static void init_fifo(void);
+static void execute_fifo_cmd(void);
+static int done = 1;
+
+void execute_fifo_cmd(void) {
+    int fd;
+    char fifot[BUFSIZ];
+
+    done = 0;
+
+    fd = open(fifofile, O_RDONLY);
+    int r = read(fd, fifot, sizeof(fifot));
+
+    if (!r) {
+        close(fd);
+        return;
+    }
+
+    if (!strcmp(fifot, "drawmenu")) {
+        drawmenu();
+    } else if (!strcmp(fifot, "match")) {
+        match();
+    } else if (!strcmp(fifot, "test")) {
+        fprintf(stderr, "Test print\n");
+    } else if (!strcmp(fifot, "die")) {
+        close(fd);
+        die("FIFO told me to die.");
+    } else if (!strcmp(fifot, "exit_0")) {
+        exit(0);
+    } else if (!strcmp(fifot, "exit_1")) {
+        exit(1);
+    } else {
+        fprintf(stderr, "spmenu: Unknown command: %s\n", fifot);
+    }
+
+    close(fd);
+
+    done = 1;
+}
+
+void *fifocmd(void *n) {
+    for (;;) {
+        sleep(1);
+
+        if (done) {
+            execute_fifo_cmd();
+        }
+    }
+}
+
+void init_fifo(void) {
+    mkfifo(fifofile, 0666);
+
+    pthread_t tid;
+    pthread_create(&tid, NULL, &fifocmd, NULL);
+}
+#endif

libs/options.h

@@ -60,6 +60,9 @@ static int generatecache               = 1; /* Generate image cache by default *
 static int maxcache                    = 512; /* Max image size to cache */
 static char *cachedir                  = "default"; /* Cache directory. Default means spmenu will determine automatically */
 
+/* Fifo options */
+static char *fifofile                  = "/tmp/spmenu.fifo"; /* spmenu FIFO path */
+
 /* Screenshot options */
 static char *screenshotfile            = NULL; /* Screenshot file path. If set to NULL, the default path will be used. */
 static char *screenshotname            = NULL; /* Screenshot file name. If set to NULL, the default name will be used. */

meson.build

@@ -86,6 +86,10 @@ if get_option('regex')
   build_args += [ '-DREGEX' ]
 endif
 
+if get_option('fifo')
+  build_args += [ '-DFIFO' ]
+endif
+
 project_target = executable(
   meson.project_name(),
   project_source_files, install : true,

meson_options.txt

@@ -7,6 +7,7 @@ option('xresources', type : 'boolean', value : true, description : 'Enable .Xres
 option('fribidi',    type : 'boolean', value : true, description : 'Enable Right-to-left language support')
 option('libconfig',  type : 'boolean', value : true, description : 'Enable configuration file support')
 option('regex',      type : 'boolean', value : true, description : 'Enable regex matching')
+option('fifo',       type : 'boolean', value : true, description : 'Enable FIFO')
 option('run',        type : 'boolean', value : true, description : 'Install spmenu_run')
 option('test',       type : 'boolean', value : true, description : 'Install spmenu_test')
 option('man',        type : 'boolean', value : true, description : 'Install man page')

packaging/spmenu.ebuild

@@ -17,7 +17,7 @@ fi
 
 LICENSE="MIT"
 SLOT="0"
-IUSE="+X +wayland +imlib2 +ssl +regex +fribidi +config +xinerama +xrdb +doc +run +test +man"
+IUSE="+X +wayland +imlib2 +ssl +regex +fribidi +config +xinerama +xrdb +fifo +doc +run +test +man"
 REQUIRED_USE="
 	!wayland? ( X )
 	!X? ( wayland )

scripts/spmenu_make

@@ -10,6 +10,7 @@ xresources=${xresources:-true}
 wayland=${wayland:-true}
 x11=${x11:-true}
 regex=${regex:-true}
+fifo=${fifo:-true}
 
 prefix="${prefix:-/usr}"
 
@@ -307,6 +308,7 @@ build() {
             -Dwayland="$wayland" \
             -Dx11="$x11" \
             -Dregex="$regex" \
+            -Dfifo="$fifo" \
             --prefix "$prefix" \
             build || exit 1
     else
@@ -320,6 +322,7 @@ build() {
             -Dwayland="$wayland" \
             -Dx11="$x11" \
             -Dregex="$regex" \
+            -Dfifo="$fifo" \
             --prefix "$prefix" \
             build || exit 1
     fi

spmenu.c

@@ -181,7 +181,6 @@ static size_t listsize;
 
 static char *fonts[] = { font };
 
-// include functions
 #include "libs/img.c"
 #include "libs/icon.c"
 #include "libs/rtl.c"
@@ -194,6 +193,7 @@ static char *fonts[] = { font };
 #include "libs/argv.c"
 #include "libs/history.c"
 #include "libs/arg.c"
+#include "libs/fifo.c"
 
 #if X11
 static Key keys[] = {
@@ -555,6 +555,10 @@ void handle(void) {
 
         init_appearance(); // init colorschemes by reading arrays
 
+#if FIFO
+        init_fifo();
+#endif
+
         setupdisplay_x11(); // set up display and create window
         eventloop_x11(); // function is a loop which checks X11 events and calls other functions accordingly
 #endif
@@ -582,6 +586,10 @@ void handle(void) {
         set_mode();
         init_appearance();
 
+#if FIFO
+        init_fifo();
+#endif
+
         handle_wl();
 #endif
     }