Use ctpvquit instead of cmd on-quit

cmd on-quit is not available in the latest lf release (r27)

Makefile

@@ -25,7 +25,7 @@ options:
 
 install: install.bin install.man
 
-install.bin: ctpv ctpvclear
+install.bin: ctpv quit/ctpvquit ctpvclear
 	$(INSTALL) -d $(BINPREFIX)
 	$(INSTALL) $^ $(BINPREFIX)
 
@@ -34,11 +34,13 @@ install.man: doc/ctpv.1
 	$(INSTALL) -m 0644 $^ $(MANPREFIX)
 
 uninstall:
-	$(RM) $(BINPREFIX)/ctpv $(BINPREFIX)/ctpvclear $(MANPREFIX)/ctpv.1
+	$(RM) $(BINPREFIX)/ctpv $(BINPREFIX)/ctpvclear $(BINPREFIX)/ctpvquit \
+		$(MANPREFIX)/ctpv.1
 
 clean:
 	$(RM) ctpv $(OBJ) $(DEP) $(GEN)
 	$(MAKE) -C embed clean
+	$(MAKE) -C quit clean
 
 docs: README.md doc/ctpv.1
 	deptable/list.awk $(PRE) | deptable/markdown.sed | deptable/insert.awk README.md
@@ -70,6 +72,9 @@ gen:
 embed/embed: .force
 	$(MAKE) -C embed
 
+quit/ctpvquit: .force
+	$(MAKE) -C quit
+
 -include $(DEP)
 
 .PHONY: all options install install.bin install.man uninstall \

README.md

@@ -96,16 +96,11 @@ yay -S ctpv-git
 Add these lines to your lf config
 (usually located at `~/.config/lf/lfrc`).
 
-Note: `on-quit` command is not a part of
-[lf r27 release](https://github.com/gokcehan/lf/releases/tag/r27)
-yet, so I strongly suggest you to install the latest version [from the GitHub page][lf]
-(or [`lf-git`](https://aur.archlinux.org/packages/lf-git) AUR package if you use Arch Linux).
-
 ```
 set previewer ctpv
 set cleaner ctpvclear
 &ctpv -s $id
-cmd on-quit $ctpv -e $id
+&ctpvquit $id
 ```
 
 ## Documentation

doc/ctpv.1

@@ -145,7 +145,7 @@ configuration file (usually located at
 set previewer ctpv
 set cleaner ctpvclear
 &ctpv -s $id
-cmd on-quit $ctpv -e $id
+&ctpvquit $id
 .EE
 .RE
 .

quit/Makefile

@@ -0,0 +1,6 @@
+ctpvquit: ctpvquit.c
+
+clean:
+	$(RM) ctpvquit
+
+.PHONY: clean

quit/ctpvquit.c

@@ -0,0 +1,48 @@
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+
+int main (int argc, char *argv[])
+{
+    if (argc <= 1) {
+        fprintf(stderr, "id not given\n");
+        return EXIT_FAILURE;
+    }
+
+    char *pid_s = argv[1];
+
+    char *endptr;
+
+    errno = 0;
+    long pid = strtol(pid_s, &endptr, 10);
+
+    if (errno != 0) {
+        perror("strtol");
+        return EXIT_FAILURE;
+    }
+
+    if (endptr == pid_s) {
+        fprintf(stderr, "%s: invalid number\n", pid_s);
+        return EXIT_FAILURE;
+    }
+
+    while (1) {
+        sleep(5);
+
+        if (kill(pid, 0) == -1) {
+            if (errno != ESRCH) {
+                perror("kill");
+                return EXIT_FAILURE;
+            }
+
+            execlp("ctpv", "ctpv", "-e", pid_s, NULL);
+            perror("execlp");
+            break;
+        }
+    }
+
+    return EXIT_FAILURE;
+}