Userland: Add a /bin/pape helper program to switch the desktop wallpaper.

Kernel/sync.sh

@@ -54,14 +54,13 @@ cp -v ../Terminal/Terminal mnt/bin/Terminal
 cp -v ../FontEditor/FontEditor mnt/bin/FontEditor
 cp -v ../Launcher/Launcher mnt/bin/Launcher
 cp -v ../Clock/Clock mnt/bin/Clock
-ln -s FontEditor mnt/bin/ff
-ln -s Clock mnt/bin/cl
+cp -v ../Userland/pape mnt/bin/pape
 cp -v ../Userland/dmesg mnt/bin/dmesg
 cp -v ../Userland/chmod mnt/bin/chmod
 cp -v ../Userland/top mnt/bin/top
-sh sync-local.sh
 cp -v kernel.map mnt/
 ln -s dir_a mnt/dir_cur
 ln -s nowhere mnt/bad_link
+sh sync-local.sh
 umount mnt
 sync

Userland/.gitignore

@@ -31,3 +31,4 @@ rmdir
 dmesg
 top
 chmod
+pape

Userland/Makefile

@@ -22,6 +22,7 @@ OBJS = \
        guitest.o \
        guitest2.o \
        sysctl.o \
+       pape.o \
        cp.o \
        rmdir.o \
        dmesg.o \
@@ -54,6 +55,7 @@ APPS = \
        guitest \
        guitest2 \
        sysctl \
+       pape \
        cp \
        rmdir \
        dmesg \
@@ -154,6 +156,9 @@ guitest2: guitest2.o
 sysctl: sysctl.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+pape: pape.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 cp: cp.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 

Userland/pape.cpp

@@ -0,0 +1,125 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <AK/AKString.h>
+#include <AK/StringBuilder.h>
+#include <AK/Vector.h>
+#include <AK/FileSystemPath.h>
+
+static bool flag_show_all = false;
+static int show_all();
+static int show_current();
+static int set_pape(const char*);
+
+static void usage()
+{
+    printf("usage: pape [-a] [name]\n");
+}
+
+int main(int argc, char** argv)
+{
+    int opt;
+    while ((opt = getopt(argc, argv, "a")) != -1) {
+        switch (opt) {
+        case 'a':
+            flag_show_all = true;
+            break;
+        default:
+            usage();
+            return 0;
+        }
+    }
+
+    if (flag_show_all)
+        return show_all();
+
+    if (argc == 1) {
+        show_current();
+        return 0;
+    }
+
+    if (optind >= argc) {
+        usage();
+        return 0;
+    }
+
+    return set_pape(argv[optind]);
+}
+
+int show_all()
+{
+    DIR* dirp = opendir("/res/wallpapers");
+    if (!dirp) {
+        perror("opendir");
+        return 1;
+    }
+    while (auto* de = readdir(dirp)) {
+        if (de->d_name[0] == '.')
+            continue;
+        printf("%s\n", de->d_name);
+    }
+    closedir(dirp);
+    return 0;
+}
+
+static String read_var(const String& name)
+{
+    StringBuilder builder;
+    builder.append("/proc/sys/");
+    builder.append(name);
+    auto path = builder.to_string();
+    int fd = open(path.characters(), O_RDONLY);
+    if (fd < 0) {
+        perror("open");
+        exit(1);
+    }
+    char buffer[BUFSIZ];
+    int nread = read(fd, buffer, sizeof(buffer));
+    close(fd);
+    if (nread < 0) {
+        perror("read");
+        exit(1);
+    }
+    return String(buffer, nread, Chomp);
+}
+
+static void write_var(const String& name, const String& value)
+{
+    StringBuilder builder;
+    builder.append("/proc/sys/");
+    builder.append(name);
+    auto path = builder.to_string();
+    int fd = open(path.characters(), O_WRONLY);
+    if (fd < 0) {
+        perror("open");
+        exit(1);
+    }
+    int nwritten = write(fd, value.characters(), value.length());
+    if (nwritten < 0) {
+        perror("read");
+        exit(1);
+    }
+    close(fd);
+}
+
+int show_current()
+{
+    FileSystemPath path(read_var("wm_wallpaper"));
+    printf("%s\n", path.basename().characters());
+    return 0;
+}
+
+int set_pape(const char* name)
+{
+    StringBuilder builder;
+    builder.append("/res/wallpapers/");
+    builder.append(name);
+
+    write_var("wm_wallpaper", builder.to_string());
+    return 0;
+}