Packages (Linux): add pkgsrc detection

We will not add pkgsrc detection for macOS unless someone can verify it.

Ref: https://cvsweb.netbsd.org/bsdweb.cgi/pkgsrc/sysutils/fastfetch/patches/patch-src_detection_packages_packages__linux.c?rev=1.1;content-type=text%2Fplain

Author: CarterLi

CHANGELOG.md

@@ -11,6 +11,7 @@ Features:
 * Support default route detection on OpenBSD & DragonFly BSD (LocalIP, OpenBSD / DragonFly)
 * Improve bash completion script
 * Improve performance of networking (PublicIP / Weather)
+* Support pkgsrc package manager detection on Linux (Packages, Linux)
 
 Logo:
 * Add Common Torizon OS

src/detection/packages/packages_linux.c

@@ -574,6 +574,7 @@ static void getPackageCounts(FFstrbuf* baseDir, FFPackagesResult* packageCounts,
     if (!(options->disabled & FF_PACKAGES_FLAG_PACSTALL_BIT)) packageCounts->pacstall += getNumElements(baseDir, "/var/lib/pacstall/metadata", false);
     if (!(options->disabled & FF_PACKAGES_FLAG_QI_BIT)) packageCounts->qi += getNumStrings(baseDir, "/var/qi/installed_packages.list", "\n", "qi");
     if (!(options->disabled & FF_PACKAGES_FLAG_PISI_BIT)) packageCounts->pisi += getNumElements(baseDir, "/var/lib/pisi/package", true);
+    if (!(options->disabled & FF_PACKAGES_FLAG_PKGSRC_BIT)) packageCounts->pkgsrc += getNumElements(baseDir, "/usr/pkg/pkgdb", DT_DIR);
 }
 
 static void getPackageCountsRegular(FFstrbuf* baseDir, FFPackagesResult* packageCounts, FFPackagesOptions* options)