Use pkgTagSection::Key in more places in src:apt

The speed critical paths were converted earlier, but the remaining
could benefit a tiny bit from this as well especially as we have the
facility now available and can therefore brush up the code in various
places in the process as well.

Also takes the time to add the hidden Exists method advertised in
the headers, but previously not implemented.

1 files changed, 7 insertions, 4 deletions

diff --git a/apt-private/private-show.cc b/apt-private/private-show.cc
index b56b87d67..46c4c35e7 100644
--- a/apt-private/private-show.cc
+++ b/apt-private/private-show.cc
@@ -17,6 +17,7 @@
 #include <apt-pkg/policy.h>
 #include <apt-pkg/sourcelist.h>
 #include <apt-pkg/strutl.h>
+#include <apt-pkg/tagfile-keys.h>
 #include <apt-pkg/tagfile.h>
 
 #include <apt-private/private-cacheset.h>
@@ -233,13 +234,15 @@ static bool DisplayRecordV2(pkgCacheFile &CacheFile, pkgRecords &Recs, /*{{{*/
 
    // make size nice
    std::string installed_size;
-   if (Tags.FindULL("Installed-Size") > 0)
-      strprintf(installed_size, "%sB", SizeToStr(Tags.FindULL("Installed-Size") * 1024).c_str());
+   auto const installed_size_field = Tags.FindULL(pkgTagSection::Key::Installed_Size);
+   if (installed_size_field > 0)
+      installed_size = SizeToStr(installed_size_field * 1024).append("B");
    else
       installed_size = _("unknown");
    std::string package_size;
-   if (Tags.FindULL("Size") > 0)
-      strprintf(package_size, "%sB", SizeToStr(Tags.FindULL("Size")).c_str());
+   auto const package_size_field = Tags.FindULL(pkgTagSection::Key::Size);
+   if (package_size_field > 0)
+      package_size = SizeToStr(package_size_field).append("B");
    else
       package_size = _("unknown");