"apt show" show user friendly size info

The size/installed-size is displayed via SizeToStr() and Size
is rewriten to "Download-Size" to make clear what size is refered
to here.

apt-pkg/tagfile.cc

@@ -567,52 +567,54 @@ bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
    }
    
    // Write all all of the tags, in order.
-   for (unsigned int I = 0; Order[I] != 0; I++)
+   if (Order != NULL)
    {
-      bool Rewritten = false;
-      
-      // See if this is a field that needs to be rewritten
-      for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+      for (unsigned int I = 0; Order[I] != 0; I++)
       {
-	 if (strcasecmp(Rewrite[J].Tag,Order[I]) == 0)
-	 {
-	    Visited[J] |= 2;
-	    if (Rewrite[J].Rewrite != 0 && Rewrite[J].Rewrite[0] != 0)
-	    {
-	       if (isspace(Rewrite[J].Rewrite[0]))
-		  fprintf(Output,"%s:%s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
-	       else
-		  fprintf(Output,"%s: %s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
-	    }
-	    
-	    Rewritten = true;
-	    break;
-	 }
-      }      
+         bool Rewritten = false;
+         
+         // See if this is a field that needs to be rewritten
+         for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+         {
+            if (strcasecmp(Rewrite[J].Tag,Order[I]) == 0)
+            {
+               Visited[J] |= 2;
+               if (Rewrite[J].Rewrite != 0 && Rewrite[J].Rewrite[0] != 0)
+               {
+                  if (isspace(Rewrite[J].Rewrite[0]))
+                     fprintf(Output,"%s:%s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+                  else
+                     fprintf(Output,"%s: %s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+               }
+               Rewritten = true;
+               break;
+            }
+         }
 	    
-      // See if it is in the fragment
-      unsigned Pos;
-      if (Tags.Find(Order[I],Pos) == false)
-	 continue;
-      Visited[Pos] |= 1;
-
-      if (Rewritten == true)
-	 continue;
+         // See if it is in the fragment
+         unsigned Pos;
+         if (Tags.Find(Order[I],Pos) == false)
+            continue;
+         Visited[Pos] |= 1;
+
+         if (Rewritten == true)
+            continue;
       
-      /* Write out this element, taking a moment to rewrite the tag
-         in case of changes of case. */
-      const char *Start;
-      const char *Stop;
-      Tags.Get(Start,Stop,Pos);
+         /* Write out this element, taking a moment to rewrite the tag
+            in case of changes of case. */
+         const char *Start;
+         const char *Stop;
+         Tags.Get(Start,Stop,Pos);
       
-      if (fputs(Order[I],Output) < 0)
-	 return _error->Errno("fputs","IO Error to output");
-      Start += strlen(Order[I]);
-      if (fwrite(Start,Stop - Start,1,Output) != 1)
-	 return _error->Errno("fwrite","IO Error to output");
-      if (Stop[-1] != '\n')
-	 fprintf(Output,"\n");
-   }   
+         if (fputs(Order[I],Output) < 0)
+            return _error->Errno("fputs","IO Error to output");
+         Start += strlen(Order[I]);
+         if (fwrite(Start,Stop - Start,1,Output) != 1)
+            return _error->Errno("fwrite","IO Error to output");
+         if (Stop[-1] != '\n')
+            fprintf(Output,"\n");
+      }
+   }
 
    // Now write all the old tags that were missed.
    for (unsigned int I = 0; I != Tags.Count(); I++)

apt-private/private-show.cc

@@ -57,20 +57,32 @@ bool DisplayRecord(pkgCacheFile &CacheFile, pkgCache::VerIterator V,
       return false;
    pkgTagSection Tags;
    pkgTagFile TagF(&PkgF);
-   
+
+   if (TagF.Jump(Tags, V.FileList()->Offset) == false)
+      return _error->Error("Internal Error, Unable to parse a package record");
+
+   // make size nice
+   std::string installed_size;
+   if (Tags.FindI("Installed-Size") > 0)
+      installed_size = SizeToStr(Tags.FindI("Installed-Size")*1024);
+   else
+      installed_size = _("unknown");
+   std::string package_size;
+   if (Tags.FindI("Size") > 0)
+      package_size = SizeToStr(Tags.FindI("Size"));
+   else
+      package_size = _("unknown");
+
    TFRewriteData RW[] = {
       {"Conffiles",0},
       {"Description",0},
       {"Description-md5",0},
+      {"Installed-Size", installed_size.c_str(), 0},
+      {"Size", package_size.c_str(), "Download-Size"},
       {}
    };
-   const char *Zero = 0;
-   if (TagF.Jump(Tags, V.FileList()->Offset) == false ||
-       TFRewrite(stdout,Tags,&Zero,RW) == false)
-   {
-      _error->Error("Internal Error, Unable to parse a package record");
-      return false;
-   }
+   if(TFRewrite(stdout, Tags, NULL, RW) == false)
+      return _error->Error("Internal Error, Unable to parse a package record");
 
    // write the description
    pkgRecords Recs(*Cache);

test/integration/test-apt-cli-show

@@ -19,11 +19,12 @@ APTARCHIVE=$(readlink -f ./aptarchive)
 testequal "Package: foo
 Priority: optional
 Section: other
-Installed-Size: 42
+Installed-Size: 43.0 k
 Maintainer: Joe Sixpack <joe@example.org>
 Architecture: all
 Version: 1.0
 Filename: pool/main/foo/foo_1.0_all.deb
+Download-Size: unknown
 Description: Some description 
  That has multiple lines
 " apt show foo