host: strip OEM information

pfetch

@@ -277,6 +277,43 @@ get_host() {
         ;;
     esac
 
+    # Turn the host string into an argument list so we can iterate
+    # over it and remove OEM strings and other information which
+    # shouldn't be displayed.
+    #
+    # Disable the shellcheck warning for word-splitting
+    # as it's safe and intended ('set -f' disables globbing).
+    # shellcheck disable=2046,2086
+    {
+        set -f
+        set +f -- $host
+        host=
+    }
+
+    # Iterate over the host string word by word as a means of stripping
+    # unwanted and OEM information from the string as a whole.
+    #
+    # This could have been implemented using a long 'sed' command with
+    # a list of word replacements, however I want to show that something
+    # like this is possible in pure sh.
+    #
+    # This string reconstruction is needed as some OEMs either leave the
+    # identification information as "To be filled by OEM", "Default",
+    # "undefined" etc and we shouldn't print this to the screen.
+    for word; do
+        # This works by reconstructing the string by excluding words
+        # found in the "blacklist" below. Only non-matches are appended
+        # to the final host string.
+        case $word in
+            To      | [Bb]e      | [Ff]illed | by     | O.E.M.  | OEM  |\
+            Not     | Applicable | Specified | System | Product | Name |\
+            Version | Undefined  | Default   | string | INVALID | <20>    )
+                continue
+        esac
+
+        host="$host$word "
+    done
+
     # '$arch' is the cached output from 'uname -m'.
     log host "${host:-$arch}" >&6
 }