Simplify install command

- Install does not do update.
- Share code when installing from URL or name.

pkg/omf/cli/omf.install.fish

-function omf.install -a type_flag name_or_url
-  function _display_success
+function omf.install -a name_or_url
+  function __omf.install.success
     echo (omf::em)"✔ $argv successfully installed."(omf::off)
   end
 
-  function _display_error
+  function __omf.install.error
     echo (omf::err)"Could not install $argv."(omf::off) 1^&2
   end
 
-  switch $type_flag
-    case "--theme"
-      set install_type "theme"
-      set parent_path "themes"
-    case "--pkg"
-      set install_type "package"
-      set parent_path "pkg"
-    case "*"
-      echo (omf::err)"Argument to omf.install must be --theme [name|URL] or --pkg [name|URL]"(omf::off)
-      return $OMF_INVALID_ARG
+  if test \( -e $OMF_PATH/db/themes/$name_or_url \) -o (echo $name_or_url | grep theme-)
+    set install_type "theme"
+    set parent_path "themes"
+  else
+    set install_type "package"
+    set parent_path "pkg"
   end
 
   if test -e $OMF_PATH/db/$parent_path/$name_or_url
-    set target $parent_path/$name_or_url
+    set name $name_or_url
+    set url (cat $OMF_PATH/db/$parent_path/$name_or_url)
   else
-    set -l local_name (basename $name_or_url | sed "s/^pkg-//;s/^plugin-//;s/^theme-//")
-    if test -e $OMF_PATH/$parent_path/$local_name
-      echo (omf::err)"Error: $local_name $install_type already installed."(omf::off) 1^&2
-    else
-      echo (omf::dim)"Trying to clone from URL..."(omf::off)
-      if omf.repo.clone $name_or_url $OMF_PATH/$parent_path/$local_name
-        omf.bundle.add $install_type $name_or_url
-        _display_success "$install_type $name_or_url"
-      else
-        _display_error "$install_type $name_or_url"
-        return $OMF_UNKNOWN_ERR
-      end
-    end
-    return 0
+    set name (basename $name_or_url | sed "s/^pkg-//;s/^plugin-//;s/^theme-//")
+    set url $name_or_url
   end
 
-  if test -e $OMF_PATH/$target
-    echo (omf::dim)"Updating $name_or_url $install_type..."(omf::off)
-    omf.repo.pull $OMF_PATH/$target
-    echo (omf::em)"✔ $name_or_url $install_type up to date."(omf::off)
+  if test -e $OMF_PATH/$parent_path/$name
+    if test "$install_type" = theme
+      omf.theme $name
+    else
+      echo (omf::err)"Error: $name $install_type already installed."(omf::off) 1^&2
+      return $OMF_INVALID_ARG
+    end
   else
-    echo (omf::dim)"Installing $name_or_url $install_type..."(omf::off)
-    if omf.repo.clone (cat $OMF_PATH/db/$target) $OMF_PATH/$target
+    echo (omf::dim)"Installing $install_type $name"(omf::off)
+
+    if omf.repo.clone $url $OMF_PATH/$parent_path/$name
       omf.bundle.add $install_type $name_or_url
-      _display_success "$install_type $name_or_url"
+      __omf.install.success "$install_type $name"
+
+      if test "$install_type" = theme
+        omf.theme $name
+      end
     else
-      _display_error "$install_type $name_or_url"
+      __omf.install.error "$install_type $name"
       return $OMF_UNKNOWN_ERR
     end
   end

pkg/omf/cli/omf.install_package.fish

 function omf.install_package
   for search in $argv
-    omf.install --pkg $search
+    omf.install $search
   end
 end

pkg/omf/omf.fish

@@ -78,7 +78,10 @@ function omf -d "Oh My Fish"
       if test (count $argv) -eq 1
         omf.bundle.install
       else
-        omf.install_package $argv[2..-1]
+        for package in $argv[2..-1]
+          omf.install $package
+        end
+
         refresh
       end
 
@@ -121,9 +124,6 @@ function omf -d "Oh My Fish"
         omf.packages.list --database --theme | column | sed -E "s/$regex/"(omf::em)"\1"(omf::off)"/"
         omf::off
       else if test (count $argv) -eq 2
-        if not contains -- $argv[2] (omf.packages.list --installed)
-          omf.install --theme $argv[2]; or return 1
-        end
         omf.theme $argv[2]
       else
         echo (omf::err)"Invalid number of arguments"(omf::off) 1^&2