Deprecations: readstring, Nullables, warn

src/generate.jl

@@ -109,12 +109,12 @@ function generate(
         end
         mkpath(backup_dir)
         mv(temp_pkg_dir, joinpath(backup_dir, pkg_name))
-        warn("$pkg_name couldn't be moved into $pkg_dir, left package in $backup_dir")
+        @warn "$pkg_name couldn't be moved into $pkg_dir, left package in $backup_dir"
     end
 
     @info "Finished"
     if multiple_branches
-        warn("Remember to push all created branches to your remote: git push --all")
+        @warn "Remember to push all created branches to your remote: git push --all"
     end
 end
 

src/plugin.jl

@@ -213,13 +213,11 @@ function gen_plugin(
     dir::AbstractString,
     pkg_name::AbstractString,
 )
-    src = try
-        plugin.src
-    catch
+    if plugin.src === nothing
         return String[]
     end
     text = substitute(
-        readstring(src),
+        read(plugin.src, String),
         template;
         view=merge(Dict("PKGNAME" => pkg_name), plugin.view),
     )