fix(extract): fix conflict if compressed file has a folder of the same name

This change fixes the case where the compressed file (e.g. tools.tgz) only
contains a folder with the same name (e.g. tools) in its root folder.

tools.tgz:
|- tools
   |- fileA.txt
   |- fileB.txt
   \- fileC.txt

In that case, the "smart" folder creation mechanism will extract the files in
a folder "tools", and this extraction folder will contain a single folder with
the same name.

Before this fix, the tool would try to move out the inside folder to the parent
one, but there would already be a folder named "tools", so it would generate a
conflict.

This change first renames the inside folder to a random string, and only then
it is moved outside and the old extraction folder is deleted.

plugins/extract/extract.plugin.zsh

@@ -98,8 +98,22 @@ EOF
     local -a content
     content=("${extract_dir}"/*(DNY2))
     if [[ ${#content} -eq 1 && -d "${content[1]}" ]]; then
-      command mv -f "${content[1]}" .
-      command rmdir "$extract_dir"
+      # The extracted folder (${content[1]}) may have the same name as $extract_dir
+      # If so, we need to rename it to avoid conflicts in a 3-step process
+      #
+      # 1. Move and rename the extracted folder to a temporary random name
+      # 2. Delete the empty folder
+      # 3. Rename the extracted folder to the original name
+      if [[ "${content[1]:t}" == "$extract_dir" ]]; then
+        # =(:) gives /tmp/zsh<random>, with :t it gives zsh<random>
+        local tmp_dir==(:); tmp_dir="${tmp_dir:t}"
+        command mv -f "${content[1]}" "$tmp_dir" \
+        && command rmdir "$extract_dir" \
+        && command mv -f "$tmp_dir" "$extract_dir"
+      else
+        command mv -f "${content[1]}" . \
+        && command rmdir "$extract_dir"
+      fi
     elif [[ ${#content} -eq 0 ]]; then
       command rmdir "$extract_dir"
     fi