fix(gh): preserve valid completion cache on failure

.github/workflows/scorecard.yml

@@ -60,6 +60,6 @@ jobs:
           retention-days: 5
 
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
+        uses: github/codeql-action/upload-sarif@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0
         with:
           sarif_file: results.sarif

plugins/gh/README.md

@@ -18,3 +18,5 @@ plugin is loaded, which is usually when you start up a new terminal emulator.
 The cache is stored at:
 
 - `$ZSH_CACHE_DIR/completions/_gh` completions script
+
+If an update fails, the last successfully generated completion script is kept.

plugins/gh/gh.plugin.zsh

@@ -13,6 +13,12 @@ fi
 
 zmodload -F zsh/files b:zf_mv
 () {
-  local TMPPREFIX="$ZSH_CACHE_DIR/completions/_gh"
-  zf_mv -f -- =( gh completion --shell zsh ) "$TMPPREFIX"
+  local completion_file="$ZSH_CACHE_DIR/completions/_gh"
+  local completion_tmp="${completion_file}.$$.${RANDOM}"
+
+  if gh completion --shell zsh >| "$completion_tmp" && [[ -s "$completion_tmp" ]]; then
+    zf_mv -f -- "$completion_tmp" "$completion_file"
+  fi
+
+  command rm -f -- "$completion_tmp"
 } &|