feat: labeles transfer for github repositories

package/github/gh_translabeles.nix

@@ -0,0 +1,102 @@
+# FIXME: very unstable (on every request opens pager) but works somehow
+{ pkgs, ... }:
+pkgs.writeShellScriptBin "gh_translabeles" ''
+  set -euo pipefail
+
+  # Function to display usage information
+  usage() {
+    echo "Usage: $0 [--force] <source_repo> <target_repo>"
+    echo "Options:"
+    echo "  --force    Replace existing labels in the target repository."
+    echo "Example:"
+    echo "  $0 owner/source-repo owner/target-repo"
+    echo "  $0 --force owner/source-repo owner/target-repo"
+    exit 1
+  }
+
+  # Initialize variables
+  FORCE=0
+
+  # Parse options
+  while [[ "$#" -gt 0 ]]; do
+    case "$1" in
+      --force)
+        FORCE=1
+        shift
+        ;;
+      -h|--help)
+        usage
+        ;;
+      *)
+        break
+        ;;
+    esac
+  done
+
+  # Check for required arguments
+  if [ "$#" -ne 2 ]; then
+    usage
+  fi
+
+  SOURCE_REPO="$1"
+  TARGET_REPO="$2"
+  TEMP_FILE="$(mktemp)"
+  trap 'rm -f "$TEMP_FILE"' EXIT
+
+  # Check if required commands are available
+  for cmd in ${pkgs.gh}/bin/gh ${pkgs.jq}/bin/jq; do
+    if ! command -v "$cmd" &>/dev/null; then
+      echo "Error: '$cmd' is not installed or not in PATH."
+      exit 1
+    fi
+  done
+
+  # Fetch all labels from the source repository with pagination
+  echo "Fetching labels from $SOURCE_REPO..."
+  
+  LABELS_JSON=$(${pkgs.gh}/bin/gh api -H "Accept: application/vnd.github.v3+json" \
+    /repos/"$SOURCE_REPO"/labels --paginate | ${pkgs.jq}/bin/jq -s 'add')
+
+  if [ -z "$LABELS_JSON" ] || [ "$LABELS_JSON" == "[]" ]; then
+    echo "No labels found or an error occurred." >&2
+    exit 1
+  fi
+
+  echo "$LABELS_JSON" > "$TEMP_FILE"
+
+  # Create or update labels in the target repository
+  echo "Processing labels for $TARGET_REPO..."
+  ${pkgs.jq}/bin/jq -c '.[]' "$TEMP_FILE" | while IFS= read -r label; do
+    name=$(echo "$label" | ${pkgs.jq}/bin/jq -r '.name')
+    encoded_name=$(echo "$name" | ${pkgs.jq}/bin/jq -s -R -r @uri)
+    color=$(echo "$label" | ${pkgs.jq}/bin/jq -r '.color')
+    description=$(echo "$label" | ${pkgs.jq}/bin/jq -r '.description // ""')
+
+    if [ "$FORCE" -eq 1 ]; then
+      echo "Creating or updating label '$name' in $TARGET_REPO..."
+      if ! ${pkgs.gh}/bin/gh api -X PATCH -H "Accept: application/vnd.github.v3+json" \
+          /repos/"$TARGET_REPO"/labels/"$encoded_name" \
+          -f name="$name" -f color="$color" -f description="$description"; then
+        echo "Error: Failed to create/update label '$name'. Skipping."
+      else
+        echo "Label '$name' has been created/updated in $TARGET_REPO."
+      fi
+    else
+      if ${pkgs.gh}/bin/gh api -H "Accept: application/vnd.github.v3+json" \
+        /repos/"$TARGET_REPO"/labels/"$encoded_name" &>/dev/null; then
+        echo "Label '$name' already exists in $TARGET_REPO. Skipping."
+      else
+        echo "Creating label '$name' in $TARGET_REPO..."
+        if ! ${pkgs.gh}/bin/gh api -X POST -H "Accept: application/vnd.github.v3+json" \
+            /repos/"$TARGET_REPO"/labels \
+            -f name="$name" -f color="$color" -f description="$description"; then
+          echo "Warning: Label '$name' already exists or failed to create. Skipping."
+        else
+          echo "Label '$name' has been created in $TARGET_REPO."
+        fi
+      fi
+    fi
+  done
+
+  echo "Label transfer completed successfully."
+''