Revert "ci: Import run-eslint script from gnome-shell"

Filtering errors by changed lines in a merge request means some
errors can slip through, for example when an import becomes unused
but isn't removed.

That's more common than rules changing behind our back, so revert
to running eslint directly again.

This reverts commit 119da3291b.

.gitlab-ci.yml

@@ -3,6 +3,9 @@ stages:
  - source_check
  - build
 
+variables:
+ LINT_LOG: "eslint-report.txt"
+
 .only_default: &only_default
     only:
         - branches
@@ -21,11 +24,11 @@ eslint:
   image: registry.gitlab.gnome.org/gnome/gnome-shell/extension-ci:v1
   stage: source_check
   script:
-    - ./.gitlab-ci/run-eslint.sh
+    - eslint -o $LINT_LOG --no-color || { cat $LINT_LOG; false; }
   <<: *only_default
   artifacts:
     paths:
-      - reports
+      - ${LINT_LOG}
     when: on_failure
 
 build-shell-extensions:

.gitlab-ci/run-eslint.sh

@@ -1,78 +0,0 @@
-#!/usr/bin/env bash
-
-OUTPUT_REGULAR=reports/lint-report.txt
-OUTPUT_MR=reports/lint-mr-report.txt
-
-SRCDIR=extensions
-
-LINE_CHANGES=changed-lines.txt
-
-is_empty() {
-  (! grep -q . $1)
-}
-
-run_eslint() {
-  # ensure output exists even if eslint doesn't report any errors
-  mkdir -p $(dirname $OUTPUT_REGULAR)
-  touch $OUTPUT_REGULAR
-
-  eslint -f unix -o $OUTPUT_REGULAR $SRCDIR
-}
-
-list_commit_range_additions() {
-  # Turn raw context-less git-diff into a list of
-  # filename:lineno pairs of new (+) lines
-  git diff -U0 "$@" -- js |
-  awk '
-    BEGIN { file=""; }
-    /^+++ b/ { file=substr($0,7); }
-    /^@@ / {
-        len = split($3,a,",")
-        start=a[1]
-        count=(len > 1) ? a[2] : 1
-
-        for (line=start; line<start+count; line++)
-            printf "%s/%s:%d:\n",ENVIRON["PWD"],file,line;
-    }'
-}
-
-copy_matched_lines() {
-  local source=$1
-  local matches=$2
-  local target=$3
-
-  echo -n > $target
-  for l in $(<$matches); do
-    grep $l $source >> $target
-  done
-}
-
-# Clean up old files from previous runs
-rm -f $OUTPUT_REGULAR $OUTPUT_MR $LINE_CHANGES
-
-if [ "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" ]; then
-  git fetch $CI_MERGE_REQUEST_PROJECT_URL.git $CI_MERGE_REQUEST_TARGET_BRANCH_NAME
-  branch_point=$(git merge-base HEAD FETCH_HEAD)
-  commit_range=$branch_point...$CI_COMMIT_SHA
-
-  list_commit_range_additions $commit_range > $LINE_CHANGES
-
-  # Don't bother with running lint when no JS changed
-  if is_empty $LINE_CHANGES; then
-    exit 0
-  fi
-fi
-
-echo Generating lint report
-run_eslint
-echo Done.
-
-# Just show the report and succeed when not testing a MR
-if [ -z "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" ]; then
-  cat $OUTPUT_REGULAR
-  exit 0
-fi
-
-copy_matched_lines $OUTPUT_REGULAR $LINE_CHANGES $OUTPUT_MR
-cat $OUTPUT_MR
-is_empty $OUTPUT_MR