Fix lint error formatting for errors at end of line (nextflow-io#6717)

Co-authored-by: Ben Sherman <bentshermann@gmail.com>

Author: ewels

modules/nextflow/src/main/groovy/nextflow/script/parser/v2/ErrorListener.groovy

@@ -157,8 +157,8 @@ class StandardErrorListener implements ErrorListener {
 
         for( int i = fromLine; i <= toLine; i++ ) {
             String fullLine = lines[i - 1]
-            int start = (i == startLine) ? startColumn - 1 : 0
-            int end = (i == endLine) ? endColumn - 1 : fullLine.length()
+            int start = (i == startLine) ? Math.min(startColumn - 1, fullLine.length()) : 0
+            int end = (i == endLine) ? Math.min(endColumn - 1, fullLine.length()) : fullLine.length()
 
             // Truncate to max 70 characters
             int maxLen = 70
@@ -174,8 +174,8 @@ class StandardErrorListener implements ErrorListener {
             }
 
             String line = fullLine.substring(windowStart, Math.min(lineLen, windowStart + maxLen))
-            int adjStart = Math.max(0, start - windowStart)
-            int adjEnd = Math.max(adjStart + 1, Math.min(end - windowStart, line.length()))
+            int adjStart = Math.max(0, Math.min(start - windowStart, line.length()))
+            int adjEnd = Math.max(adjStart, Math.min(end - windowStart, line.length()))
 
             // Left border
             if(i == toLine && i !== startLine) term.fg(color).a("╰").reset().a(" ")

modules/nextflow/src/test/groovy/nextflow/cli/CmdLintTest.groovy

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2013-2026, Seqera Labs
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package nextflow.cli
+
+import java.nio.file.Files
+
+import nextflow.exception.AbortOperationException
+import org.junit.Rule
+import spock.lang.Specification
+import test.OutputCapture
+/**
+ *
+ * @author Ben Sherman <bentshermann@gmail.com>
+ */
+class CmdLintTest extends Specification {
+
+    @Rule
+    OutputCapture capture = new OutputCapture()
+
+    def 'should report compilation errors' () {
+
+        given:
+        def dir = Files.createTempDirectory('test')
+
+        dir.resolve('main.nf').text = '''\
+            process HELLO {
+
+                script:
+                """
+                ${
+                    params.is_paired_end
+                        ? "..."
+                        : "..."
+                }
+                """
+            }
+            '''
+
+        dir.resolve('nextflow.config').text = '''\
+            process {
+                withLabel:
+                'bambino' {
+                    container = "..."
+                }
+            }
+            '''
+
+        when:
+        def cmd = new CmdLint()
+        cmd.args = [dir.toFile().toString()]
+        cmd.launcher = Mock(Launcher) {
+            getOptions() >> Mock(CliOptions)
+        }
+        cmd.run()
+
+        then:
+        thrown(AbortOperationException)
+        and:
+        capture.toString().contains("Error $dir/main.nf:5:19: Unexpected input: '\\n'")
+        capture.toString().contains("│   5 |                 \${")
+        capture.toString().contains("╰     |                   ^")
+        capture.toString().contains("Error $dir/nextflow.config:2:27: Unexpected input: '\\n'")
+        capture.toString().contains("│   2 |                 withLabel:")
+        capture.toString().contains("╰     |                           ^")
+
+        cleanup:
+        dir?.deleteDir()
+    }
+
+}