Migrate to GitLab CI.

- Update pre-commit checks.
- Replace Travis CI with GitLab CI.
- Address new warnings from pre-commit checks.

.gitlab-ci.yml

+---
+stages:
+  - test
+
+pre-commit:
+  stage: test
+  image: adarnimrod/ci-images:pre-commit
+  variables:
+    XDG_CACHE_HOME: "$CI_PROJECT_DIR/.cache"
+  script:
+    - pre-commit run --all-files
+  cache:
+    paths:
+      - .cache/
+
+bats:
+  stage: test
+  image: alpine
+  before_script:
+    - apk add --update bats git
+    - git config --global user.email "you@example.com"
+    - git config --global user.name "Your Name"
+  script:
+    - bats tests/

.pre-commit-config.yaml

--   repo: https://github.com/pre-commit/pre-commit-hooks
-    sha: v0.9.1
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks.git
+    rev: v3.4.0
     hooks:
-    -   id: check-added-large-files
-    -   id: check-merge-conflict
-    -   id: check-yaml
--   repo: https://git.shore.co.il/nimrod/shell-pre-commit.git
-    sha: v0.5.4
+      - id: check-added-large-files
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: check-symlinks
+      - id: check-yaml
+      - id: trailing-whitespace
+
+  - repo: https://git.shore.co.il/nimrod/shell-pre-commit.git
+    rev: v0.6.0
     hooks:
-    -   id: shell-lint
-        files: &shellscripts '^merge-conflict$'
-    -   id: shellcheck
-        files: *shellscripts
--   repo: https://git.shore.co.il/nimrod/git-pre-commit.git
-    sha: v0.1.1
+      - id: shell-lint
+      - id: shellcheck
+
+  - repo: https://git.shore.co.il/nimrod/git-pre-commit.git
+    rev: v0.1.1
     hooks:
-    -   id: merge-conflict
+      - id: merge-conflict
+
+  - repo: https://github.com/pre-commit/pre-commit.git
+    rev: v2.9.3
+    hooks:
+      - id: validate_manifest
+
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.25.0
+    hooks:
+      - id: yamllint
+
+  - repo: https://github.com/amperser/proselint.git
+    rev: 0.10.2
+    hooks:
+      - id: proselint
+        types: [plain-text]
+        exclude: LICENSE

.pre-commit-hooks.yaml

@@ -5,4 +5,4 @@
   language: script
   entry: merge-conflict
   files: '$^'
-  always_run: True
+  always_run: true

.travis.yml

----
-dist: trusty
-sudo: false
-group: beta
-cache:
-  - pip
-  - directories:
-      - $HOME/.pre-commit
-      - $HOME/.cabal
-      - $HOME/.ghc
-
-matrix:
-    fast_finish: True
-    include:
-        - language: python
-          python: "3.6"
-          env:
-              PATH: "$HOME/.cabal/bin:$PATH"
-          addons:
-            apt:
-              packages:
-                  - cabal-install
-                  - ghc
-          install:
-              - cabal update && cabal install shellcheck
-              - pip install pre_commit | cat
-              - pre-commit install-hooks
-          script:
-              - pre-commit run --all-files
-        - language: shell
-          script:
-              bats -t tests/
-
-notifications:
-  on_failure: never
-  email: false

README.md

 # Git pre-commit hooks
 
-[![Build
-Status](https://travis-ci.org/adarnimrod/git-pre-commit.svg?branch=master)](https://travis-ci.org/adarnimrod/git-pre-commit)
+ [![pipeline status](https://git.shore.co.il/nimrod/git-pre-commit/badges/master/pipeline.svg)](https://git.shore.co.il/nimrod/git-pre-commit/-/commits/master)
 
 [Pre-commit](http://pre-commit.com/) Git related hooks.
 
@@ -28,4 +27,4 @@ This software is licensed under the MIT license (see the `LICENSE.txt` file).
 Nimrod Adar, [contact me](mailto:nimrod@shore.co.il) or visit my
 [website](https://www.shore.co.il/). Patches are welcome via [git
 send-email](http://git-scm.com/book/en/v2/Git-Commands-Email). The repository is
-located at <https://git.shore.co.il/nimrod/>.
+located at <https://git.shore.co.il/explore>.

tests/merge-conflict.bats

-#!/usr/bin/env bats
-
 export PATH="$BATS_TEST_DIRNAME/../:$PATH"
 export repo="$BATS_TMPDIR/testrepo"