CI: use a script travis-ci.sh to simplify .travis.yml

.travis.yml

@@ -1,71 +1,10 @@
 language: c
 env:
-  - TO_TEST=changes
-  - TO_TEST=build OCAML_VERSION=4.07.1
-  - TO_TEST=build OCAML_VERSION=4.08.1
-  - TO_TEST=tests OCAML_VERSION=4.09.0
+  - CI_KIND=changes
+  - CI_KIND=build OCAML_VERSION=4.07.1
+  - CI_KIND=build OCAML_VERSION=4.08.1
+  - CI_KIND=build-and-tests OCAML_VERSION=4.09.0
 cache:
   directories:
     - ${HOME}/.opam
-before_install:
-  - |
-    case "$TO_TEST" in
-      build|tests)
-        wget -O ${HOME}/opam https://github.com/ocaml/opam/releases/download/2.0.5/opam-2.0.5-x86_64-linux
-        chmod +x ${HOME}/opam
-        export PATH=${HOME}:${PATH}
-        export OPAMYES=1
-        export OPAMJOBS=2
-        opam init --bare --disable-sandboxing
-        opam switch --dry-run ${OCAML_VERSION} 2>/dev/null || opam switch create ${OCAML_VERSION}
-        ;;
-      changes)
-        ;;
-      *)
-        echo "unknown CI kind"
-        exit 1
-        ;;
-    esac
-install:
-  - |
-    case "$TO_TEST" in
-      build|tests)
-        opam switch ${OCAML_VERSION}
-        opam update --upgrade
-        opam pin add --no-action ocamlformat .
-        opam install --deps-only ocamlformat
-        ;;
-      changes)
-        ;;
-      *)
-        echo "unknown CI kind"
-        exit 1
-        ;;
-    esac
-script:
-  - |
-    case "$TO_TEST" in
-      changes)
-        if [ "$TRAVIS_PULL_REQUEST" != false ] && [ "$TRAVIS_BRANCH" = master ]; then
-          ! git diff --exit-code "$TRAVIS_BRANCH...$TRAVIS_COMMIT" -- CHANGES.md >/dev/null;
-        fi
-        ;;
-      build)
-        opam pin add --no-action ocamlformat .
-        opam install --deps-only ocamlformat
-        opam switch ${OCAML_VERSION}
-        opam exec -- make
-        opam install ocamlformat
-        ;;
-      tests)
-        opam pin add --no-action ocamlformat .
-        opam install --deps-only ocamlformat
-        opam switch ${OCAML_VERSION}
-        opam exec -- make test
-        opam install ocamlformat
-        ;;
-      *)
-        echo "unknown CI kind"
-        exit 1
-        ;;
-    esac
+script: tools/travis-ci.sh

CHANGES.md

@@ -1,5 +1,6 @@
 ### (master)
 
+  + CI: use a script travis-ci.sh to simplify .travis.yml (#1063) (Guillaume Petiot)
   + Improve: allow both values of boolean options (#1062) (Jules Aguillon)
   + Improve: auto mode for break-string-literals instead of {wrap,newlines,newlines-and-wrap} (#1057) (Guillaume Petiot)
   + Improve: remove utility functions from Fmt_ast (#1059) (Guillaume Petiot)

tools/travis-ci.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+
+######################################################################
+#                                                                    #
+#                            OCamlFormat                             #
+#                                                                    #
+#  Copyright (c) 2019-present, Facebook, Inc.  All rights reserved.  #
+#                                                                    #
+#  This source code is licensed under the MIT license found in the   #
+#  LICENSE file in the root directory of this source tree.           #
+#                                                                    #
+######################################################################
+
+# Warning: this script should only be called from .travis.yml
+
+set -e
+
+CheckBuild () {
+    # before_install
+    wget -O ${HOME}/opam https://github.com/ocaml/opam/releases/download/2.0.5/opam-2.0.5-x86_64-linux
+    chmod +x ${HOME}/opam
+    export PATH=${HOME}:${PATH}
+    export OPAMYES=1
+    export OPAMJOBS=2
+    opam init --bare --disable-sandboxing
+    opam switch --dry-run ${OCAML_VERSION} 2>/dev/null || opam switch create ${OCAML_VERSION}
+    # install
+    opam switch ${OCAML_VERSION}
+    opam update --upgrade
+    opam pin add --no-action ocamlformat .
+    opam install --deps-only ocamlformat
+    # script
+    opam exec -- make
+    opam install ocamlformat
+}
+
+CheckBuildAndTests () {
+    # before_install
+    wget -O ${HOME}/opam https://github.com/ocaml/opam/releases/download/2.0.5/opam-2.0.5-x86_64-linux
+    chmod +x ${HOME}/opam
+    export PATH=${HOME}:${PATH}
+    export OPAMYES=1
+    export OPAMJOBS=2
+    opam init --bare --disable-sandboxing
+    opam switch --dry-run ${OCAML_VERSION} 2>/dev/null || opam switch create ${OCAML_VERSION}
+    # install
+    opam switch ${OCAML_VERSION}
+    opam update --upgrade
+    opam pin add --no-action ocamlformat .
+    opam install --deps-only ocamlformat
+    # script
+    opam exec -- make test
+    opam install ocamlformat
+}
+
+CheckChangesModified () {
+    if [ "$TRAVIS_PULL_REQUEST" != false ] && [ "$TRAVIS_BRANCH" = master ]
+    then
+        git diff --exit-code "$TRAVIS_BRANCH...$TRAVIS_COMMIT" -- CHANGES.md \
+            > /dev/null && exit 1 || echo pass
+    fi
+}
+
+case $CI_KIND in
+build)
+    CheckBuild
+    ;;
+build-and-tests)
+    CheckBuildAndTests
+    ;;
+changes)
+    CheckChangesModified
+    ;;
+*)
+    echo unknown CI kind
+    exit 1
+    ;;
+esac