Switch from Travis CI to GitHub Actions

Closes #1061

Author: krobelus

.github/workflows/linux.yml

@@ -0,0 +1,32 @@
+name: Linux
+
+on: [push, pull_request]
+
+jobs:
+  ci:
+    runs-on: ubuntu-20.04
+
+    strategy:
+      matrix:
+        compiler: [clang, gcc]
+        tig_build: [autoconf, "config.make"]
+        include:
+          - name: Address Sanitizer
+            compiler: clang
+            tig_build: "address-sanitizer"
+
+          - name: Valgrind
+            compiler: gcc
+            tig_build: valgrind
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Test Tig
+        shell: 'script -q -e -c "sh {0}"' # Workaround to get a TTY, see https://github.com/gfx/example-github-actions-with-tty
+        run: |
+          set -ex
+          export LANG=en_US.utf8
+          sudo apt update
+          sudo DEBIAN_FRONTEND=noninteractive apt -yq install --no-install-recommends \
+            asciidoc valgrind xmlto
+          CC=${{ matrix.compiler }} TIG_BUILD=${{ matrix.tig_build }} tools/travis.sh

.github/workflows/macos.yml

@@ -0,0 +1,38 @@
+name: macOS
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  install:
+    runs-on: macos-latest
+
+    strategy:
+      matrix:
+        compiler: [clang, gcc]
+
+    steps:
+      - name: Patch
+        run: |
+          cd "$(brew --repo homebrew/core)" && patch -p1 <<\EOF
+          diff --git a/Formula/tig.rb b/Formula/tig.rb
+          index 2e8c125660..f76d6bca1c 100644
+          --- a/Formula/tig.rb
+          +++ b/Formula/tig.rb
+          @@ -26,9 +26,11 @@ class Tig < Formula
+             depends_on "readline"
+           
+             def install
+          +    ENV.deparallelize
+               system "./autogen.sh" if build.head?
+               system "./configure", "--prefix=#{prefix}", "--sysconfdir=#{etc}"
+               system "make"
+          +    system "make", "test"
+               # Ensure the configured `sysconfdir` is used during runtime by
+               # installing in a separate step.
+               system "make", "install", "sysconfdir=#{pkgshare}/examples"
+          EOF
+      - name: Install latest Tig
+        shell: 'script -q typescript sh {0}' # Workaround to get a TTY, see https://github.com/gfx/example-github-actions-with-tty
+        run: HOMEBREW_CC=${{ matrix.compiler }} HOMEBREW_NO_AUTO_UPDATE=1 brew install --HEAD tig

.travis.yml

@@ -2,7 +2,8 @@ Tig: text-mode interface for Git
 ================================
 :docext: adoc
 
-image:https://secure.travis-ci.org/jonas/tig.svg?branch=master[Travis Build,link=https://travis-ci.org/jonas/tig]
+image:https://github.com/jonas/tig/workflows/Linux/badge.svg[Linux CI,link=https://github.com/jonas/tig/actions?query=workflow%3A.github%2Fworkflows%2Flinux.yml]
+image:https://github.com/jonas/tig/workflows/macOS/badge.svg[macOS CI,link=https://github.com/jonas/tig/actions?query=workflow%3A.github%2Fworkflows%2Fmacos.yml]
 image:https://ci.appveyor.com/api/projects/status/jxt1uf52o7r0a8r7/branch/master?svg=true[AppVeyor Build,link=https://ci.appveyor.com/project/fonseca/tig]
 image:https://badges.gitter.im/Join%20Chat.svg[Join Chat,link="https://gitter.im/jonas/tig?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"]
 

README.adoc

@@ -812,7 +812,7 @@ run_test_cases()
 			tigrc "$(cat < "$name-tigrc")"
 		fi
 		if [ -e "$name-before" ]; then
-			test_exec_work_dir "$SHELL" "$HOME/$name-before"
+			test_exec_work_dir "${SHELL:-/bin/sh}" "$HOME/$name-before"
 		fi
 		(
 			if [ -e "$name-cwd" ]; then
@@ -828,7 +828,7 @@ run_test_cases()
 			test_tig $(if [ -e "$name-args" ]; then cat < "$name-args"; fi)
 		)
 		if [ -e "$name-after" ]; then
-			test_exec_work_dir "$SHELL" "$HOME/$name-after"
+			test_exec_work_dir "${SHELL:-/bin/sh}" "$HOME/$name-after"
 		fi
 
 		assert_equals "$name.screen" < "$name.expected"