* Have Composer in `tools/composer` and managed through `composer self-update`

* Install Psalm using Phive as `tools/psalm`
* Install PHP-CS-Fixer using Phive as `tools/php-cs-fixer`

.gitattributes

@@ -0,0 +1,4 @@
+/tools      export-ignore
+/tools/*    binary
+
+*.php diff=php

.travis.yml

@@ -7,12 +7,8 @@ php:
   - 7.3
   - 7.4
 
-before_install:
-  - composer self-update
-  - composer clear-cache
-
 install:
-  - travis_retry composer update --no-interaction --no-ansi --no-progress --no-suggest --optimize-autoloader --prefer-stable
+  - travis_retry ./tools/composer update --no-interaction --no-ansi --no-progress --no-suggest --optimize-autoloader --prefer-stable
 
 script:
   - ./vendor/bin/phpunit --coverage-clover=coverage.xml

build.xml

@@ -1,19 +1,31 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project name="exporter" default="setup">
- <target name="setup" depends="clean,composer"/>
+    <target name="setup" depends="clean,install-dependencies"/>
 
- <target name="clean" description="Cleanup build artifacts">
-  <delete dir="${basedir}/vendor"/>
-  <delete file="${basedir}/composer.lock"/>
- </target>
+    <target name="clean" description="Cleanup build artifacts">
+        <delete dir="${basedir}/vendor"/>
+        <delete file="${basedir}/composer.lock"/>
+    </target>
 
- <target name="composer" depends="clean" description="Install dependencies with Composer">
-  <exec executable="composer" taskname="composer">
-   <arg value="update"/>
-   <arg value="--no-interaction"/>
-   <arg value="--no-progress"/>
-   <arg value="--no-ansi"/>
-   <arg value="--no-suggest"/>
-  </exec>
- </target>
+    <target name="install-dependencies" depends="clean" description="Install dependencies with Composer">
+        <exec executable="${basedir}/tools/composer" taskname="composer">
+            <arg value="update"/>
+            <arg value="--no-interaction"/>
+            <arg value="--no-progress"/>
+            <arg value="--no-ansi"/>
+            <arg value="--no-suggest"/>
+        </exec>
+    </target>
+
+    <target name="update-tools">
+        <exec executable="phive" taskname="phive">
+            <arg value="--no-progress"/>
+            <arg value="update"/>
+        </exec>
+
+        <exec executable="${basedir}/tools/composer" taskname="composer">
+            <arg value="self-update"/>
+        </exec>
+    </target>
 </project>
+

phive.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phive xmlns="https://phar.io/phive">
+  <phar name="php-cs-fixer" version="^2.16" installed="2.16.1" location="./tools/php-cs-fixer" copy="true"/>
+  <phar name="psalm" version="^3.8" installed="3.8.3" location="./tools/psalm" copy="true"/>
+</phive>