Add script to update orphan gh-pages branch

Author: felixmulder

.drone.yml

@@ -6,6 +6,23 @@ pipeline:
       - ln -s /var/cache/drone/scala-scala scala-scala
       - ./scripts/update-scala-library
       - sbt -J-Xmx4096m -J-XX:ReservedCodeCacheSize=512m -J-XX:MaxMetaspaceSize=1024m -Ddotty.drone.mem=4096m -ivy /var/cache/drone/ivy2 "${TEST}"
+    when:
+      branch:
+        exclude: gh-pages
+
+  documentation:
+    image: lampepfl/dotty:latest
+    pull: true
+    commands:
+      - ./project/scripts/genDocs "${TEST}" $BOT_PASS
+    when:
+      branch: master
+
+  slack:
+    image: plugins/slack
+    channel: dotty
+    when:
+      branch: master
 
 matrix:
   TEST:

.drone.yml.sig

@@ -0,0 +1 @@
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project/scripts/genDocs

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+
+# Usage: ./genDocs <test variable> <dotty-bot password>
+
+set -e
+# set extended glob, needed for rm everything but x
+shopt -s extglob
+
+if [ "$1" = "test" ]; then
+
+    # make sure that BOT_PASS is set
+    if [ -z ${2+x} ]; then
+        echo "BOT_PASS unset, unable to push without password" 1>&2
+        exit 1
+    else
+        BOT_PASS=$2
+    fi
+
+    echo "Working directory: $PWD"
+
+    # this command will generate docs in $PWD/docs/_site
+    sbt -J-Xmx4096m \
+        -J-XX:ReservedCodeCacheSize=512m \
+        -J-XX:MaxMetaspaceSize=1024m \
+        -Ddotty.drone.mem=4096m \
+        -ivy /var/cache/drone/ivy2 \
+        "genDocs"
+
+    # make sure that the previous command actually succeeded
+    if [ ! -d "$PWD/docs/_site" ]; then
+        echo "Output directory did not exist: $PWD/docs/_site" 1>&2
+        exit 1
+    fi
+
+    # save current head for commit message in gh-pages
+    GIT_HEAD=$(git rev-parse HEAD)
+
+    # check out correct branch
+    git fetch origin gh-pages:gh-pages
+    git checkout gh-pages
+
+    # move newly generated _site dir to $PWD
+    mv $PWD/docs/_site .
+
+    # remove everything BUT _site dir
+    rm -rf !(_site)
+
+    # copy new contents to $PWD
+    mv _site/* .
+
+    # remove now empty _site dir
+    rm -rf _site
+
+    # set github credentials
+    git config user.name "dotty-bot"
+    git config user.email "felix.mulder@epfl.ch"
+
+    # add all contents of $PWD to commit
+    git add -A
+    git commit -m "Update gh-pages site for $GIT_HEAD"
+
+    # push using dotty-bot to origin
+    git push https://dotty-bot:$BOT_PASS@github.com/lampepfl/dotty.git
+else
+    # wrong parameter passed, should only generate docs if argument is "test"
+    # to avoid multiple site gens
+    echo "Not generating docs for $1"
+fi