From 0419c55271e5c6e330bf7c4a08929ef4e55811d4 Mon Sep 17 00:00:00 2001
From: mark <markm@cs.wisc.edu>
Date: Mon, 5 Oct 2020 13:23:14 -0500
Subject: [PATCH] linkcheck only for changed files except in cron jobs

---
 .travis.yml     |  2 +-
 book.toml       |  1 +
 ci/linkcheck.sh | 20 ++++++++++++++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100755 ci/linkcheck.sh

diff --git a/.travis.yml b/.travis.yml
index fba5ab87..3e4a3dc0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ before_install:
 install:
 - source ~/.cargo/env || true
 - cargo install mdbook --version '^0.4.3'
-- cargo install mdbook-linkcheck --version '^0.7.0'
+- cargo install mdbook-linkcheck --git https://github.com/Michael-F-Bryan/mdbook-linkcheck
 script:
 - git checkout -b ci
 - git rebase origin/master
diff --git a/book.toml b/book.toml
index 10bc2edd..af909446 100644
--- a/book.toml
+++ b/book.toml
@@ -14,6 +14,7 @@ enable = true
 level = 0
 
 [output.linkcheck]
+command = "../../ci/linkcheck.sh"
 follow-web-links = true
 exclude = [ "crates\\.io", "gcc\\.godbolt\\.org", "youtube\\.com", "youtu\\.be", "dl\\.acm\\.org", "cs\\.bgu\\.ac\\.il", "www\\.amazon\\.com", "www\\.rustaceans\\.org" ]
 cache-timeout = 86400
diff --git a/ci/linkcheck.sh b/ci/linkcheck.sh
new file mode 100755
index 00000000..85573314
--- /dev/null
+++ b/ci/linkcheck.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+if [ "$TRAVIS_EVENT_TYPE" = "cron" ] ; then # running in cron job
+  FLAGS=""
+
+  echo "Doing full link check."
+elif [ "$CI" = "true" ] ; then # running in PR CI build
+  CHANGED_FILES=$(git diff --name-only $TRAVIS_COMMIT_RANGE | tr '\n' ' ')
+  FLAGS="-f $CHANGED_FILES"
+
+  echo "Checking files changed in $TRAVIS_COMMIT_RANGE: $CHANGED_FILES"
+else # running locally
+  COMMIT_RANGE=master...
+  CHANGED_FILES=$(git diff --name-only $COMMIT_RANGE | tr '\n' ' ')
+  FLAGS="-f $CHANGED_FILES"
+
+  echo "Checking files changed in $COMMIT_RANGE: $CHANGED_FILES"
+fi
+
+exec mdbook-linkcheck $FLAGS -- $TRAVIS_BUILD_DIR