BUG: Fix docs build broken link check bug

Author: kernc

.github/workflows/ci.yml

@@ -53,4 +53,4 @@ jobs:
         run: time catchsegv python -m backtesting.test
 
       - if: matrix.test-type == 'docs'
-        run: time catchsegv doc/build.sh
+        run: time catchsegv bash doc/build.sh

doc/build.sh

@@ -71,13 +71,15 @@ echo
 echo 'Testing for broken links'
 echo
 pushd "$BUILDROOT" >/dev/null
+tree .
 WEBSITE='https://kernc\.github\.io/backtesting\.py'
 grep -PR '<a .*?href=' |
     sed -E "s/:.*?<a .*?href=([\"'])(.*?)/\t\2/g" |
     tr "\"'" '#' |
     cut -d'#' -f1 |
     sort -u -t$'\t' -k 2 |
     sort -u |
+    tee >(cat 1>&2) |
     python -c '
 import sys
 from urllib.parse import urljoin
@@ -90,9 +92,12 @@ for line in sys.stdin.readlines():
     grep -v $'\t''$' |
     while read -r line; do
         while IFS=$'\t' read -r file url; do
-            url=$(python -c 'import html, sys; print(html.unescape(sys.argv[-1]))' "$url")
-            [ -f "$url" ] ||
-                curl --silent --fail --retry 5 --retry-delay 5 --user-agent 'Mozilla/5.0 Firefox 61' "$url" >/dev/null 2>&1 ||
+            target_file="$(python -c 'import html, sys; print(html.unescape(sys.argv[-1]))' "$url")"
+            echo "$target_file"
+            if [ -f "$target_file" ]; then continue; fi
+
+            url="${url// /%20}"
+            curl --silent --fail --retry 5 --retry-delay 5 --user-agent 'Mozilla/5.0 Firefox 61' "$url" >/dev/null 2>&1 ||
                 die "broken link in $file:  $url"
         done
     done