Improvements to script to regenerate doxygen docs.

- The default is actually "html" not "all", so fix comment to match
  reality.
- A shell script is run in a sub-shell, and the parent's current
  directory won't be affected, so it's pointless (and confusing) to
  try to restore it at the end of the script.
- Remove trailing ";" from "export FOO=bar;" - it's not required,
  though is valid (it means every "export" is followed by an empty
  statement).
- After adjusting doxygen.log, simply use "mv" to replace the
  original, rather than "cat" then "rm".

Fixes #17001

docs/doxygen/regen.sh

@@ -9,16 +9,14 @@
 #    ./regen.sh [html|chm|xml|latex|all]
 #
 # Pass "x" to regen only the X output format and "all" to regen them all.
-# If no arguments are passed all formats are regenerated
+# If no arguments are passed, HTML is regenerated (just like passing "html").
-# (just like passing "all").
 #
 
 
-# remember current folder and then cd to the docs/doxygen one
+# cd to the directory this script is in
 me=$(basename $0)
 path=${0%%/$me}        # path from which the script has been launched
-current=$(pwd)
+cd "$path"
-cd $path
 if [[ -z "$WXWIDGETS" ]]; then
     # Notice the use of -P to ensure we get the canonical path even if there
     # are symlinks in the current path. This is important because Doxygen
@@ -59,48 +57,48 @@ mkdir -p out/html/generic
 cp images/generic/*png out/html/generic
 
 # Defaults for settings controlled by this script
-export GENERATE_DOCSET="NO";
+export GENERATE_DOCSET="NO"
-export GENERATE_HTML="NO";
+export GENERATE_HTML="NO"
-export GENERATE_HTMLHELP="NO";
+export GENERATE_HTMLHELP="NO"
-export GENERATE_LATEX="NO";
+export GENERATE_LATEX="NO"
-export GENERATE_QHP="NO";
+export GENERATE_QHP="NO"
-export GENERATE_XML="NO";
+export GENERATE_XML="NO"
-export SEARCHENGINE="NO";
+export SEARCHENGINE="NO"
-export SERVER_BASED_SEARCH="NO";
+export SERVER_BASED_SEARCH="NO"
 
 # Which format should we generate during this run?
 case "$1" in
     all) # All *main* formats, not all formats, here for backwards compat.
-        export GENERATE_HTML="YES";
+        export GENERATE_HTML="YES"
-        export GENERATE_HTMLHELP="YES";
+        export GENERATE_HTMLHELP="YES"
-        export GENERATE_XML="YES";
+        export GENERATE_XML="YES"
         ;;
     chm)
-        export GENERATE_HTML="YES";
+        export GENERATE_HTML="YES"
-        export GENERATE_HTMLHELP="YES";
+        export GENERATE_HTMLHELP="YES"
         ;;
     docset)
-        export GENERATE_DOCSET="YES";
+        export GENERATE_DOCSET="YES"
-        export GENERATE_HTML="YES";
+        export GENERATE_HTML="YES"
         ;;
     latex)
-        export GENERATE_LATEX="YES";
+        export GENERATE_LATEX="YES"
         ;;
     php) # HTML, but with PHP Search Engine
-        export GENERATE_HTML="YES";
+        export GENERATE_HTML="YES"
-        export SEARCHENGINE="YES";
+        export SEARCHENGINE="YES"
-        export SERVER_BASED_SEARCH="YES";
+        export SERVER_BASED_SEARCH="YES"
         ;;
     qch)
-        export GENERATE_HTML="YES";
+        export GENERATE_HTML="YES"
-        export GENERATE_QHP="YES";
+        export GENERATE_QHP="YES"
         ;;
     xml)
-        export GENERATE_XML="YES";
+        export GENERATE_XML="YES"
         ;;
     *) # Default to HTML only
-        export GENERATE_HTML="YES";
+        export GENERATE_HTML="YES"
-        export SEARCHENGINE="YES";
+        export SEARCHENGINE="YES"
         ;;
 esac
 
@@ -201,8 +199,4 @@ fi
 currpath=`pwd`/
 interfacepath=`cd ../../interface && pwd`/
 cat doxygen.log | sed -e "s|$currpath||g" -e "s|$interfacepath||g" > temp
-cat temp > doxygen.log
+mv temp doxygen.log
-rm temp
-
-# return to the original folder from which this script was launched
-cd $current