Use some version checking on generator scripts, preventing a full rebuild on every build

scripts/gen_manpage.sh

@@ -1,10 +1,13 @@
 #! /bin/bash
 # Used to a man page from markdown
 
-echo ".\" Man page for the ttrts project" > $4
+FILE="$4"
-echo ".\" this man page is auto-generated, do not edit directly" >> $4
+TEMP="$FILE.tmp"
 
-echo ".TH TTRTS\ v$1.$2.$3 6 $(date +%Y-%m-%d) http://mdiluz.github.io/ttrts/" >> $4
+echo ".\" Man page for the ttrts project" > $TEMP
+echo ".\" this man page is auto-generated, do not edit directly" >> $TEMP
+
+echo ".TH TTRTS\ v$1.$2.$3 6 $(date +%Y-%m-%d) http://mdiluz.github.io/ttrts/" >> $TEMP
 
 # NOTE: For the OSX version of sed we use -E, which on linux appears be an undocumented switch for -r
 # we also have to use [A-Za-z] instead of \w for some reason
@@ -32,4 +35,9 @@ cat "$5" \
  | sed -E 's/-----+//g'  	            		        \
  | sed -E 's/`(.*)`/\\fB\1\\fR/g'  	                    \
  | sed -E 's/MAPFILE/\\fImapfile\\fR/g'  	            \
- | sed -E 's/	ttrts -/	ttrts \\-/g'   		>> $4
+ | sed -E 's/	ttrts -/	ttrts \\-/g'   		>> $TEMP
+
+
+if [ ! -e $FILE ] || [ ! -z $( diff $FILE $TEMP ) ]; then
+	mv -f $TEMP $FILE
+fi

scripts/gen_usage.sh

@@ -1,10 +1,18 @@
 #! /bin/bash
 # Used to generate usage text from markdown
 
+FILE="$1"
+TEMP="${FILE}_tmp"
+
 cat README.md                        \
     | sed -E 's/^#+ //g'               \
     | sed -E 's/^	/\\t/g'              \
     | sed -E 's/^    /\\t/g'            \
     | sed -E 's/^/\"/'                  \
     | sed -E 's/$/\\n\"/'               \
-    > $1
+    > $TEMP
+
+# If no difference
+if [ ! -e $FILE ] || [ ! -z "$( diff $TEMP $FILE )" ]; then
+	mv -f $TEMP $FILE
+fi

scripts/gen_version_header.sh

@@ -10,4 +10,9 @@ HEADER="// Auto generated ttrts version header
 
 #endif //_TTRTS_VERSION_H_"
 
-echo "$HEADER" > "version.h"
+echo "$HEADER" > "version.h.tmp"
+
+# If no difference
+if [ ! -e version.h ] || [ ! -z $( diff version.h version.h.tmp ) ]; then
+	mv -f version.h.tmp version.h
+fi