fix dummy bash issues of the build script

manual_build.sh

-#!/bin/sh
+#!/bin/bash
 #set -x
 
 # Available manuals
@@ -34,6 +34,13 @@ DRAFT=${x_p}
 VER_NUM=${x_r}
 CMP_NAM=$1
 
+# Default case for Linux sed, just use "-i"
+sedi=(-i)
+case "$(uname)" in
+  # For macOS, use two parameters
+  Darwin*) sedi=(-i "")
+esac
+
 ## Initialisation
 ##---------------
 
@@ -50,7 +57,7 @@ else
 fi
 
 # Version
-version=`git symbolic-ref -q --short HEAD || git describe --tags --exact-match || "orphan"`
+version=`git symbolic-ref -q --short HEAD || git describe --tags --exact-match || echo "orphan"`
 if [ "x${VER_NUM}" != 'x' ] ; then
     version=${VER_NUM}
 fi
@@ -66,7 +73,7 @@ echo "Compiling ${models} manual(s) at version ${version} ${draft_opt} \n"
 # Set version
 version=`echo $version | sed -e 's;_;\\\\\\\_;g'`
 prefile="latex/global/preamble.tex"
-sed -i '' -e "s;\\\def\\\ver.*;\\\def\\\ver{$version};" ${prefile}
+sed "${sedi[@]}" -e "s;\\\def\\\ver.*;\\\def\\\ver{$version};" ${prefile}
 
 # Set draft mode
 docfile="latex/global/document.tex"
@@ -75,11 +82,11 @@ pkgfile="latex/global/packages.tex"
 draft_opt=`grep draft $docfile`
 pkg_dft=`grep draftwatermark $pkgfile | sed -e "s;%;;g"`
 if [ $ifdraft == 1 ] && [ "x$draft_opt" == "x" ] ; then
-   sed -i '' -e "s;,abstract;,abstract,draft;" $docfile
-   sed -i '' -e "s;.*draftwatermark.*;\\$pkg_dft;" $pkgfile
+   sed "${sedi[@]}" -e "s;,abstract;,abstract,draft;" $docfile
+   sed "${sedi[@]}" -e "s;.*draftwatermark.*;\\$pkg_dft;" $pkgfile
 elif [ $ifdraft == 0 ] && [ "x$draft_opt" != "x" ] ; then
-   sed -i '' -e "s;abstract,draft;abstract;" $docfile
-   sed -i '' -e "s;.*draftwatermark.*;%\\$pkg_dft;" $pkgfile
+   sed "${sedi[@]}" -e "s;abstract,draft;abstract;" $docfile
+   sed "${sedi[@]}" -e "s;.*draftwatermark.*;%\\$pkg_dft;" $pkgfile
 fi
 
 # Echo current font path
@@ -89,7 +96,6 @@ echo "Fontawesome path is $fontawesome \n"
 # Source shared functions
 . tools/shr_func.sh
 
-
 ## Check dependancies
 ##-------------------