Basic build system guessing and some code fixes in mksm script

mksm

@@ -22,6 +22,9 @@ set -e
 # Date format
 filedate="$(date +%Y%m%d%H%M%S)"
 
+# Store PWD as currentdir
+currentdir="$PWD"
+
 # Function to generate usage options
 mkusage() {
    cat << EOF
@@ -35,6 +38,16 @@ supports generation of build files for sources that support compilation using:
 
 Usage: mksm -a <app_name> -v <app_version> -b <build_system>
 
+Options:
+    -a : Application name. This option is REQUIRED.
+
+    -b : Build system used by the package. This option is REQUIRED.
+
+    -h : Show this usage and exit.
+
+    -v : Application version. This option is REQUIRED.
+
+
 **You must be inside the directory containing source tarball when running mksm.**. 
 For example if you want to build glib 2.60.0, 
 
@@ -45,7 +58,7 @@ $ ls
 glib-2.60.0.tar.xz
 ...
 
-$ mksm -a 'glib' -v '2.60.0' -b 'meson'
+$ mksm -a glib -v 2.60.0 -b meson
 
 EOF
 exit 0
@@ -54,8 +67,8 @@ exit 0
 # Generate sha512sums in the build file
 gensha512sums() {
   echo "[INFO] Adding new sha512sums in $appname.SMBuild..."
-  printf '\n' >> "$appname".SMBuild
-  printf 'sha512sums="\n' >> "$appname".SMBuild
+  printf '\n' >> "$currentdir/$appname".SMBuild
+  printf 'sha512sums="\n' >> "$currentdir/$appname".SMBuild
 
   # File types
   files=( *.tar.* *.zip *.t?z *.patch *.diff *.c *.h )
@@ -111,15 +124,17 @@ fi
 appname="$envappname"
 version="$envversion"
 
+buildfile="$currentdir/$appname.SMBuild"
+
 # Use case/esac to determine the value of envbuildsys supplied to us. If it isn't what's expected, throw an error and exit.
 case "$envbuildsys" in 
-  "autoconf"|"make"|"cmake"|"meson")
+  "autoconf"|"make"|"cmake"|"meson"|"guess")
   buildsys="$envbuildsys" ;;
-  *) echo "[ERROR] Unknown build system. Try 'make', 'cmake', 'autoconf' or 'meson'" ; exit 1 ;;
+  *) echo "[ERROR] Unknown build system. Try 'autoconf', 'make', 'cmake', 'meson' or 'guess'" ; exit 1 ;;
 esac
 
 gen_autoconf() {
-  cat << 'EOF' >> $appname.SMBuild
+  cat << 'EOF' >> $buildfile
   ./configure \
     --prefix="" \
     --sysconfdir=/etc
@@ -127,7 +142,7 @@ gen_autoconf() {
   make 
   make install DESTDIR=$pkg
 
-  cp LICENSE $pkgdocs/
+  cp COPYING $pkgdocs/
 
   mkfinalpkg
 }
@@ -137,7 +152,7 @@ EOF
 
 # Function for creating "make" template
 gen_make() {
-  cat << 'EOF' >> $appname.SMBuild
+  cat << 'EOF' >> $buildfile
   make
   make install DESTDIR=$pkg
 
@@ -151,7 +166,7 @@ EOF
 
 # Function for creating "cmake" template
 gen_cmake() {
-  cat << 'EOF' >> $appname.SMBuild
+  cat << 'EOF' >> $buildfile
   mkdir smbuild && cd smbuild
   cmake .. \
     -DCMAKE_INSTALL_PREFIX="/" \
@@ -172,7 +187,7 @@ EOF
    
 # Function for creating "meson" template"
 gen_meson() {
-  cat << 'EOF' >> $appname.SMBuild
+  cat << 'EOF' >> $buildfile
   mkdir smbuild && cd smbuild
   meson .. \
     --prefix="/" 
@@ -188,23 +203,45 @@ gen_meson() {
 EOF
 }
 
+gen_guess() {
+  echo "Trying to guess build system..."
+  mkdir -p tmp.dir && cd tmp.dir
+  tar xf "$currentdir/$appname-$version".tar.?z
+  if [[ -d $appname-$version ]] ; then
+    cd $appname-$version
+    if [[ -f configure ]] || [[ -f configure.ac ]] ; then
+      echo "Looks like autoconf system..."
+      gen_autoconf
+    elif [[ -f Makefile ]] ; then
+      echo "Looks like simple Makefile..."
+      gen_make
+    fi
+  else
+    echo "Non-standard directory. Perhaps you might want to provide a definitive build system"
+    echo "instead of guessing?"
+    cd $currentdir
+    rm -rf tmp.dir
+  fi
+}
+
+
 echo "[INFO] Generating build file for application '"$appname"' version '"$version"' which uses build system '"$buildsys"'..."
 echo ""
 echo "[INFO] Current directory is $PWD"
 echo ""
 
 # Copy the sample build file based on the build system argument passed
-if [[ -f $appname.SMBuild ]] ; then
+if [[ -f $buildfile ]] ; then
   echo "[INFO] Found an existing $appname.SMBuild in the current directory." 
   echo "[INFO] Backing it up inside a directory 'old' and creating a new one here." 
   mkdir -p old
-  mv "$appname.SMBuild" old/"$appname.SMBuild.$filedate"
+  mv "$buildfile" old/"$buildfile.$filedate"
 fi
    
 # This one came in handy:
 # https://unix.stackexchange.com/questions/505949/expanding-only-certain-variables-inside-a-heredoc
 # Expand variables in this heredoc
-cat << EOF > $appname.SMBuild
+cat << EOF > $buildfile
 app=$appname
 version=$version
 build=1sml
@@ -215,7 +252,7 @@ requires="musl"
 EOF
    
 # Single-quoted 'EOF' prevents variables from being expanded in this heredoc
-cat << 'EOF' >> $appname.SMBuild
+cat << 'EOF' >> $buildfile
    
 build() {
   mkandenterbuilddir
@@ -232,12 +269,12 @@ case "$buildsys" in
   make) gen_make ;;
   cmake) gen_cmake ;;
   meson) gen_meson ;;
+  guess) gen_guess ;;
 esac
 
-chmod +x $appname.SMBuild
+chmod +x $buildfile
 echo "...done"
 echo ""
 
 # Generate SHA512 checksums and exit
 gensha512sums
-exit 0