configure: implement --yarn

Makefile

@@ -53,7 +53,7 @@ lint: tsc yarn-install
 
 .PHONY: yarn-install
 yarn-install:
-	yarn install
+	$(yarnexe) install
 
 
 .PHONY: i18n

configure

@@ -87,19 +87,22 @@ else
     fi
 fi
 
-if ! existence yarn; then
-    echo 'ERROR: yarn missing. See https://yarnpkg.com/en/docs/install'
-    exit 1
-fi
-
-if existence cmdtest; then
+if existence yarn; then
     if yarn help | grep "No such file or directory"; then
         echo "ERROR: wrong yarn binary installed, please remove the"
         echo "ERROR: conflicting binary before continuing."
+        if existence cmdtest; then
+            echo "WARNING: cmdtest is installed, this can lead"
+            echo "WARNING: to know issues with yarn."
+        fi
         exit 1
     fi
-    echo "WARNING: cmdtest is installed, this can lead to known issues"
-    echo "WARNING: with yarn."
+    myyarn="yarn"
+elif existence yarnpkg; then
+    myyarn="yarnpkg"
+else
+    echo 'ERROR: yarn missing. See https://yarnpkg.com/en/docs/install'
+    exit 1
 fi
 
 # for the weird systems and sandboxes, only as a anotice.
@@ -119,4 +122,4 @@ fi
 # If $1 is empty, the python script checks the
 # environment for PREFIX. We might need more
 # variables and switches, such as DESTDIR.
-$PYTHON ./configure.py $@
+$PYTHON ./configure.py --yarn=$myyarn $@

configure.py

@@ -44,26 +44,36 @@ def _read_prefix():
             return myprefix
 
     else:
-        logger.debug('PREFIX from argv')
+        # logger.debug('PREFIX from argv')
         parser = argparse.ArgumentParser()
         parser.add_argument("-p",
                             "--prefix",
                             type=str,
                             required=True,
                             help='Directory prefix for installation')
-        logger.debug('parser.parse_args step')
+        parser.add_argument("-y",
+                            "--yarn",
+                            type=str,
+                            required=True,
+                            help='name of yarn executable')
+        # logger.debug('parser.parse_args step')
         args = parser.parse_args()
-        logger.debug('%s', args)
+        # logger.debug('%s', args)
         myprefix = args.prefix
+        yarnexe = args.yarn
         # if args.prefix is not None and os.path.isdir(myprefix) is True:
         if args.prefix and os.path.isdir(myprefix) is True:
-            return myprefix
+            return [myprefix, yarnexe];
 
 def main():
-    myprefix = str(_read_prefix())
+    # mylist = str(_read_prefix())
+    mylist = _read_prefix()
+    myprefix = mylist[0]
+    yarnexe = mylist[1]
     f = open('config.mk', 'w+')
     f.write('# this file is autogenerated by ./configure\n')
     f.write('prefix=' + myprefix + '\n')
+    f.write('yarnexe=' + yarnexe + '\n')
     f.close()