try using 'pve-eslint' if it exists

but fallback to 'eslint' otherwise

introduce the defines.mk for this

Suggested-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

defines.mk

@@ -0,0 +1 @@
+ESLINT ?= $(if $(shell command -v pve-eslint), pve-eslint, eslint)

js/Makefile

@@ -1,3 +1,5 @@
+include ../defines.mk
+
 JSSRC=							\
 	Utils.js					\
 	FilterProxy.js					\
@@ -106,7 +108,7 @@ OnlineHelpInfo.js: /usr/bin/asciidoc-pmg
 	mv $@.tmp $@
 
 .lint-incremental: $(JSSRC)
-	eslint $?
+	$(ESLINT) $?
 	touch "$@"
 
 .PHONY: lint
@@ -114,7 +116,7 @@ lint: .lint-incremental
 
 .PHONY: check
 check: $(JSSRC)
-	eslint --strict $(JSSRC)
+	$(ESLINT) --strict $(JSSRC)
 	touch ".lint-incremental"
 
 pmgmanagerlib.js: OnlineHelpInfo.js $(JSSRC)

js/mobile/Makefile

@@ -1,3 +1,4 @@
+include ../../defines.mk
 
 # caution: order is important
 MOBILESRC=				\
@@ -10,7 +11,7 @@ MOBILESRC=				\
 	  app.js			\
 
 lint: pmgmanagerlib-mobile.js
-	eslint $^
+	$(ESLINT) $^
 
 .PHONY: check
 check: lint