Merge pull request #395 from zyga/master

Add snapcraft packaging

snapcraft.yaml

@@ -0,0 +1,27 @@
+name: janet
+adopt-info: janet
+summary: functional and imperative programming language and bytecode interpreter
+description: |
+    **Janet** is a functional and imperative programming language and bytecode interpreter. It is a
+    modern lisp, but lists are replaced
+    by other data structures (arrays, tables (hash table), struct (immutable hash table), tuples).
+    The language also supports bridging to native code written in C, meta-programming with macros, and bytecode assembly.
+base: core18
+confinement: classic
+grade: stable
+apps:
+    janet:
+        command: usr/bin/janet
+        adapter: none
+    jpm:
+        command: usr/bin/jpm
+        adapter: none
+parts:
+    janet:
+        plugin: make
+        source: .
+        make-parameters: [PREFIX=/usr]
+        build-packages: [build-essential]
+        override-build: |
+            snapcraftctl build
+            snapcraftctl set-version "$($SNAPCRAFT_PART_INSTALL/usr/bin/janet -e '(print "Version: " janet/version)' | awk '{ print $2 }')"