add script for generating a standalone zipapp

Makefile

@@ -0,0 +1,12 @@
+etc/_rsstail:
+	compgen.py zsh > $@
+
+etc/rsstail.sh:
+	compgen.py bash > $@
+
+compgen: etc/_rsstail etc/rsstail.sh
+
+rsstail.pyz:
+	./pyzgen.sh $@
+
+PHONY: standalone compgen

pyzgen.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+set -xeu
+
+# Bundles feedparser and rsstail into a stand-alone, executable zip file.
+# Usage: pyzgen.sh [<destination.pyz>]
+
+DESTFILE="${1:-./rsstail.pyz}"
+DESTFILE=$(readlink -f "$DESTFILE")
+PYZEXCLUDE="\*__pycache__ \*.pyo \*.pyc feedparser-\*"
+FEEDPARSER_URL="https://warehouse.python.org/packages/source/f/feedparser/feedparser-5.1.3.tar.gz"
+
+#-----------------------------------------------------------------------------
+BUILDDIR=$(mktemp -d)
+trap "rm -rf $BUILDDIR" EXIT
+
+#-----------------------------------------------------------------------------
+curl "$FEEDPARSER_URL" | tar -xz -C "$BUILDDIR"
+cp -r ./rsstail "$BUILDDIR"
+cp "$BUILDDIR"/feedparser-*/feedparser/feedparser.py "$BUILDDIR/rsstail/feedparser2.py"
+cp "$BUILDDIR"/feedparser-*/feedparser/feedparser.py "$BUILDDIR/rsstail/feedparser3.py"
+2to3 "$BUILDDIR/rsstail/feedparser3.py"
+
+#-----------------------------------------------------------------------------
+cat > "$BUILDDIR/__main__.py" <<EOF
+#!/usr/bin/env python
+# -*- coding: utf-8; -*-
+
+import sys
+if sys.version_info < (3,0):
+    import rsstail.feedparser2
+    sys.modules['feedparser'] = rsstail.feedparser2
+else:
+    import rsstailfeedparser3
+    sys.modules['feedparser'] = rsstail.feedparser3
+
+from rsstail.main import main
+if __name__ == '__main__':
+    main()
+EOF
+
+
+#-----------------------------------------------------------------------------
+[ -e "$DESTFILE" ] && rm -f "$DESTFILE"
+(cd "$BUILDDIR" && eval zip -9 -r "$DESTFILE" . -x "$PYZEXCLUDE" )
+sed -i '1i#!/usr/bin/env python' "$DESTFILE"
+chmod +x "$DESTFILE"