Update version to 2.0.12.

Fix segfault when running non-existent macros.
Fix file-glob command `~ep'.
Require prefix `~' before file-glob (e.g., fn => ~fn) commands.
Add file-glob test.
Add GitHub CI action.

.github/workflows/ed.yml

@@ -0,0 +1,20 @@
+name: Build/Test
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        OS: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v2
+      - name: configure
+        run: ./configure --enable-all-extensions --with-included-regex
+      - name: make
+        run: make
+      - name: make check
+        run: make check

README.md

@@ -1,18 +1,24 @@
-[![Build Status](https://travis-ci.com/slewsys/ed.svg?branch=master)](https://travis-ci.com/slewsys/ed)
+![Build Status](https://github.com/slewsys/ed/actions/workflows/ed.yml/badge.svg)
 
 Ed is an implementation of the Unix line editor. It is 8-bit clean
 with 64-bit addressing and the only open source implementation that
 scores 100% on The Open Group's POSIX-compliance tests.
 
-Ed also provides a handful of useful extensions to the SUSv4 standard,
-as described in the file _doc/SUSv4_.
+Ed optionally provides several extensions to the SUSv4 standard
+as described in [doc/SUSv4](https://github.com/slewsys/ed/blob/main/doc/SUSv4.md).
 
-Brian W. Kernighan's ed tutorials are included courtesy of Lucent
-Laboratories. See _doc/bwk/_ or, from within ed, type:
+It builds and tests successfully across many systems and hardware
+platforms.
 
-  !info ed RET m tutorial RET
+Brian W. Kernighan's `ed` tutorials are included courtesy of _Lucent
+Laboratories_. These are available as PDFs, info documents and NROFF
+manuscripts.  See _doc/bwk/_ or, from within `ed`, type:
 
-The ed algorithm is described in Kernighan and Plauger's book
+```ed
+!info ed RET m tutorial RET
+```
+
+The `ed` algorithm is described in Kernighan and Plauger's book
 _Software Tools in Pascal_, Addison-Wesley, 1981.
 
 Please submit issues or pull requests to: <https://github.com/slewsys/ed>

configure

@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for ed 2.0.11.
+# Generated by GNU Autoconf 2.69 for ed 2.0.12.
 #
 # Report bugs to <https://github.com/slewsys/ed>.
 #
@@ -590,8 +590,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='ed'
 PACKAGE_TARNAME='ed'
-PACKAGE_VERSION='2.0.11'
-PACKAGE_STRING='ed 2.0.11'
+PACKAGE_VERSION='2.0.12'
+PACKAGE_STRING='ed 2.0.12'
 PACKAGE_BUGREPORT='https://github.com/slewsys/ed'
 PACKAGE_URL=''
 
@@ -2023,7 +2023,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures ed 2.0.11 to adapt to many kinds of systems.
+\`configure' configures ed 2.0.12 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -2094,7 +2094,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of ed 2.0.11:";;
+     short | recursive ) echo "Configuration of ed 2.0.12:";;
    esac
   cat <<\_ACEOF
 
@@ -2246,7 +2246,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-ed configure 2.0.11
+ed configure 2.0.12
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -2960,7 +2960,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by ed $as_me 2.0.11, which was
+It was created by ed $as_me 2.0.12, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -5869,7 +5869,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='ed'
- VERSION='2.0.11'
+ VERSION='2.0.12'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -31631,7 +31631,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by ed $as_me 2.0.11, which was
+This file was extended by ed $as_me 2.0.12, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -31697,7 +31697,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-ed config.status 2.0.11
+ed config.status 2.0.12
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 

configure.ac

@@ -5,7 +5,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.69])
-AC_INIT([ed],[2.0.11],[https://github.com/slewsys/ed])
+AC_INIT([ed],[2.0.12],[https://github.com/slewsys/ed])
 AC_CONFIG_AUX_DIR([.])
 AC_CONFIG_SRCDIR([config.h.in])
 AC_CONFIG_HEADERS([config.h])