Simplify CI and make it easy to get a standalone build

The number of options that needed to be set to get a proper standalone
build is fairly large. Given that it was already repeated twice in
different CI contexts it occurred to me the whole batch of settings
should just be one preset so that people can build their own standalone
version easily from the source tarball if they want.

.github/workflows/release.yml

@@ -16,20 +16,12 @@ jobs:
         run: |
           echo "VERSION=${GITHUB_REF#refs/*/v}" >> $GITHUB_ENV
           ./bootstrap.sh
-          ./configure \
-              --without-man-page \
-              --disable-tests \
-              --without-bash-completion-dir \
-              --without-zsh-completion-dir \
-              --program-suffix=-standalone.sh \
-              --with-deployment=standalone \
-              --bindir=/ \
-              COMM=comm GIT=git GREP=grep SED=sed SHELL=/bin/sh
-            make DESTDIR=. install-exec
+          ./configure --with-standalone --bindir=/
+          make DESTDIR=. install-exec
       - name: Upload standalone script artifact
         uses: actions/upload-artifact@v2
         with:
-          name: vcsh-standalone
+          name: standalone-deployment
           path: vcsh-standalone.sh
 
   ghrelase:
@@ -61,14 +53,14 @@ jobs:
       - name: Download standalone script artifact
         uses: actions/download-artifact@v2
         with:
-          name: vcsh-standalone
+          name: standalone-deployment
       - name: Publish Release
         uses: softprops/action-gh-release@v1
         with:
           body_path: changelog-HEAD
           files: |
             vcsh-${{ env.VERSION }}.zip
             vcsh-${{ env.VERSION }}.tar.xz
-            standalone/vcsh-standalone.sh
+            vcsh-standalone.sh
         env:
           GITHUB_TOKEN: ${{ github.token }}

.github/workflows/test.yml

@@ -17,20 +17,12 @@ jobs:
       - name: Configure standalone script
         run: |
           ./bootstrap.sh
-          ./configure
-            --without-man-page \
-            --disable-tests \
-            --without-bash-completion-dir \
-            --without-zsh-completion-dir \
-            --with-deployment=standalone \
-            --program-suffix=-standalone.sh \
-            --bindir=/ \
-            COMM=comm GIT=git GREP=grep SED=sed SHELL=/bin/sh
+          ./configure --with-standalone --bindir=/
           make DESTDIR=. install-exec
       - name: Post standalone script artifact
         uses: actions/upload-artifact@v2
         with:
-          name: vcsh-standalone
+          name: standalone-deployment
           path: vcsh-standalone.sh
 
   test:

configure.ac

@@ -10,6 +10,23 @@ AC_DEFUN([AX_PROGVAR], [
           test -n "$m4_toupper($1)" || AC_MSG_ERROR([m4_default($2,$1) is required])
           ])
 
+AC_ARG_WITH([standalone],
+            AS_HELP_STRING([--with-standalone],
+                           [Use configuration presets for a standalone script deployment @<:@default=no@:>@]),
+            [COMM=comm GIT=git GREP=grep SED=sed SHELL=/bin/sh
+             with_deployment=standalone
+             with_man_page=no
+             enable_tests=no
+             with_bash_completion_dir=no
+             with_zsh_completion_dir=no
+             program_suffix=-standalone.sh
+             # By this point program_suffix has already been processed so we have to redo what configure did
+             # Code copied from approx L2670-2671
+             program_transform_name="s&\$&$program_suffix&;$program_transform_name"
+             program_transform_name=`printf "%s\n" "$program_transform_name" | sed "$ac_script"`
+            ],
+            [])
+
 AC_PROG_AWK
 AC_PROG_GREP
 AC_PROG_SED

vcsh.in

@@ -17,10 +17,11 @@
 
 
 # If '.r<N>-g<SHA>' is appended to the version, you are seeing an unreleased
-# version of vcsh; the main branch is supposed to be clean at all times
-# so you can most likely just use it nonetheless
+# version built from the main branch HEAD. If "-standalone" is appended you are
+# using a version built explicitly for portability as a standalone script
+# rather than being installed to a specific system.
 VCSH_VERSION='@VERSION@@DEPLOYMENT@'; export VCSH_VERSION
-VCSH_SELF="@TRANSFORMED_PACKAGE_NAME@"; export VCSH_SELF
+VCSH_SELF='@TRANSFORMED_PACKAGE_NAME@'; export VCSH_SELF
 
 # Ensure all files created are accessible only to the current user.
 umask 0077