tools: add a xkbcli tool as entry point for the various tools we have

This is the base tool, no subtools are currently connected so you only get help
and version for now. The goal here is to have a git-like infrastructure where
/usr/bin/xkbcli is the main tool, anything else will hide in libexec.

The infrastructure for this is copied from libinput. Tools themselves will
will be installed in $prefix/libexec/xkbcommon and the xkbcli tool forks
off whatever argv[1] is after modifying the PATH to include the libexec dir.

libinput has additional code for checking whether we're running this from the
builddir but it's a bit iffy and it's usefulness is limited - if you're in the
builddir anyway you can just run ./builddir/xkbcli-<toolname> directly.
So for this code here, running ./builddir/xkbcli <toolname> will execute the
one in the prefix/libexecdir.

Since we want that tool available everywhere even where some of the subtools
aren't present, we need to ifdef the getopt handling.

man page generation is handled via ronn which is a ruby program but allows
markdown for the sources. It's hidden behind a meson option to disable where
downloading ronn isn't an option. The setup is generic enough that we can add
other man-pages by just appending to the array.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f23e77a..72bf0e9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,7 +23,7 @@ jobs:
           sudo apt update -y
           sudo env DEBIAN_FRONTEND=noninteractive apt install -y \
             doxygen libxcb-xkb-dev valgrind ninja-build \
-            libwayland-dev wayland-protocols bison graphviz
+            libwayland-dev wayland-protocols bison graphviz ruby-ronn
       - name: Setup
         run: |
           meson setup build
@@ -40,12 +40,14 @@ jobs:
     runs-on: macos-10.15
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-ruby@v1
       - uses: actions/setup-python@v1
         with:
           python-version: '3.7'
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip meson
+          gem install ronn
           brew install doxygen bison ninja
           brew link bison --force
         env:
@@ -65,6 +67,7 @@ jobs:
     runs-on: windows-2019
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-ruby@v1
       - uses: actions/setup-python@v1
         with:
           python-version: '3.7'
@@ -78,6 +81,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip meson
+          gem install ronn
           choco install ninja winflexbison3 -y --no-progress --stop-on-first-failure
       - name: Setup
         shell: cmd