Make "git tag" sort our SemVer-ish tags correctly

This sorts numerically for each of major, minor, and patch, rather than, e.g., rating 2.1.15 as a higher version than 2.1.2. It also rates things like X-beta and X-rc as lower versions than X, but X-patched (not SemVer, but present in this project) as higher versions than X.

Author: EliahKagan

Makefile

@@ -8,10 +8,14 @@ clean:
 
 release: clean
 # Check if latest tag is the current head we're releasing
-echo"Latest tag = $$(git tag -l '[0-9]*' --sort=-v:refname | head -n1)"
-echo"HEAD SHA = $$(git rev-parse HEAD)"
-echo"Latest tag SHA = $$(git tag -l '[0-9]*' --sort=-v:refname | head -n1 | xargs git rev-parse)"
- @test "$$(git rev-parse HEAD)" = "$$(git tag -l '[0-9]*' --sort=-v:refname | head -n1 | xargs git rev-parse)"
+ @config_opts="$$(printf ' -c versionsort.suffix=-%s' alpha beta pre rc RC)"&&\
+ latest_tag=$$(git $$config_opts tag -l '[0-9]*' --sort=-v:refname | head -n1)&&\
+ head_sha=$$(git rev-parse HEAD) latest_tag_sha=$$(git rev-parse "$$latest_tag")&&\
+printf'%-14s = %s\n''Latest tag'"$$latest_tag"\
+'HEAD SHA'"$$head_sha"\
+'Latest tag SHA'"$$latest_tag_sha"&&\
+test"$$head_sha" = "$$latest_tag_sha"
+
  make force_release
 
 force_release: clean