make collection xref for git help

README.md

@@ -49,8 +49,9 @@ documentation cross-reference index:
 ```
 
 `raco setup git` builds and indexes the package documentation. The help command
-uses the indexed path and anchor instead of assuming a particular documentation
-directory.
+builds a fresh cross-reference view for each request, so documentation generated
+during the current DrRacket session is visible immediately. It uses the indexed
+path and anchor instead of assuming a particular documentation directory.
 
 ## HTTPS credentials
 

info.rkt

@@ -2,7 +2,7 @@
 
 (define collection "git")
 (define pkg-desc "Command-line-like Git operations for Racket, implemented with libgit2")
-(define version "0.2.15")
+(define version "0.2.16")
 (define pkg-authors '("Hans Dijkema"))
 (define license 'MIT)
 

main.rkt

@@ -123,9 +123,10 @@
                   (lambda ()
                     (error 'git-help "unknown help topic: ~a" topic)))
         'git))
-  ;; Use Racket's installed-documentation cross-reference database instead of
-  ;; guessing where raco setup placed this package's generated HTML.
-  (define xref (load-collections-xref))
+  ;; Build a fresh installed-documentation cross-reference database instead of
+  ;; using load-collections-xref's process-local cache. This makes help notice
+  ;; documentation generated by raco setup during the current DrRacket session.
+  (define xref (make-collections-xref))
   (define tag
     (xref-binding->definition-tag xref (list 'git binding) #f))
   (unless tag

scribblings/git.scrbl

@@ -48,14 +48,14 @@ Calls @racket[git], displays its result in a compact human-readable form, and re
 (git 'help 'restore)
 ]
 
-Help uses Racket's installed-documentation cross-reference database. It resolves the documented binding for the requested command through @racketmodname[setup/xref] and @racketmodname[scribble/xref], then opens the path and anchor recorded by @exec{raco setup}. No documentation directory is guessed or constructed by @racketmodname[git]. If the binding is not indexed, @racket[git-help] reports that @exec{raco setup git} should be run.
+Help uses Racket's installed-documentation cross-reference database. It builds a fresh collection xref for each help request, resolves the documented binding through @racketmodname[setup/xref] and @racketmodname[scribble/xref], then opens the path and anchor recorded by @exec{raco setup}. This means a newly run @exec{raco setup git} is visible immediately in the same DrRacket session. No documentation directory is guessed or constructed by @racketmodname[git]. If the binding is not indexed, @racket[git-help] reports that @exec{raco setup git} should be run.
 
 @section[#:tag "version"]{Version}
 
 @defproc[(git-version) string?]{Returns the package version from @tt{info.rkt}. The command form is @racket[(git 'version)]. The version is not duplicated in @tt{main.rkt}; @tt{info.rkt} is the single source of truth.}
 
 @racketblock[
-(git 'version) ; => "0.2.15"
+(git 'version) ; => "0.2.16"
 ]
 
 @section[#:tag "repository"]{Repository}