[bug#53257] [PATCH] gnu: foot: Wrap the program to expose TERMINFO_DIRS

[Kevin Boulain <kevinboulain@gmail.com>]

As discussed in https://issues.guix.gnu.org/53257, it appears the
preferred way to expose TERMINFO_DIRS to programs running under a
terminal is to wrap the terminal with a script that sets TERMINFO_DIRS
before exec'ing it.
This is less invasive than unconditionally setting TERMINFO_DIRS in the
profile (via native-search-paths) as this particular environment
variable is only necessary when running the terminal itself.

* gnu/packages/terminals.scm (foot): Export TERMINFO_DIRS.
---
 gnu/packages/terminals.scm | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/terminals.scm b/gnu/packages/terminals.scm
index 06fa341472..558b91fa24 100644
--- a/gnu/packages/terminals.scm
+++ b/gnu/packages/terminals.scm
@@ -48,6 +48,7 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu packages terminals)
+  #:use-module (guix gexp)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix build-system cargo)
   #:use-module (guix build-system cmake)
@@ -63,6 +64,7 @@ (define-module (gnu packages terminals)
   #:use-module (gnu packages)
   #:use-module (gnu packages autotools)
   #:use-module (gnu packages base)
+  #:use-module (gnu packages bash)
   #:use-module (gnu packages check)
   #:use-module (gnu packages cmake)
   #:use-module (gnu packages compression)
@@ -852,12 +854,24 @@ (define-public foot
        ;; also to address a GCC 10 issue when doing PGO builds.
        #:build-type "release"
        ;; Enable LTO as recommended by INSTALL.md.
-       #:configure-flags '("-Db_lto=true")))
+       #:configure-flags '("-Db_lto=true")
+       ;; Ensure the terminfo database is available to programs spawned under
+       ;; the terminal.
+       #:phases
+       ,#~(modify-phases %standard-phases
+            (add-after 'install 'wrap-program
+              (lambda _
+                (let ((out #$output))
+                  ;; footclient executes programs under the server process,
+                  ;; there is no need to wrap it too.
+                  (wrap-program (string-append out "/bin/foot")
+                    `("TERMINFO_DIRS" ":" prefix
+                      (,(string-append out "/share/terminfo"))))))))))
     (native-inputs
      (list ncurses ;for 'tic'
            pkg-config scdoc wayland-protocols))
     (inputs
-     (list fcft libxkbcommon wayland))
+     (list bash-minimal fcft libxkbcommon wayland))
     (synopsis "Wayland-native terminal emulator")
     (description
      "@command{foot} is a terminal emulator for systems using the Wayland
-- 
2.34.0