gnu: Add julia-linesearches.

* gnu/packages/julia-xyz.scm (julia-linesearches): New variable.

gnu/packages/julia-xyz.scm

@@ -1,7 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2020, 2021 Nicolò Balzarotti <nicolo@nixo.xyz>
 ;;; Copyright © 2021, 2022 Simon Tournier <zimon.toutoune@gmail.com>
-;;; Copyright © 2021 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2021, 2022 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2021 Vinicius Monego <monego@posteo.net>
 ;;; Copyright © 2021 jgart <jgart@dismail.de>
 ;;;
@@ -3104,6 +3104,49 @@ equations in string literals in the Julia language.")
 implementation of matrix-free methods for iterative solvers.")
     (license license:expat)))
 
+(define-public julia-linesearches
+  (package
+    (name "julia-linesearches")
+    (version "7.1.1")
+    (source
+      (origin
+        (method git-fetch)
+        (uri (git-reference
+               (url "https://github.com/JuliaNLSolvers/LineSearches.jl")
+               (commit (string-append "v" version))))
+        (file-name (git-file-name name version))
+        (sha256
+         (base32 "1qc4la07w6s1xhcyd0hvbnpr31zc1a2ssgyybc8biv5m00g0dnr0"))))
+    (build-system julia-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'link-depot 'skip-optim-tests
+           (lambda _
+             (substitute* "test/examples.jl"
+               ;; Prevent a cycle with Optim.jl.
+               (("^    SKIPFILE.*") "")
+               (("^    #SKIPFILE") "    SKIPFILE"))))
+         (add-after 'link-depot 'skip-doublefloats-tests
+           (lambda _
+             (substitute* "test/runtests.jl"
+               (("using DoubleFloats.*") "")
+               ((".*arbitrary_precision\\.jl.*") "")))))))
+    (propagated-inputs
+     (list julia-nlsolversbase
+           julia-nanmath
+           julia-parameters))
+    (native-inputs
+     ;; DoubleFloats.jl transitively depends on TimeZones.jl, which is currently
+     ;; unpackageable due to its oversized Artifacts.toml.
+     (list ;julia-doublefloats
+           julia-optimtestproblems))
+    (home-page "https://github.com/JuliaNLSolvers/LineSearches.jl")
+    (synopsis "Line search methods for optimization and root-finding")
+    (description "This package provides an interface to line search algorithms
+implemented in Julia.")
+    (license license:expat)))
+
 (define-public julia-logexpfunctions
   (package
     (name "julia-logexpfunctions")