games-misc/cowsay: misc fixes

* 3.0.7 -> 3.7.0 for patch versions (seems like a typo)
* use prefix= instead of sed for prefix, not much better
  but it's the normal way
* ... add sed for man page's %PREFIX% that the Makefile doesn't handle
* fix mech-and-cow lack of extension, patch attempted to do a
  rename but a normal non-git patch can't do this

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

games-misc/cowsay/cowsay-3.7.0.ebuild

@@ -5,7 +5,7 @@ EAPI=8
 
 DESCRIPTION="Configurable talking ASCII cow (and other characters)"
 HOMEPAGE="https://cowsay.diamonds https://github.com/cowsay-org/cowsay"
-SRC_URI="https://github.com/cowsay-org/${PN}/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
+SRC_URI="https://github.com/cowsay-org/cowsay/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="GPL-3"
 SLOT="0"
@@ -15,12 +15,21 @@ RDEPEND="dev-lang/perl"
 BDEPEND="${RDEPEND}"
 
 PATCHES=(
-	"${FILESDIR}/${PN}-3.0.7-head-in.patch"
-	"${FILESDIR}/${PN}-3.0.7-mech-and-cow.patch"
+	"${FILESDIR}/${P}-head-in.patch"
+	"${FILESDIR}/${P}-mech-and-cow.patch"
 )
 
 src_prepare() {
 	default
 
-	sed -i 's#/usr/local#/${EPREFIX}/usr#' Makefile || die
+	# no |g leaves one %PREFIX% but it makes sense in context
+	sed -i "s|%PREFIX%|${EPREFIX}/usr|" cowsay.1 || die
+
+	# patch fixes the file but need extension to be recognized
+	mv share/cows/mech-and-cow{,.cow} || die
+}
+
+src_install() {
+	emake DESTDIR="${D}" prefix="${EPREFIX}/usr" install
+	einstalldocs
 }

games-misc/cowsay/files/cowsay-3.7.0-mech-and-cow.patch

@@ -1,5 +1,5 @@
 --- a/share/cows/mech-and-cow
-+++ b/share/cows/mech-and-cow.cow
++++ b/share/cows/mech-and-cow
 @@ -1,3 +1,5 @@
 +$the_cow = <<EOC;
 +${thouts}