app-shells/atuin: switch back to greadme.eclass

The package used greadme.eclass before, but was, for some unknown reason,
switched back to readme.gentoo-r1.eclass with
5cc79e4bfc ("app-shells/atuin: add 18.6.1"). However, this broke
multiple things:

- readme.gentoo-r1.eclass is not as flexible with optional README files
  as greadme.eclass, causing https://bugs.gentoo.org/956351 which was fixed with
  d1911f241f ("app-shells/atuin: fix call to readme.gentoo_create_doc
  IUSE="client"")
- the README text was copied verbatim from the bash here-doc into a
  file, resulting in wrong quotes being shown
- the readme text is only sensible if USE=client and hence was only
  conditionally shown if this the 'client' USE flag was enabled

Ultimately, greadme.eclass is more sophisticated as
readme.gentoo-r1.eclass and can be used in every situation where
readme.gentoo-r1.eclass is used.

Signed-off-by: Florian Schmaus <flow@gentoo.org>

app-shells/atuin/atuin-18.6.1-r1.ebuild

@@ -6,7 +6,7 @@ EAPI=8
 CRATES=" "
 RUST_MIN_VER="1.86"
 
-inherit cargo readme.gentoo-r1 shell-completion systemd
+inherit cargo greadme shell-completion systemd
 
 DESCRIPTION="Shell history manager supporting encrypted synchronisation"
 HOMEPAGE="https://atuin.sh https://github.com/atuinsh/atuin"
@@ -34,7 +34,7 @@ BDEPEND="test? ( dev-db/postgresql )"
 
 QA_FLAGS_IGNORED="usr/bin/${PN}"
 
-DISABLE_AUTOFORMATTING=1
+GREADME_DISABLE_AUTOFORMAT=1
 
 DOCS=( CONTRIBUTING.md CONTRIBUTORS README.md )
 
@@ -110,7 +110,6 @@ src_test() {
 }
 
 src_install() {
-	readme.gentoo_create_doc
 	dobin "${ATUIN_BIN}"
 
 	if use server; then
@@ -133,8 +132,13 @@ src_install() {
 
 	insinto "/usr/share/${PN}"
 	doins -r shell-init
-}
 
-pkg_postinst() {
-	readme.gentoo_print_elog
+	# The following readme text is only relevant if USE=client.
+	greadme_stdin <<-EOF
+	Gentoo installs atuin's shell-init code under
+	    /usr/share/atuin/shell-init/
+	Therefore, instead of using, e.g., 'eval \"\$(atuin init zsh)\"' in
+	your .zshrc you can simply put \"source /usr/share/atuin/shell-init/zsh\"
+	there, which avoids the cost of forking a process.
+EOF
 }

app-shells/atuin/atuin-18.7.1-r1.ebuild

@@ -7,7 +7,7 @@ CRATES=" "
 
 RUST_MIN_VER="1.86"
 
-inherit cargo readme.gentoo-r1 shell-completion systemd
+inherit cargo greadme shell-completion systemd
 
 DESCRIPTION="Shell history manager supporting encrypted synchronisation"
 HOMEPAGE="https://atuin.sh https://github.com/atuinsh/atuin"
@@ -35,7 +35,7 @@ BDEPEND="test? ( dev-db/postgresql )"
 
 QA_FLAGS_IGNORED="usr/bin/${PN}"
 
-DISABLE_AUTOFORMATTING=1
+GREADME_DISABLE_AUTOFORMAT=1
 
 DOCS=( CONTRIBUTING.md CONTRIBUTORS README.md )
 
@@ -111,7 +111,6 @@ src_test() {
 }
 
 src_install() {
-	readme.gentoo_create_doc
 	dobin "${ATUIN_BIN}"
 
 	if use server; then
@@ -134,8 +133,13 @@ src_install() {
 
 	insinto "/usr/share/${PN}"
 	doins -r shell-init
-}
 
-pkg_postinst() {
-	readme.gentoo_print_elog
+	# The following readme text is only relevant if USE=client.
+	greadme_stdin <<-EOF
+	Gentoo installs atuin's shell-init code under
+	    /usr/share/atuin/shell-init/
+	Therefore, instead of using, e.g., 'eval \"\$(atuin init zsh)\"' in
+	your .zshrc you can simply put \"source /usr/share/atuin/shell-init/zsh\"
+	there, which avoids the cost of forking a process.
+EOF
 }

app-shells/atuin/files/README.gentoo

@@ -1,5 +0,0 @@
-Gentoo installs atuin's shell-init code under
-	/usr/share/atuin/shell-init/
-Therefore, instead of using, e.g., 'eval \"\$(atuin init zsh)\"' in
-your .zshrc you can simply put \"source /usr/share/atuin/shell-init/zsh\"
-there, which avoids the cost of forking a process.