neomutt: update db4, add lmdb, simplify header cache implementation handling

[neverpanic (Clemens Lang)]

Here's a patch that adds a variant for LMDB, updates the DB4 version used to the latest compatible version and removes an unneeded -L/usr/lib for the header cache variant.

OK to commit?

Portfile

@@ -5 +5 @@
 PortGroup           github 1.0
 
 github.setup        neomutt neomutt 20160916 neomutt-
-revision            1
+revision            2
 categories          mail
 platforms           darwin
 license             GPL-2
@@ -52 +52 @@
                     --without-gnutls \
                     --without-gss \
                     --without-idn \
+                    --without-lmdb \
                     --without-qdbm \
                     --without-regex \
                     --without-sasl \
@@ -60 +61 @@
 
 default_variants    +idn +imap +pop +ssl
 
-if {![variant_isset db4] && ![variant_isset qdbm] && ![variant_isset tokyocabinet]} {
-    variant_set     gdbm
+set hcache_variants {db4 qdbm tokyocabinet gdbm lmdb}
+if {[variant_isset headercache]} {
+    set found no
+    foreach hcache_impl {db4 qdbm tokyocabinet gdbm lmdb} {
+        if {[variant_isset $hcache_impl]} {
+            set found yes
+        }
+    }
+    if {!$found} {
+        # If no variant was chosen, choose one for the user
+        variant_set lmdb
+    }
 }
 
 post-destroot {
@@ -73 +84 @@
 variant compress description {Compressed folders} {
     configure.args-replace      --disable-compressed --enable-compressed
 }
-variant db4 conflicts qdbm gdbm tokyocabinet description {Use Berkeley DB database} {
+variant db4 conflicts {*}[lsearch -all -inline -not $hcache_variants db4] description {Use Berkeley DB database} {
     configure.args-replace      --without-bdb --with-bdb=${prefix}
-    configure.cppflags-append   "-I${prefix}/include/db44"
-    configure.ldflags-append    "-L${prefix}/lib/db44"
-    depends_lib-append          port:db44
+    configure.cppflags-append   "-I${prefix}/include/db48"
+    configure.ldflags-append    "-L${prefix}/lib/db48"
+    depends_lib-append          port:db48
 }
 variant debug description {Debugging support} {
     configure.args-append       --enable-debug
 }
-variant gdbm conflicts db4 qdbm tokyocabinet description {Use GNU dbm database} {
+variant gdbm conflicts {*}[lsearch -all -inline -not $hcache_variants gdbm] description {Use GNU dbm database} {
     configure.args-replace      --without-gdbm --with-gdbm=${prefix}
     depends_lib-append          port:gdbm
 }
@@ -95 +106 @@
     configure.args-append       --with-gpgme-prefix=${prefix}
     depends_lib-append          port:gpgme
 }
-variant headercache conflicts db4 description {Enable header caching (requires gdbm, qdbm, or tokyocabinet)} {
+variant headercache description {Enable header caching (requires db4, gdbm, qdbm, lmdb or tokyocabinet)} {
     configure.args-replace      --disable-hcache --enable-hcache
-    configure.ldflags-append    "-L/usr/lib"
 }
 variant idn description {Internationalized Domain Name support} {
     configure.args-replace      --without-idn --with-idn=${prefix}
@@ -106 +116 @@
 variant imap description {IMAP support} {
     configure.args-replace      --disable-imap --enable-imap
 }
+variant lmdb conflicts {*}[lsearch -all -inline -not $hcache_variants lmdb] description {Use LMDB database} {
+    configure.args-replace      --without-lmdb --with-lmdb=${prefix}
+    depends_lib-append          port:lmdb
+}
 variant nntp description {NNTP support} {
     configure.args-replace      --disable-nntp --enable-nntp
 }
 variant pop description {POP support} {
     configure.args-replace      --disable-pop --enable-pop
 }
-variant qdbm conflicts db4 gdbm tokyocabinet description {Use QDBM database} {
+variant qdbm conflicts {*}[lsearch -all -inline -not $hcache_variants qdbm] description {Use QDBM database} {
     configure.args-replace      --without-qdbm --with-qdbm=${prefix}
     depends_lib-append          port:qdbm
 }
@@ -130 +144 @@
     configure.args-replace      --without-ssl --with-ssl=${prefix}
     depends_lib-append          path:lib/libssl.dylib:openssl
 }
-variant tokyocabinet conflicts db4 gdbm qdbm description {Use Tokyo Cabinet database} {
+variant tokyocabinet conflicts {*}[lsearch -all -inline -not $hcache_variants tokyocabinet] description {Use Tokyo Cabinet database} {
     configure.args-replace      --without-tokyocabinet --with-tokyocabinet=${prefix}
     depends_lib-append          port:tokyocabinet
 }