substitute version and date in man pages

this shortens the release checklist and reduces commit churn.

for the date we use configure's timestamp. this should reflect the
package's creation time and be consistent with the version.

configure.ac

@@ -251,7 +251,10 @@ if test "x$have_macos_keychain" != xno; then
     AC_SUBST(KEYCHAIN_LIBS, ["-Wl,-framework,Security,-framework,CoreFoundation"])
 fi
 
-AC_CONFIG_FILES([Makefile src/Makefile isync.spec])
+RELEASE_DATE=`date -r $0 +%F`
+AC_SUBST(RELEASE_DATE)
+
+AC_CONFIG_FILES([Makefile src/Makefile src/mbsync.1 src/mdconvert.1 isync.spec])
 AC_OUTPUT
 
 AC_MSG_RESULT()

src/.gitignore

@@ -1,6 +1,8 @@
 /drv_proxy.inc
 /mbsync
+/mbsync.1
 /mdconvert
+/mdconvert.1
 /tst_imap_msgs
 /tst_imap_utf7
 /tst_msg_cvt

src/Makefile.am

@@ -27,7 +27,10 @@ mdconvert_prog = mdconvert
 mdconvert_man = mdconvert.1
 endif
 
+in_man = mbsync.1.in mdconvert.1.in
+
 bin_PROGRAMS = mbsync $(mdconvert_prog)
+# don't forget to update AC_CONFIG_FILES in configure.ac!
 man_MANS = mbsync.1 $(mdconvert_man)
 
 tst_imap_msgs_SOURCES = tst_imap_msgs.c imap_msgs.c util.c
@@ -47,6 +50,6 @@ EXTRA_PROGRAMS = tst_timers
 exampledir = $(docdir)/examples
 example_DATA = mbsyncrc.sample
 
-EXTRA_DIST = drv_proxy_gen.pl run-tests.pl $(example_DATA) $(man_MANS)
+EXTRA_DIST = drv_proxy_gen.pl run-tests.pl $(example_DATA) $(in_man)
 
 CLEANFILES = drv_proxy.inc

src/mbsync.1.in

@@ -4,7 +4,7 @@
 .\"
 .\" mbsync - mailbox synchronizer
 .
-.TH mbsync 1 "2022 Jun 16"
+.TH mbsync 1 @RELEASE_DATE@ "@PACKAGE_STRING@" "User Commands"
 .
 .SH NAME
 mbsync - synchronize IMAP4 and Maildir mailboxes

src/mdconvert.1.in

@@ -3,7 +3,7 @@
 .\"
 .\" mdconvert - Maildir mailbox UID storage scheme converter
 .
-.TH mdconvert 1 "2004 Mar 27"
+.TH mdconvert 1 @RELEASE_DATE@ "@PACKAGE_STRING@" "User Commands"
 .
 .SH NAME
 mdconvert - Maildir mailbox UID storage scheme converter