build: use install-info when installing mu4e/guile

So the docs can be found.

build-aux/meson-install-info.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+infodir=$1
+infofile=$2
+
+# Meson post-install script to update info metadata
+install-info --info-dir ${MESON_INSTALL_DESTDIR_PREFIX}/${infodir} \
+	     ${MESON_INSTALL_DESTDIR_PREFIX}/${infodir}/${infofile}
+
+gzip --force ${MESON_INSTALL_DESTDIR_PREFIX}/${infodir}/${infofile}

guile/meson.build

@@ -85,6 +85,12 @@ if makeinfo.found()
 			  '-o', join_paths(meson.current_build_dir(), 'mu-guile.info'),
 			  join_paths(meson.current_source_dir(), 'mu-guile.texi'),
 			  '-I', join_paths(meson.current_build_dir(), '..')])
+
+  if install_info.found()
+    meson.add_install_script(install_info_script, 'share/info', 'mu-guile.info')
+  endif
+
+  
 endif
 
 guile_scm_dir=join_paths(datadir, 'guile', 'site', '3.0', 'mu')

meson.build

@@ -117,11 +117,11 @@ gmime_dep      = dependency('gmime-3.0', version: '>= 3.2')
 xapian_dep     = dependency('xapian-core', version:'>= 1.4')
 thread_dep     = dependency('threads')
 
+awk=find_program(['gawk', 'awk'])
+gzip=find_program('gzip')
+
 # soft dependencies
 guile_dep = dependency('guile-3.0', required: get_option('guile'))
-
-awk=find_program(['gawk', 'awk'])
-
 # soft dependencies
 
 # emacs -- needed for mu4e compilation
@@ -134,6 +134,14 @@ endif
 makeinfo=find_program(['makeinfo'], required:false)
 if not makeinfo.found()
   message('makeinfo (texinfo) not found; not building info documentation')
+else
+  install_info=find_program(['install-info'], required:false)
+  if not install_info.found()
+    message('install-info not found')
+  else
+    install_info_script=join_paths(meson.current_source_dir(), 'build-aux',
+                                   'meson-install-info.sh')
+  endif
 endif
 
 # readline. annoyingly, macos has an incompatible libedit claiming to be

mu4e/meson.build

@@ -109,8 +109,7 @@ if makeinfo.found()
   version_texi = configure_file(
     input:  'version.texi.in',
     output: 'version.texi',
-    configuration: version_texi_data
-  )
+    configuration: version_texi_data)
 
   custom_target('mu4e_info',
                 input: 'mu4e.texi',
@@ -121,4 +120,7 @@ if makeinfo.found()
                           '-o', join_paths(meson.current_build_dir(), 'mu4e.info'),
                           join_paths(meson.current_source_dir(), 'mu4e.texi'),
                           '-I', join_paths(meson.current_build_dir(), '..')])
+  if install_info.found()
+    meson.add_install_script(install_info_script, 'share/info', 'mu4e.info')
+  endif
 endif