Improve meson man page generation. It still sucks.

customman = join_paths(meson.current_source_dir(), 'custom-man.xsl')

customhtml = join_paths(meson.current_source_dir(), 'custom-html.xsl')

xsltproc_flags = [

man1dir = join_paths(get_option('mandir'), 'man1')

commonargs = [

  xsltproc,

  '--nonet',

  '--xinclude',

  '--stringparam', 'man.output.quietly', '1',

  '--stringparam', 'man.authors.section.enabled', '0',

  '--stringparam',  'man.copyright.section.enabled', '0',

  '--stringparam', 'mlm.version', meson.project_version(),

  '--path', meson.current_source_dir()

]

input_files = [

  'mlm-tags.xml'

]

output_man_files = [

  'mlm-tags.1'

]

output_html_files = [

  'mlm-tags.html'

  '--path', meson.current_source_dir(),

  '-o', '@OUTPUT@'

]

man_pages = custom_target('man-pages',

                          output: output_man_files,

                          input: input_files,

                          command: [ xsltproc,

                                     xsltproc_flags,

                                     '-o', '@OUTPUT@',

                                     customman, '@INPUT@'],

                          install: true,

                          install_dir: join_paths(get_option('mandir'), 'man1')

                         )

genman1 = [ commonargs, customman, '@INPUT@' ]

html_pages = custom_target('html-pages',

                           output: output_html_files,

                           input: input_files,

                           command: [ xsltproc,

                                      xsltproc_flags,

                                      '-o', '@OUTPUT@',

                                      customhtml, '@INPUT@'],

                           install: false,

                           install_dir: join_paths(get_option('mandir'), 'man1')

                          )

name = 'analyze'

custom_target('mlm-' + name + '.1',

              output: 'mlm-' + name + '.1',

              input: 'mlm-' + name + '.xml',

              command: genman1, install: true, install_dir: man1dir)

name = 'copy-tags'

custom_target('mlm-' + name + '.1',

              output: 'mlm-' + name + '.1',

              input: 'mlm-' + name + '.xml',

              command: genman1, install: true, install_dir: man1dir)

name = 'tags'

custom_target('mlm-' + name + '.1',

              output: 'mlm-' + name + '.1',

              input: 'mlm-' + name + '.xml',

              command: genman1, install: true, install_dir: man1dir)