close #772: use --renderToMemory by default for hugo server

Author: yihui

DESCRIPTION

@@ -1,7 +1,7 @@
 Type: Package
 Package: blogdown
 Title: Create Blogs and Websites with R Markdown
-Version: 1.20.1
+Version: 1.20.2
 Authors@R: c(
     person("Yihui", "Xie", role = c("aut", "cre"), email = "xie@yihui.name", comment = c(ORCID = "0000-0003-0645-5666")),
     person("Christophe", "Dervieux", role = "aut", email = "cderv@posit.co", comment = c(ORCID = "0000-0003-4474-2498")),

NEWS.md

@@ -1,5 +1,7 @@
 # CHANGES IN blogdown VERSION 1.21
 
+- Use the `--renderToMemory` flag by default for Hugo >= 0.123.0 when starting `hugo server` (thanks, @drmowinckels, #772). If you do not wish to use this flag by default, please see https://bookdown.org/yihui/blogdown/livereload.html on how to configure your own default flags for `hugo server`.
+
 # CHANGES IN blogdown VERSION 1.20
 
 - Redirect the wowchemy themes to HugoBlox.

R/hugo.R

@@ -709,6 +709,7 @@ hugo_server_args = function(host, port) {
   c(
     'server', '--bind', host, '-p', port, theme_flag(), get_option('blogdown.hugo.server', c(
       '-D', '-F', if (hugo_available('0.25')) '--navigateToChanged',
+      if (hugo_available('0.123.0')) '--renderToMemory',
       if (is_rstudio_server()) c('--liveReloadPort', '443')
     ))
   )