Can't load showtext

[gpsccs]

Hello, when I try to use showtext, it occour the following error:

Error: package or namespace load failed for ‘showtext’:
loadNamespace()里算'showtext'时.onLoad失败了，详细内容：
调用(call): utils::unzip(font_file, exdir = out_dir, overwrite = FALSE)
错误(error): 'exdir' does not exist

How can I fix it?

[yixuan]

Have you tried to reinstall the package?

[jinyancool]

I have same errors.

*** installing help indices
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
Error: package or namespace load failed for ‘showtext’:
.onLoad failed in loadNamespace() for 'showtext', details:
call: file.exists(path)
error: invalid 'file' argument
Error: loading failed
** checking absolute paths in shared objects and dynamic libraries
** testing if installed package can be loaded from final location
Error: package or namespace load failed for ‘showtext’:
.onLoad failed in loadNamespace() for 'showtext', details:
call: file.exists(path)
error: invalid 'file' argument
Error: loading failed
Error: .onLoad failed in loadNamespace() for 'showtext', details:
call: file.exists(path)
error: invalid 'file' argument
** testing if installed package keeps a record of temporary installation path

• DONE (showtext)

[yixuan]

These issues seem to be related to the write access of temporary directories. Make sure that the folder pointed by tempdir() is writable.

[yihui]

I think @jinyancool's issue is different from @gpsccs's issue. For @jinyancool's issue (reproduced by @XiangyunHuang: https://d.cosx.org/d/419265/3), my guess is that this is not a good idea: https://github.com/yixuan/sysfonts/blob/eae090/R/font.R#L367 The reason is that R will try to load a package from a temporary location when the package is installed. I wonder why you need lib.loc at all: https://github.com/yixuan/sysfonts/blob/eae090/R/font.R#L373 It doesn't seem to be necessary to me.

For @gpsccs's issue, you probably need to dir.create() the dir first, although it should be rare that the temp dir doesn't exist. If the creation of the dir fails, give users a more informative error message. https://github.com/yixuan/showtextdb/blob/fe105fc/R/load_showtext_fonts.R#L36

[yixuan]

Thanks for the debugging! I'll create patches later.

[yixuan]

The problem that @jinyancool encountered was likely due to these lines.

Inside the showtextdb/fonts folder there may exist some font folders such as source-han-serif-cn, but somehow the folder does not contain any fonts, and a NULL value will be passed to sysfonts::font_add(), causing the error above. I'll add more informative messages to the sysfonts and showtextdb packages.

[XiangyunHuang]

@yixuan Yeah, source-han-serif-cn/ is exist but no fonts, because I failed to install the font before.

[yixuan]

These issues should have been fixed by the latest version of the showtextdb package, which I will submit to CRAN later.

[yixuan]

The new version of showtextdb is on CRAN now.