autoformat_config_present does not re-evaluate the presence of the prettier config file after vim is started

[cjlarose]

Do you want to request a feature or report a bug?

Bug

What is the current/expected behavior?

The logic surrounding autoformat_config_present basically only runs once (when the plugin is loaded). It is desirable for that logic to be deferred until the buffer is actually written in at least two cases:

1. If you create a prettier config file in the project after you started the vim instance or
2. If you just happened to have started vim in a different directory, then :cd'ed into the directory where a prettier config file resides (or a subdirectory of such a directory)

The former bug is hopefully straightforward, but I've given more detail for the latter bug below in case it's not clear.

STR:

In .vimrc

let g:prettier#autoformat = 0 " default setting
let g:prettier#autoformat_config_present = 1 " default is 0

Example project structure:

mkdir vim-prettier-pwd-test
mkdir vim-prettier-pwd-test/plugin
echo '{}' > vim-prettier-pwd-test/plugin/.prettierrc
cat > vim-prettier-pwd-test/plugin/index.ts <<'EOF'
/**
 * @format
 */
console.log('hello');
EOF
tree -a vim-prettier-pwd-test

vim-prettier-pwd-test
└── plugin
    ├── .prettierrc
    └── index.ts

1 directory, 2 files

Open vim, :cd (or :lcd or :tcd in nvim), open the file and save

cd vim-prettier-pwd-test
nvim
:cd plugin
:e index.ts
:w

Expected

Prettier runs when you save the buffer

Observed

Prettier does not run

What version of vim-prettier are you using - (output of :PrettierVersion) ?

1.0.0-alpha

What version of prettier are you using - (output of :PrettierCliVersion) ?

2.0.4

What is your prettier executable path - (output of :PrettierCliPath) ?

/Users/chris.larose/vim-prettier-pwd-test/plugin/node_modules/.bin/prettier

Did this work in previous versions of vim-prettier and/or prettier ?

Pretty sure the same behavior has been present since the introduction of autoformat_config_present in #212