Add support for formatters locally installed via yarn 2+ pnp mode (#200)

This adds support for formatters installed locally in project
directories via yarn 2's "zero install" [pnp
mode](https://yarnpkg.com/features/pnp).

It's quite similar to the support for formatters installed locally in a
project's `node_modules` via npm, and leverages the `npx` symbol, so
existing formatter definitions should work without modification.

This checks for a `.pnp.cjs` file (expected in the project root for yarn
pnp projects), then looks for a yarn executable, and checks the version
of yarn to make sure it supports pnp. If that works, we just push
`"yarn"` onto the front of `command`.

I've only tested this with a locally installed `prettier.js`. It's very
much a works-for-me draft, I'm putting in a PR to make sure this is a
workable approach before going any further with it.

---------

Co-authored-by: Radon Rosborough <radon@intuitiveexplanations.com>

CHANGELOG.md

@@ -27,6 +27,10 @@ The format is based on [Keep a Changelog].
 * Prettier is now enabled in `svelte-mode`.
 * More tree-sitter based major modes have been added to
   `apheleia-mode-alist` ([#191]).
+* Built-in formatters now use a new `"apheleia-npx"` built-in script
+  instead of the legacy `npx` keyword. The effect of the new script is
+  the same, except that it also works with Yarn PNP projects as well
+  as `node_modules` style projects ([#200]).
 * Autoload the apheleia-goto-error command ([#215]).
 * Use `lisp-indent` as default formatter for `emacs-lisp-mode` ([#223])
 * Use `hclfmt` for formatting hashicorp HCL files ([#231])
@@ -34,6 +38,9 @@ The format is based on [Keep a Changelog].
 ### Internal Changes
 * Refactored the organisation of the apheleia package for ease of
   understanding and usability ([#215]).
+* The new `scripts/pnp-bin.js` script is standalone minified nodejs built
+  from the [`pnp-bin`](https://github.com/PuddleByteComputing/pnp-bin) repo,
+  extracted from apheleia PR [#200].
 
 ### Bugs fixed
 * `ktlint` would emit log messages into its stdout when formatting,

apheleia-formatters.el

@@ -81,42 +81,45 @@
     (perltidy . ("perltidy" "--quiet" "--standard-error-output"))
     (phpcs . ("apheleia-phpcs"))
     (prettier
-     . (npx "prettier" "--stdin-filepath" filepath
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--stdin-filepath" filepath
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-css
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=css"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--parser=css"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-html
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=html"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--parser=html"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-graphql
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=graphql"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--parser=graphql"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-javascript
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=babel-flow"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--parser=babel-flow"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-json
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=json"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--parser=json"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-markdown
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=markdown"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--parser=markdown"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-ruby
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=ruby"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--stdin-filepath" "dummy.rb"
+        "--plugin=@prettier/plugin-ruby"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-scss
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=scss"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--stdin-filepath" filepath
+        "--parser=scss"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-svelte
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=svelte"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--stdin-filepath" filepath
+        "--plugin=prettier-plugin-svelte"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-typescript
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=typescript"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+     . ("apheleia-npx" "prettier" "--parser=typescript"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
     (prettier-yaml
-     . (npx "prettier" "--stdin-filepath" filepath "--parser=yaml"
-            (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
-    (purs-tidy . (npx "purs-tidy" "format"))
+     . ("apheleia-npx" "prettier" "--parser=yaml"
+        (apheleia-formatters-js-indent "--use-tabs" "--tab-width")))
+    (purs-tidy . ("apheleia-npx" "purs-tidy" "format"))
     (rubocop . ("rubocop" "--stdin" filepath "--auto-correct"
                 "--stderr" "--format" "quiet" "--fail-level" "fatal"))
     (ruby-standard . ("standardrb" "--stdin" filepath "--fix" "--stderr"
@@ -185,6 +188,11 @@ then the first string element of the command list is resolved
 inside node_modules/.bin if such a directory exists anywhere
 above the current `default-directory'.
 
+\(However, instead of using `npx', consider using
+\"apheleia-npx\", which is a built-in script that will replicate
+the effect, but will also work with Yarn PNP projects and other
+npm project types that may exist in the future.)
+
 Any list elements that are not strings and not any of the special
 symbols mentioned above will be evaluated when the formatter is
 invoked, and spliced into the list. A form can evaluate either to
@@ -834,7 +842,7 @@ it's first in the sequence"))
           (unless remote-match
             (error "Formatter uses `file' but process will run on different \
 machine from the machine file is available on"))
-	  (setq stdin nil)
+          (setq stdin nil)
           ;; If `buffer-file-name' is nil then there is no backing
           ;; file, so `buffer-modified-p' should be ignored (it always
           ;; returns non-nil).

scripts/check-line-length.bash

@@ -7,6 +7,7 @@ find=(
     find .
     -name .git -prune -o
     -name .log -prune -o
+    -path ./scripts/pnp-bin.js -prune -o
     -path ./test/formatters -prune -o
     -name "*.elc" -o
     -type f -print

scripts/formatters/apheleia-npx

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+
+# This script is like npx but also works for yarn pnp projects, and
+# never tries to install anything. It is very fast.
+#
+# The script takes as arguments a command to execute and the arguments
+# to pass to it. If the command is installed as a binary by an npm
+# module in the current project, then that binary is used. Otherwise,
+# the script is execed as normal from $PATH. In either case, the
+# working directory is preserved.
+
+if (( "$#" == 0 )); then
+    echo >&2 "usage: apheleia-npx CMD [ARG...]"
+    exit 1
+fi
+
+# location of this script
+apheleia_dir="$(cd $(dirname ${BASH_SOURCE[0]})/../.. &>/dev/null && pwd)"
+pnp_bin="${apheleia_dir}/scripts/pnp-bin.js"
+
+# This function prints the name of the current directory if it
+# contains a file or directory named after the first argument, or the
+# parent directory if it contains such a file, or the parent's parent,
+# and so on. If no such file is found it returns nonzero.
+# https://unix.stackexchange.com/a/22215
+find_upwards() {
+    fname="$1"
+
+    path="${PWD}"
+    while [[ -n "${path}" && ! -e "${path}/${fname}" ]]; do
+        path="${path%/*}"
+    done
+    [[ -n "${path}" ]] && echo "${path}"
+}
+
+dir="$(find_upwards package.json)"
+
+if [[ -d $dir ]]; then
+    cd $dir
+
+    pnp_root=$(find_upwards '.pnp.cjs')
+    npm_root=$(find_upwards 'node_modules')
+
+    if [[ -n ${pnp_root} && ${#pnp_root} -gt ${#npm_root} ]]; then
+        # trying pnp
+        pnp_path="${pnp_root}/.pnp.cjs"
+        bin="$(${pnp_bin} ${pnp_path} $1)"
+        # note: $bin might not be on the real filesystem,
+        #   might be in a zip archive
+        if [[ -n $bin ]]; then
+            if [[ -f "${pnp_path}/.pnp.loader.mjs" ]]; then
+                loader_opt="--loader ${pnp_path}/.pnp.loader.mjs"
+            fi
+            node=$(which node)
+            command="${node} --require ${pnp_path} ${loader_opt} ${bin} ${@:2}"
+            exec ${command}
+        fi
+    elif [[ -n ${npm_root} ]]; then
+        # trying npm
+        node_modules_paths=(\
+            $(node -e 'console.log(require.resolve.paths("").join("\n"))'))
+        for path in ${node_modules_paths[@]}; do
+            if [[ -x "${path}/.bin/$1" ]]; then
+                exec "${path}/.bin/$1" "${@:2}"
+            fi
+        done
+    fi
+fi
+
+# Fall back to executing the command if it's installed and on the user's $PATH
+exec "$@"

test/formatters/apheleia-ft.el

@@ -101,11 +101,12 @@ relative to repo root, as returned by git diff --name-only."
      ((string-match
        "^scripts/formatters/\\([^/]+\\)$" changed-file)
       (let ((script (match-string 1 changed-file)))
-        (map-keys
-         (map-filter
-          (lambda (fmt def)
-            (member script def))
-          apheleia-formatters)))))))
+        (mapcar #'symbol-name
+                (map-keys
+                 (map-filter
+                  (lambda (fmt def)
+                    (and (listp def) (member script def)))
+                  apheleia-formatters))))))))
 
 (defun apheleia-ft--get-formatters-for-pull-request ()
   "Return list of formatter string names that were touched in this PR.
@@ -133,7 +134,10 @@ main."
   "Print to stdout a comma-delimited list of formatters changed in this PR."
   (princ (concat
           (string-join
-           (apheleia-ft--get-formatters-for-pull-request) ",")
+           (cl-remove-duplicates
+            (apheleia-ft--get-formatters-for-pull-request)
+            :test 'string=)
+           ",")
           "\n")))
 
 (defun apheleia-ft--read-file (filename)

test/formatters/install-common.bash

@@ -6,14 +6,10 @@ export DEBIAN_FRONTEND=noninteractive
 apt-get update
 apt-get install -y ca-certificates curl gnupg lsb-release software-properties-common
 
-curl -fsSL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
-
-ubuntu_name="$(lsb_release -cs)"
-node_repo="$(curl -fsSL https://deb.nodesource.com/setup_current.x | grep NODEREPO= | grep -Eo 'node_[0-9]+\.x' | head -n1)"
-
-tee -a /etc/apt/sources.list.d/nodejs.list >/dev/null <<EOF
-deb [arch=amd64] https://deb.nodesource.com/${node_repo} ${ubuntu_name} main
-EOF
+mkdir -p /etc/apt/keyrings
+curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
+NODE_MAJOR=20
+echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | tee /etc/apt/sources.list.d/nodesource.list
 
 add-apt-repository -n ppa:longsleep/golang-backports
 
@@ -30,9 +26,6 @@ nodejs
 sudo
 unzip
 wget
-sudo
-unzip
-wget
 
 "
 

test/formatters/installers/prettier-ruby.bash

@@ -1,15 +1,16 @@
 # Need ruby for gem, need gcc and ruby headers for native gem deps
 apt-get install -y ruby ruby-dev gcc
 
-# Install the plugin
-npm install -g prettier @prettier/plugin-ruby
-
-# Have to install from source because release not tagged yet
-# https://github.com/ruby-syntax-tree/syntax_tree-rbs/pull/34
-# https://stackoverflow.com/a/11767563
-gem install specific_install
-gem specific_install -l https://github.com/ruby-syntax-tree/syntax_tree-rbs.git
+# Apparently rubygems does not know how to do dependency resolution.
+# So we have to manually install an old version of this dependency to
+# avoid the latest version getting installed and then failing to build
+# because it does not support ruby 2.7 which is what we have.
+gem install rbs -v 3.1.3
 
 # These are required dependencies documented at
 # https://www.npmjs.com/package/@prettier/plugin-ruby
 gem install prettier_print syntax_tree syntax_tree-haml syntax_tree-rbs
+
+# Install the plugin
+cd /tmp
+npm install --save-dev prettier @prettier/plugin-ruby

test/formatters/installers/prettier-svelte.bash

@@ -1 +1,2 @@
-npm install -g prettier-plugin-svelte prettier
+cd /tmp
+npm install --save-dev prettier-plugin-svelte prettier