getCorePlugins.sh: Various improvements

* Factor out plugin query.
  * Make idempotent.
  * Improve logging.
  * Install by symlinking to a parallel directory rather than cloning
    into `etherpad-lite/node_modules`.

src/bin/plugins/getCorePlugins.sh

@@ -1,4 +1,39 @@
-cd node_modules/
-GHUSER=ether; curl "https://api.github.com/users/$GHUSER/repos?per_page=100" | grep -o 'git@[^"]*' | grep /ep_ | xargs -L1 git clone
-GHUSER=ether; curl "https://api.github.com/users/$GHUSER/repos?per_page=100&page=2&" | grep -o 'git@[^"]*' | grep /ep_ | xargs -L1 git clone
-GHUSER=ether; curl "https://api.github.com/users/$GHUSER/repos?per_page=100&page=3&" | grep -o 'git@[^"]*' | grep /ep_ | xargs -L1 git clone
+#!/bin/sh
+
+set -e
+
+newline='
+'
+
+pecho () { printf %s\\n "$*"; }
+log () { pecho "$@"; }
+error () { log "ERROR: $@" >&2; }
+fatal () { error "$@"; exit 1; }
+
+mydir=$(cd "${0%/*}" && pwd -P) || exit 1
+cd "${mydir}/../../.."
+pdir=$(cd .. && pwd -P) || exit 1
+
+plugins=$("${mydir}/listOfficialPlugins") || exit 1
+for d in ${plugins}; do
+  log "============================================================"
+  log "${d}"
+  log "============================================================"
+  fd=${pdir}/${d}
+  repo=git@github.com:ether/${plugin}.git
+  [ -d "${fd}" ] || {
+    log "Cloning ${repo} to ${fd}..."
+    (cd "${pdir}" && git clone "${repo}" "${d}") || exit 1
+  } || exit 1
+  log "Fetching latest commits..."
+  (cd "${fd}" && git pull --ff-only) || exit 1
+  log "Getting plugin name..."
+  pn=$(cd "${fd}" && npx -c 'printf %s\\n "${npm_package_name}"') || exit 1
+  [ -n "${pn}" ] || fatal "Unable to determine plugin name for ${d}"
+  md=node_modules/${pn}
+  [ -d "${md}" ] || {
+    log "Installing plugin to ${md}..."
+    ln -s ../../"${d}" "${md}"
+  } || exit 1
+  [ "${md}" -ef "${fd}" ] || fatal "${md} is not a symlink to ${fd}"
+done

src/bin/plugins/listOfficialPlugins

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -e
+newline='
+'
+mydir=$(cd "${0%/*}" && pwd -P) || exit 1
+cd "${mydir}/../../.."
+pdir=$(cd .. && pwd -P) || exit 1
+plugins=
+for p in "" "&page=2" "&page=3"; do
+  curlOut=$(curl "https://api.github.com/users/ether/repos?per_page=100${p}") || exit 1
+  plugins=${plugins}${newline}$(printf %s\\n "${curlOut}" \
+        | sed -n -e 's;.*git@github.com:ether/\(ep_[^"]*\)\.git.*;\1;p');
+done
+printf %s\\n "${plugins}" | sort -u | grep -v '^[[:space:]]*$'