Add markdown preview, update rust.vim

sources_non_forked/markdown-preview.nvim/app/install.sh

@@ -0,0 +1,85 @@
+#!/bin/sh
+
+set -o nounset    # error when referencing undefined variable
+set -o errexit    # exit when command fails
+
+BOLD="$(tput bold 2>/dev/null || echo '')"
+GREY="$(tput setaf 0 2>/dev/null || echo '')"
+BLUE="$(tput setaf 4 2>/dev/null || echo '')"
+RED="$(tput setaf 1 2>/dev/null || echo '')"
+NO_COLOR="$(tput sgr0 2>/dev/null || echo '')"
+YELLOW="$(tput setaf 3 2>/dev/null || echo '')"
+
+error() {
+  printf "${RED} $@${NO_COLOR}\n" >&2
+}
+
+warn() {
+  printf "${YELLOW}! $@${NO_COLOR}\n"
+}
+
+info() {
+  printf "${BLUE} $@${NO_COLOR}\n"
+}
+
+fetch() {
+  local command
+  if hash curl 2>/dev/null; then
+    set +e
+    command="curl --fail -L $1"
+    curl --compressed --fail -L "$1"
+    rc=$?
+    set -e
+  else
+    if hash wget 2>/dev/null; then
+      set +e
+      command="wget -O- -q $1"
+      wget -O- -q "$1"
+      rc=$?
+      set -e
+    else
+      error "No HTTP download program (curl, wget) found…"
+      exit 1
+    fi
+  fi
+
+  if [ $rc -ne 0 ]; then
+    error "Command failed (exit code $rc): ${BLUE}${command}${NO_COLOR}"
+    exit $rc
+  fi
+}
+
+get_latest_release() {
+  fetch "https://api.github.com/repos/iamcco/markdown-preview.nvim/releases/latest" |
+    grep '"tag_name":' |
+    sed -E 's/.*"([^"]+)".*/\1/'
+}
+
+if [ $# -eq 0 ]; then
+  info "Fetching latest release."
+  tag=$(get_latest_release)
+else
+  tag=$1
+fi
+
+download() {
+  mkdir -p bin
+  cd bin
+  url="https://github.com/iamcco/markdown-preview.nvim/releases/download/$tag/${1}"
+  info "Downloading binary from ${url}"
+  if fetch "${url}" | tar xzfv -; then
+    chmod a+x ${1%.tar.gz}
+    return
+  else
+    warn "Binary not available for now, please wait for a few minutes."
+  fi
+}
+
+arch=$(uname -sm)
+case "${arch}" in
+  "Linux x86_64") download markdown-preview-linux.tar.gz ;;
+  "Linux i686") download markdown-preview-linux.tar.gz ;;
+  "Darwin x86_64") download markdown-preview-macos.tar.gz ;;
+  "Darwin arm64") download markdown-preview-macos.tar.gz ;;
+  *) info "No pre-built binary available for ${arch}.";;
+esac