Merge 27dea683a557793259c3119a63d50eaa5c621453 into 5dc31ac51b08f910a2de1596b37a6a3dddd5e7b7

See #1187.

nvm.sh

@@ -691,6 +691,11 @@ nvm_ensure_version_installed() {
   LOCAL_VERSION="$(nvm_version "${PROVIDED_VERSION}")"
   EXIT_CODE="$?"
   local NVM_VERSION_DIR
+
+  if [ "_$PROVIDED_VERSION" = "_N/A" ] && [ ! -d "$NVM_RC_VERSION" ] ; then
+    PROVIDED_VERSION="$(nvm_ensure_version_prefix "$NVM_RC_VERSION")"
+  fi
+
   if [ "${EXIT_CODE}" != "0" ] || ! nvm_is_version_installed "${LOCAL_VERSION}"; then
     if VERSION="$(nvm_resolve_alias "${PROVIDED_VERSION}")"; then
       nvm_err "N/A: version \"${PROVIDED_VERSION} -> ${VERSION}\" is not yet installed."
@@ -700,7 +705,9 @@ nvm_ensure_version_installed() {
       nvm_err "N/A: version \"${PREFIXED_VERSION:-$PROVIDED_VERSION}\" is not yet installed."
     fi
     nvm_err ""
-    if [ "${IS_VERSION_FROM_NVMRC}" != '1' ]; then
+    if [ "${PROVIDED_VERSION}" = 'lts' ]; then
+      nvm_err '`lts` is not an alias - you may need to run `nvm install --lts` to install and `nvm use --lts` to use it.'
+    elif [ "${IS_VERSION_FROM_NVMRC}" != '1' ]; then
       nvm_err "You need to run \`nvm install ${PROVIDED_VERSION}\` to install and use it."
     else
       nvm_err 'You need to run `nvm install` to install and use the node version specified in `.nvmrc`.'

test/slow/nvm use/Running 'nvm use lts' shows actionable error

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -ex
+
+die () { echo "$@" ; exit 1; }
+
+\. ../../../nvm.sh
+
+# Deactivate any active node version
+nvm deactivate >/dev/null 2>&1 || die 'deactivate failed'
+
+# Attempt to use 'lts' without '--' and capture the error message
+ERROR_OUTPUT=$(nvm use lts 2>&1) || true
+
+EXPECTED_ERROR='`lts` is not an alias - you may need to run `nvm install --lts` to install and `nvm use --lts` to use it.'
+
+# Check if the error message matches the expected output
+echo "$ERROR_OUTPUT" | grep -q "$EXPECTED_ERROR" \
+  || die "Expected error message not found. Got: $ERROR_OUTPUT"

test/slow/nvm use/Running 'nvm use' displays .nvmrc version in output messages

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -ex
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+echo "v0.10.28" > .nvmrc
+OUTPUT="$(nvm use 2>&1 >/dev/null | awk 'NR==1')"
+EXPECTED_OUTPUT='N/A: version "v0.10.28" is not yet installed.'
+TESTTT="$(nvm use 2>&1 >/dev/null)"
+TESTT="$(nvm use 2>&1)"
+TEST="$(nvm use)"
+
+[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] \
+  || die "'nvm use' did not output: '$EXPECTED_OUTPUT'; got: '$OUTPUT'; Normal: $TEST; with 2>&1: $TESTT; with /null: $TESTTT"
+
+OUTPUT="$(nvm use 2>&1 >/dev/null | awk 'NR==3')"
+EXPECTED_OUTPUT='You need to run "nvm install v0.10.28" to install it before using it.'
+
+[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] \
+  || die "'nvm use' did not output: '$EXPECTED_OUTPUT'; got: '$OUTPUT'"

test/slow/nvm use/setup_dir

@@ -19,5 +19,9 @@ for VERSION in "1.0.0" "1.0.1"; do
   nvm install "iojs-v$VERSION"
 done
 
+if [ -f ".nvmrc" ]; then
+  mv .nvmrc .nvmrc.bak
+fi
+
 nvm_make_alias lts/testing 0.10.1
 nvm_make_alias 'lts/*' lts/testing

test/slow/nvm use/teardown_dir

@@ -20,3 +20,9 @@ if [ -d "${NVM_DIR}/.nvm_use_lts_alias_bak" ]; then
   mv "${NVM_DIR}/.nvm_use_lts_alias_bak/*" "${NVM_DIR}/alias/lts/"
   rmdir "${NVM_DIR}/.nvm_use_lts_alias_bak"
 fi
+
+rm .nvmrc
+
+if [ -f ".nvmrc.bak" ]; then
+  mv .nvmrc.bak .nvmrc
+fi