[Refactor] prefer awk over pipes in more places

nvm.sh

@@ -134,15 +134,17 @@ nvm_download() {
     eval "curl -q --fail ${CURL_COMPRESSED_FLAG:-} ${CURL_HEADER_FLAG:-} ${NVM_DOWNLOAD_ARGS}"
   elif nvm_has "wget"; then
     # Emulate curl with wget
-    ARGS=$(nvm_echo "$@" | command sed -e 's/--progress-bar /--progress=bar /' \
-                            -e 's/--compressed //' \
-                            -e 's/--fail //' \
-                            -e 's/-L //' \
-                            -e 's/-I /--server-response /' \
-                            -e 's/-s /-q /' \
-                            -e 's/-sS /-nv /' \
-                            -e 's/-o /-O /' \
-                            -e 's/-C - /-c /')
+    ARGS=$(nvm_echo "$@" | command sed "
+      s/--progress-bar /--progress=bar /
+      s/--compressed //
+      s/--fail //
+      s/-L //
+      s/-I /--server-response /
+      s/-s /-q /
+      s/-sS /-nv /
+      s/-o /-O /
+      s/-C - /-c /
+    ")
 
     if [ -n "${NVM_AUTH_HEADER:-}" ]; then
       ARGS="${ARGS} --header \"${NVM_AUTH_HEADER}\""
@@ -1533,32 +1535,19 @@ nvm_ls() {
     fi
     if [ -n "${NVM_DIRS_TO_SEARCH1}${NVM_DIRS_TO_SEARCH2}${NVM_DIRS_TO_SEARCH3}" ]; then
       VERSIONS="$(command find "${NVM_DIRS_TO_SEARCH1}"/* "${NVM_DIRS_TO_SEARCH2}"/* "${NVM_DIRS_TO_SEARCH3}"/* -name . -o -type d -prune -o -path "${PATTERN}*" \
-        | command awk \
-            -v dir_iojs="${NVM_VERSION_DIR_IOJS}" \
-            -v iojs_prefix="versions/${NVM_IOJS_PREFIX}/" \
-            -v dir="${NVM_DIR}" \
-            -v search="${SEARCH_PATTERN}" \
-            -v node_prefix="${NVM_NODE_PREFIX}" '
-            {
-              sub(dir_iojs"/", iojs_prefix)
-              sub("^" dir "/", "")
-              if ($0 ~ /^[^v]/) next
-              if ($0 == "versions") next
-              sub(/^versions\//, "")
-              sub(/^v/, node_prefix"/v")
-              if ($0 !~ search) next
-              sub(/^([^/]+)\/(.*)$/, "\\2.\\1")
-              print
-            }
-          ' \
+        | command sed -e "
+            s#${NVM_VERSION_DIR_IOJS}/#versions/${NVM_IOJS_PREFIX}/#;
+            s#^${NVM_DIR}/##;
+            \\#^[^v]# d;
+            \\#^versions\$# d;
+            s#^versions/##;
+            s#^v#${NVM_NODE_PREFIX}/v#;
+            \\#${SEARCH_PATTERN}# !d;
+          " \
+          -e 's#^\([^/]\{1,\}\)/\(.*\)$#\2.\1#;' \
         | command sort -t. -u -k 1.2,1n -k 2,2n -k 3,3n \
-          | command awk -v node_prefix="${NVM_NODE_PREFIX}" '
-              {
-                sub(/^(.*)\.([^.]*)$/, "\\2-\\1")
-                sub("^" node_prefix"-", "")
-                print
-              }
-            '
+        | command sed -e 's#\(.*\)\.\([^\.]\{1,\}\)$#\2-\1#;' \
+                      -e "s#^${NVM_NODE_PREFIX}-##;" \
       )"
     fi
   fi
@@ -2051,7 +2040,7 @@ nvm_print_implicit_alias() {
 
       nvm_is_zsh && setopt local_options shwordsplit
 
-      LAST_TWO=$($NVM_COMMAND | nvm_grep -e '^v' | command cut -c2- | command cut -d . -f 1,2 | uniq)
+      LAST_TWO="$($NVM_COMMAND | command awk '/^v/ { sub(/^v/, ""); split($0, parts, "\\."); short=parts[1]"."parts[2]; if (!seen[short]++) print short }')"
     ;;
   esac
   local MINOR
@@ -2768,13 +2757,19 @@ nvm_npm_global_modules() {
   local NPMLIST
   local VERSION
   VERSION="$1"
-  NPMLIST=$(nvm use "${VERSION}" >/dev/null && npm list -g --depth=0 2>/dev/null | command sed 1,1d | nvm_grep -v 'UNMET PEER DEPENDENCY')
+  NPMLIST="$(nvm use "${VERSION}" >/dev/null && npm list -g --depth=0 2>/dev/null | command awk 'NR == 1 { next } /UNMET PEER DEPENDENCY/ { next } { print }')"
 
   local INSTALLS
-  INSTALLS=$(nvm_echo "${NPMLIST}" | command sed -e '/ -> / d' -e '/\(empty\)/ d' -e 's/^.* \(.*@[^ ]*\).*/\1/' -e '/^npm@[^ ]*.*$/ d' | command xargs)
+  INSTALLS="$(nvm_echo "${NPMLIST}" | command awk '
+      / -> /         { next }
+      /\(empty\)/    { next }
+      /^npm@/        { next }
+      { sub(/^.* (.*@[^ ]*).*/,"\\1"); if (length($0) > 0) print }
+    ' | command xargs
+  )"
 
   local LINKS
-  LINKS="$(nvm_echo "${NPMLIST}" | command sed -n 's/.* -> \(.*\)/\1/ p')"
+  LINKS="$(nvm_echo "${NPMLIST}" | command awk '/ -> / { sub(/.* -> /,""); print } ')"
 
   nvm_echo "${INSTALLS} //// ${LINKS}"
 }