Plugin renamer (#393)

This plugin is an alternative to the native batch rename interface in
nnn. qmv from renameutils and vidir from moreutils allow to rename
files without fear of replacing existing files.

plugins/README.md

@@ -14,6 +14,7 @@ Plugins extend the capabilities of `nnn`. They are _executable_ scripts (or bina
 
 | Plugin (a-z) | Description | Lang | Deps |
 | --- | --- | --- | --- |
+| renamer | Batch rename files with qmv or vidir | sh | [renameutils](https://www.nongnu.org/renameutils/) or [moreutils](https://joeyh.name/code/moreutils/) |
 | boom | Play random music from dir | sh | [moc](http://moc.daper.net/) |
 | dups | List non-empty duplicate files in current dir | sh | find, md5sum,<br>sort uniq xargs |
 | chksum | Create and verify checksums | sh | md5sum,<br>sha256sum |

plugins/renamer

@@ -0,0 +1,41 @@
+#!/usr/bin/env sh
+
+# Description: Batch rename selection or current directory with qmv
+#
+# Notes:
+# - Try to mimic current batch rename functionality but with correct
+#   handling of edge cases by qmv or vidir.
+#	Qmv opens with hidden files if no selection is used. Selected
+#	directories are shown.
+#   Vidir don't show directories nor hidden files.
+#
+# Shell: POSIX compliant
+# Author: José Neder
+
+selection=${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.selection
+
+if command -v qmv >/dev/null 2>&1; then
+	batchrenamesel="qmv -fdo -da"
+	batchrename="qmv -fdo -a"
+elif command -v vidir >/dev/null 2>&1; then
+	batchrenamesel="vidir"
+	batchrename="vidir"
+else
+    printf "there is not batchrename program installed."
+    exit
+fi
+
+if [ -s "$selection" ]; then
+    printf "rename selection? "
+    read -r resp
+fi
+
+if [ "$resp" = "y" ]; then
+    # -o flag is necessary for interative editors
+    xargs -o -0 $batchrenamesel < "$selection"
+elif [ ! "$(LC_ALL=C ls -a)" = ".
+.." ]; then
+	# On older systems that don't have ls -A
+    $batchrename
+fi
+