add basic nsxiv scripts

.config/nsxiv/exec/image-info

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+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/image-info
+# Called by nsxiv(1) whenever an image gets loaded.
+# The output is displayed in nsxiv's status bar.
+# Arguments:
+#   $1: path to image file (as provided by the user)
+#   $2: image width
+#   $3: image height
+#   $4: fully resolved path to the image file
+
+s="  " # field separator
+
+exec 2>/dev/null
+
+filename=$(basename -- "$1")
+filesize=$(du -Hh -- "$1" | cut -f 1)
+geometry="${2}x${3}"
+
+echo "${filesize}${s}${geometry}${s}${filename}"
+

.config/nsxiv/exec/thumb-info

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+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/thumb-info
+# Called by nsxiv(1) whenever the selected thumbnail changes.
+# The output is displayed in nsxiv's status bar.
+# Arguments:
+#   $1: path to image file (as provided by the user)
+#   $2: empty
+#   $3: empty
+#   $4: fully resolved path to the image file
+
+s="  " # field separator
+
+exec 2>/dev/null
+
+filename=$(basename -- "$4")
+filesize=$(du -Hh -- "$4" | cut -f 1)
+
+echo "${filesize}${s}${filename}"
+

.config/nsxiv/exec/win-title

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+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/win-title
+# Called by nsxiv(1) whenever any of the relevant information changes.
+# The output is set as nsxiv's window title.
+#
+# Arguments, "Optional" arguments might be empty:
+#   $1: resolved absolute path of the current file
+#   $2: current file number
+#   $3: total file number
+#   $4: image width (Optional: Disabled on thumbnails mode)
+#   $5: image height (Optional: Disabled on thumbnails mode)
+#   $6: current zoom (Optional: Disabled on thumbnails mode)
+#
+# The term file is used rather than image as nsxiv does not
+# precheck that the input files are valid images. Total file
+# count may be different from the actual count of valid images.
+
+exec 2>/dev/null
+
+filename="${1##*/}"
+
+if [ -n "$4" ]; then # image mode
+	printf "%s" "nsxiv - ${filename} | ${4}x${5} ${6}% [${2}/${3}]"
+else
+	printf "%s" "nsxiv - ${filename} [${2}/${3}]"
+fi