3 files changed, 59 insertions, 44 deletions
diff --git a/mapGen/README.md b/mapGen/README.md
index c64a940..3af03f0 100644
--- a/mapGen/README.md
+++ b/mapGen/README.md
@@ -1,6 +1,6 @@
 # mapGen.sh
 
-A shellscript to make grid maps from text files.
+A shellscript to make grid maps from text input.
 
 ![Simple map example](examples/simpleBig.jpg)
 
@@ -20,17 +20,17 @@ xxxxx
 
 ## Motivation
 
-The want for Vim to be a map maker.
+Using Vim as a map maker.
 
 ## Concept
 
-Given a text file in which each character represents a cell, have a script draw that map.
+Given a text input in which each character represents a cell, have a script draw that map.
 
-`mapGen.sh` takes as input a text file which ideally has a block of characters of any size but of
-rectangular shape with no missing ones. It also takes a folder in which tile images are supposed to
-be. For each character in the file it randomly takes one image in that folder which name starts
-with that character and composes it into the map image with the help of the `convert` command from
-ImageMagick.
+`mapGen.sh` takes as input a text file or standard input which ideally has a block of characters of
+any size but of rectangular shape with no missing ones. It also takes a folder in which tile images
+are supposed to be. For each character in the input it randomly takes one image in that folder which
+name starts with that character and composes it into the map image with the help of the `convert`
+command from ImageMagick.
 
 ## Examples
 
@@ -70,13 +70,21 @@ XXXXXXXXXooXXXXXXXXX
 ```
 
 Note that for the second image a different folder with some missing tiles where used (no tiles
-starting by D or S). The script puts a red pixel there and the cyan background is seen, indicating
-this absence.
+starting by D or S). Absent tiles are skipped. This allows for different inputs to be used as
+layers: one could have the map and other add annotations to cells by using tiles with transparency,
+for example. Note that the target file will only be created if it did not exist and will be drawn on
+top if it did exist.
+
+![Unix rules! example](examples/banner.jpg)
+
+```
+figlet -f banner 'Unix Rules!' | tr ' #' 'Xo' | mapGen.sh -f dg
+```
 
 ## Usage
 
 ```
-mapGen.sh [-s SIZE] [-f TILE_FOLDER] [-o OUTPUT_FILE] SOURCE_FILE
+mapGen.sh [-s SIZE] [-f TILE_FOLDER] [-o OUTPUT_FILE] [SOURCE_FILE]
 ```
 
 Where
@@ -86,6 +94,8 @@ Where
 - `OUTPUT_FILE` is the path to the resulting image (default `out.jpg`),
 - and `SOURCE_FILE` is the text file with the layout of the map.
 
+If `SOURCE_FILE` is not provided standard input will be used.
+
 ## Possibilities
 
 The direct mapping of characters in text file to beginning of tile image name gives flexibility to
diff --git a/mapGen/examples/banner.jpg b/mapGen/examples/banner.jpg
new file mode 100644
index 0000000..927e1c8
--- /dev/null
+++ b/mapGen/examples/banner.jpg
diff --git a/mapGen/mapGen.sh b/mapGen/mapGen.sh
index 0d77637..5568308 100755
--- a/mapGen/mapGen.sh
+++ b/mapGen/mapGen.sh
@@ -4,13 +4,46 @@
 #
 # Generate a map with ImageMagick from an input text file
 #
-# Usage: mapGen.sh [-s SIZE] [-f TILE_FOLDER] [-o OUTPUT_FILE] SOURCE_FILE
+# Usage: mapGen.sh [-s SIZE] [-f TILE_FOLDER] [-o OUTPUT_FILE] [SOURCE_FILE]
 
-usageMsg="Usage: mapGen.sh [-s SIZE] [-f TILE_FOLDER] [-o OUTPUT_FILE] SOURCE_FILE"
+usageMsg="Usage: mapGen.sh [-s SIZE] [-f TILE_FOLDER] [-o OUTPUT_FILE] [SOURCE_FILE]"
 cellSize=8
 tilesDir="./tiles"
 outputFile="out.jpg"
 
+drawMap () {
+	mapText=""
+	while read line; do
+		mapText="${mapText}${line}\n"
+	done
+	mapText="$(echo "$mapText" | sed 's|\\n|\n|g')"
+
+	height="$(echo "$mapText" | wc -l)"
+	#width="$(awk '{print length($0)}' "$inputFile" | sort -nr | sed 1q)"
+	width="$(echo "$mapText" | awk '{print length($0)}' | sort -nr | sed 1q)"
+	height=$((height*cellSize))
+	width=$((width*cellSize))
+
+	[ ! -f "$outputFile" ] && convert -size "$width"x"$height" xc:cyan "$outputFile"
+
+	row=0
+	col=0
+	echo "$mapText" | (
+	while read line; do
+		echo "$line" | (
+		while read -n1 char; do
+			tileFile="$(find $tilesDir -type f -maxdepth 1 | sed 's|.*/||' | grep "^$char" | shuf | sed 1q)"
+			if [ -n "$tileFile" ]; then
+				tileFile="${tilesDir}/${tileFile}"
+				convert "$outputFile" "$tileFile" -geometry +"$col"+"$row" -composite "$outputFile"
+			fi
+			col=$((col+cellSize))
+		done)
+		row=$((row+cellSize))
+		col=0
+	done)
+}
+
 while echo "$1" | grep '^-' >/dev/null; do
 	case "$1" in
 		"-s")
@@ -30,36 +63,8 @@ while echo "$1" | grep '^-' >/dev/null; do
 	esac
 done
 
-[ -z "$1" ] && echo "$usageMsg" >&2 && exit 1
-
+[ ! -d "$tilesDir" ] && echo "Directory not found: $tilesDir" >&2 && exit 1
 inputFile="$1"
-
+[ -z "$inputFile" ] && drawMap && exit
 [ ! -f "$inputFile" ] && echo "File not found: $inputFile" >&2 && exit 1
-[ ! -d "$tilesDir" ] && echo "Directory not found: $tilesDir" >&2 && exit 1
-
-height="$(wc -l <"$inputFile")"
-width="$(awk '{print length($0)}' "$inputFile" | sort -nr | sed 1q)"
-
-height=$((height*cellSize))
-width=$((width*cellSize))
-
-echo $width $height
-
-convert -size "$width"x"$height" xc:cyan "$outputFile"
-
-row=0
-col=0
-
-while read line; do
-	echo "$line" | (
-	while read -n1 char; do
-		tileFile="$(find $tilesDir | sed 's|.*/||' | grep "^$char" | shuf | sed 1q)"
-		tileFile="${tilesDir}/${tileFile}"
-		echo "$tileFile" | wc -l | grep 1 >/dev/null || continue
-		convert "$outputFile" "$tileFile" -geometry +"$col"+"$row" -composite "$outputFile" ||
-			convert "$outputFile" -fill red -draw "point $col,$row" "$outputFile"
-		col=$((col+cellSize))
-	done)
-	row=$((row+cellSize))
-	col=0
-done <"$inputFile"
+drawMap <"$inputFile"