Changeset 30722

Timestamp:

2016-08-17T17:18:21+12:00 (8 years ago)

Author:

ak19

Message:

Remove repeated empty lines, leaving just a single blank line between lines that were separated by many more blank lines.

File:

• other-projects/gti/remove_extra_lines.sh (modified) (2 diffs)

other-projects/gti/remove_extra_lines.sh

@@ -4 +4 @@
 
 CLEANVERSION_NAME="$1.clean"
+
+# http://stackoverflow.com/questions/2613800/how-to-convert-dos-windows-newline-crlf-to-unix-newline-n-in-bash-script
+#sed $'s/\r$//' $1 > $CLEANVERSION_NAME
+#mv $CLEANVERSION_NAME $1
 
 # echo $1
@@ -33 +37 @@
 sed -e '/\s*#.*$/d' -e '/^\s*$/d' $1 > $CLEANVERSION_NAME
 
+
 # if the *.clean file is actually empty, print a message
 # http://www.unix.com/shell-programming-and-scripting/21753-check-if-file-empty.html
 if [[ ! -s $CLEANVERSION_NAME ]] ; then
     echo "@@@ $1 only has comments and empty lines/spaces."
+else
+
+
+    # remove empty newlines, modifying the file in place.
+    # http://stackoverflow.com/questions/16414410/delete-empty-lines-using-sed
+    # http://unix.stackexchange.com/questions/76061/can-sed-remove-double-newline-characters
+    #sed -i '/^$/d' $1
+
+
+    # remove empty spaces from lines that are purely empty spaces, but leave
+    # the newline intact, as we'll remove it further below.
+    sed -e 's/^\s*$//' $1 > $1.tmp
+
+    # If there's multiple new lines (3 or more) make them just 2. So leave
+    # one blank line between lines wherever there were many more blank lines
+    # http://stackoverflow.com/questions/922449/how-can-i-replace-mutliple-empty-lines-with-a-single-empty-line-in-bash
+    # "cat with the -s option causes it to remove repeated empty lines from its output"
+    # Beware: on Solaris, the -s option to cat can mean "cat is silent about missing files"
+    cat -s $1.tmp > $1
 fi ;
 rm $CLEANVERSION_NAME