1 files changed, 55 insertions, 0 deletions
diff --git a/bin/spt b/bin/spt
new file mode 100755
index 0000000..e237d93
--- /dev/null
+++ b/bin/spt
@@ -0,0 +1,55 @@
+#!/bin/bash
+
+###
+# Single pass tabulate.
+#
+# Turn grid-aligned tables into tab-separated values
+#  using the first line as a template.
+# Pre-existing tabs are preserved,
+#  which is probably not good.
+##
+# TODO:
+# - Optionally require more than one space for column separation.
+
+shopt -s extglob
+
+spitline(){
+	declare -i prevtab=0
+	for tabstop in ${tabstops[@]}
+	do
+		# Strip trailing spaces.
+		field=${line:$prevtab:$((tabstop-prevtab))}
+		field=${field%%*( )}
+		printf '%s\t' "$field"
+		prevtab=$tabstop
+	done
+	printf '%s\n' "${line:$prevtab}"
+}
+
+##
+# First line:
+##
+# The tab stops are where stretches of empty space end.
+IFS=$'\n'
+read -r firstline
+declare -i skip=1
+for ((i=0;i<${#firstline};i++))
+do
+	case ${firstline:$i:1} in
+		\ )
+			skip=0
+	;;	*)
+			[[ $skip -eq 0 ]] && tabstops+=($i)
+			skip=1
+	esac
+done
+#echo >&2 ${tabstops[@]}
+line=$firstline
+spitline
+
+##
+# All other lines:
+declare -i prevtab
+while read -r line
+do	spitline
+done