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+#
+# parseini --- parses 'ini' style configuration files.
+#
+# Usage:
+# awk -f parseini S=<section> P=<param> <ini file>
+#
+# if section is an empty string, then we use the default section
+#
+# example ini file:
+#
+# fruit = apple
+# fruit = pear
+# multiline = this is a multiline \
+# parameter
+#
+# # this is a comment
+#
+# [colors]
+# red = yes
+# green = no
+# blue = maybe
+#
+# [ocean]
+# fish = red
+# fish = blue
+#
+# example usage:
+# > awk -f parseini S=ocean P=fish testfile.ini
+# would return:
+# red
+# blue
+#
+
+BEGIN {
+ readlines = 1
+ implied = 1
+}
+
+# remove lines starting with #, but not #!
+/^#[^!]/ {next}
+
+# skip blank
+/^[ \r\t]*$/ {next}
+
+# we want to read the lines of the matched section
+# and disable for other sections
+/^\[.+\][ \r\t]*$/ {
+ continueline = 0
+ if (S && implied) {
+ nline = 0
+ implied = 0
+ }
+ if (S && match($0, "^\\[" S "\\][ \n]*")) {
+ # we found the section, so start reading.
+ readlines = 1
+ }
+ else {
+ # no section, so stop reading lines
+ if (readlines) readlines = 0
+ }
+ next
+}
+
+# when reading, store lines.
+
+{
+ if (!readlines) next
+ line[nline++] = $0
+ if ($0 ~ /\\[ \r\t]*$/)
+ continueline = 1
+ else
+ continueline = 0
+}
+
+# process the read lines lines, matching parameters
+
+END {
+ # if section is set but implied is still true
+ # then we never found the section, so use everything
+ if (S && implied) {
+ nline = 0
+ }
+
+ # if have P then find P in read lines and get values
+ if (P) {
+ MATCH = "^[ \r\t]*" P "[ \r\t]*="
+ continueline = 0
+ for (x = 0; x < nline; ++x) {
+ v = line[x]
+ if (continueline) {
+ sub(/[ \r\t]+$/, "", v)
+ if (v ~ /\\$/) {
+ v = substr(v, 1, length(v)-1)
+ sub(/[ \r\t]+$/, "", v)
+ }
+ if (v) value[nvalue++] = v
+ }
+ else if (v ~ MATCH) {
+ sub(MATCH, "", v)
+ sub(/^[ \r\t]+/, "", v)
+ sub(/[ \r\t]+$/, "", v)
+ if (v ~ /\\$/) {
+ continueline = 1
+ v = substr(v, 1, length(v)-1)
+ sub(/[ \r\t]+$/, "", v)
+ }
+ if (v) value[nvalue++] = v
+ }
+ }
+ # copy parameter definition to output array
+ nline = nvalue
+ for (x = 0; x < nvalue; ++x)
+ line[x] = value[x]
+ }
+
+ # trim all leading & trailing whitespace;
+ # except for leading whitespace in continuation lines,
+
+ for (x = 0; x < nline; ++x) {
+ sub(/^[ \r\t]+/, "", line[x])
+ sub(/[ \r\t]+$/, "", line[x])
+ }
+
+ # output the final result
+ for (x = 0; x < nline; ++x)
+ print line[x]
+
+ if (nline) exit 0
+ else exit 1
+}