remove some unused typedefs

Change-Id: I98c1e7eaa66b7afb05255a017a3de54714637501
Reviewed-on: https://gerrit.libreoffice.org/17491
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/bin/find-unused-typedefs.sh b/bin/find-unused-typedefs.sh
new file mode 100755
index 000000000000..a8039f552178
--- /dev/null
+++ b/bin/find-unused-typedefs.sh
@@ -0,0 +1,26 @@
+#
+# This is a pretty brute-force approach. It takes several hours to run on a top-spec MacbookAir.
+# It also produces some false positives, so it requires careful examination and testing of the results.
+#
+# Algorithm Summary:
+#   First we find all #defines,
+#   then we search for each of them in turn,
+#   and if we find only one instance of a #define, we print it out.
+#
+# Algorithm Detail:
+# (1) find #defines, excluding the externals folder
+# (2) extract just the constant name from the search results
+# (3) trim blank lines
+# (4) sort the results, mostly so I have an idea how far along the process is
+# (5) for each result:
+#   (6) grep for the constant
+#   (7) use awk to to check if only one match for a given constant was found
+#   (8) if so, generate a sed command to remove the #define
+#
+bin/find-unused-typedefs.py \
+  | sort \
+  | uniq \
+  | xargs -Ixxx -n 1 -P 8 sh -c \
+    "( git grep -w 'xxx' | awk -f bin/find-unused-defines.awk -v p1=xxx ) && echo \"xxx\" 1>&2"
+
+