From: Michael Orlitzky <michael@orlitzky.com>
Date: Mon, 14 Nov 2022 13:26:15 +0000 (-0500)
Subject: utils/parse_directives: new automated parser for directive names.
X-Git-Tag: v0.4~2
X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=b6e946a3a087884ecaa250960103a54b1d81169a;p=nagios-mode.git

utils/parse_directives: new automated parser for directive names.

This probably isn't perfect, but it finds all of the directives we
already had (and some new ones), so it doesn't make things worse.
---

diff --git a/utils/parse_directives b/utils/parse_directives
new file mode 100755
index 0000000..5d71c6f
--- /dev/null
+++ b/utils/parse_directives
@@ -0,0 +1,63 @@
+#!/bin/sh
+
+# Parse directive names out of Nagios' xdata/xodtemplate.c.
+
+EXIT_USAGE=1
+EXIT_INPUT_FILE_DOESNT_EXIST=2
+
+posix_mktemp(){
+  # Securely create a temporary file under ${TMPDIR} using the
+  # template "tmpXXXXXX", and echo the result to stdout. This works
+  # around the absence of "mktemp" in the POSIX standard.
+  printf 'mkstemp(template)' | m4 -D template="${TMPDIR:-/tmp}/tmpXXXXXX"
+}
+
+if [ $# -lt 1 ]; then
+    echo "Usage: $0 <path-to-xodtemplate.c>"
+    exit $EXIT_USAGE
+fi
+
+
+INFILE="${1}"
+TEMPFILE="$(posix_mktemp)"
+
+if [ ! -f "$INFILE" ]; then
+    echo "Error: input file $INFILE doesn't exist."
+    exit $EXIT_INPUT_FILE_DOESNT_EXIST
+fi
+
+# The list of weekday names, taken from xdata/xodtemplate.c. The
+# Nagios strcmp parser doesn't look for them individually. Since
+# they're unlikely to change, appending them manually sounds
+# reasonable to me.
+printf '"sunday"
+"monday"
+"tuesday"
+"wednesday"
+"thursday"
+"friday"
+"saturday"
+' >> "${TEMPFILE}"
+
+# This grabs all of the variable names that are explicitly checked for
+# with strcmp in xdata/xodtemplate.c. We include these because some
+# valid variable names (e.g. "hostgroups") are implicitly mapped to
+# "real" variables whose names differ.
+#
+# The "name", "register", and "use" directives are special (literally,
+# they get the "special" font in nagios-mode.el), so we drop them from
+# the list.
+#
+# Before we parse the names, though, we move each !strcmp to its own
+# line, which greatly simplifies the parsing.
+VARCMP_REGEX='.*!strcmp(variable,[[:space:]]*"\([A-Za-z_]\{1,\}\)").*'
+sed "s/\!strcmp(/\n\!strcmp(/g" < "${INFILE}" \
+  | sed -n "s/${VARCMP_REGEX}/\"\1\"/p"       \
+  | sed '/^"name\|use\|register"$/d'          \
+  >> "${TEMPFILE}"
+
+# Finally, sort the list and print it.
+sort < "${TEMPFILE}" | uniq
+
+# ... and clean up
+rm "${TEMPFILE}"