From 5b8cf240687816a81d948bcb9e32f6077f74f10d Mon Sep 17 00:00:00 2001
From: Andrea Bonomi <andrea.bonomi@italiaonline.it>
Date: Thu, 8 Aug 2019 10:36:44 +0200
Subject: [PATCH] Pass arguments to function as environment variable
 MO_ALLOW_FUNCTION_ARGUMENTS

---
 demo/function-args           | 29 +++++++++++++++++++++++++++++
 demo/function-args-part1     |  1 +
 demo/function-args-part2     |  3 +++
 mo                           | 14 +++++++-------
 tests/function-args-read.env |  2 +-
 5 files changed, 41 insertions(+), 8 deletions(-)
 create mode 100755 demo/function-args
 create mode 100644 demo/function-args-part1
 create mode 100644 demo/function-args-part2

diff --git a/demo/function-args b/demo/function-args
new file mode 100755
index 0000000..83fa354
--- /dev/null
+++ b/demo/function-args
@@ -0,0 +1,29 @@
+#!/bin/bash
+#
+# This sources a simple script with the env. variables needed for the template.
+
+cd "$(dirname "$0")" # Go to the script's directory
+source ../mo
+
+export NAME="Alex"
+export ARRAY=( AAA BBB CCC )
+
+# Include an external template
+INCLUDE() {
+    cat "$MO_FUNCTION_ARGS"
+}
+
+# Print section title
+TITLE() {
+    echo "+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+"
+    echo "$MO_FUNCTION_ARGS"
+    echo "+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+"
+}
+
+cat <<EOF | mo -u
+{{TITLE Part 1}}
+{{INCLUDE function-args-part1}}
+
+{{TITLE Part 2}}
+{{INCLUDE function-args-part2}}
+EOF
diff --git a/demo/function-args-part1 b/demo/function-args-part1
new file mode 100644
index 0000000..c23dfd1
--- /dev/null
+++ b/demo/function-args-part1
@@ -0,0 +1 @@
+Hello, my name is {{NAME}}.
diff --git a/demo/function-args-part2 b/demo/function-args-part2
new file mode 100644
index 0000000..ce398a9
--- /dev/null
+++ b/demo/function-args-part2
@@ -0,0 +1,3 @@
+{{#ARRAY}}
+    * {{.}}
+{{/ARRAY}}
diff --git a/mo b/mo
index 271627c..3015011 100755
--- a/mo
+++ b/mo
@@ -62,8 +62,7 @@
 #                       options and arguments. This puts the content from the
 #                       template directly into an eval statement. Use with
 #                       extreme care.
-# MO_ARGS             - Arguments passed to the function,
-#                       only if MO_ALLOW_FUNCTION_ARGUMENTS is unset
+# MO_FUNCTION_ARGS    - Arguments passed to the function
 # MO_FAIL_ON_UNSET    - When set to a non-empty value, expansion of an unset
 #                       env variable will be aborted with an error.
 # MO_FALSE_IS_EMPTY   - When set to a non-empty value, the string "false"
@@ -156,16 +155,17 @@ mo() (
 #
 # Returns nothing.
 moCallFunction() {
-    local moArgs
+    local moArgs moFunctionArgs
+
+    moArgs=()
+    moTrimWhitespace moFunctionArgs "$3"
 
     # shellcheck disable=SC2031
     if [[ -n "${MO_ALLOW_FUNCTION_ARGUMENTS-}" ]]; then
         moArgs=$3
-        echo -n "$2" | eval "$1" "$moArgs"
-    else
-        moTrimWhitespace moArgs "$3"
-        echo -n "$2" | MO_ARGS="$moArgs" eval "$1"
     fi
+
+    echo -n "$2" | MO_FUNCTION_ARGS="$moFunctionArgs" eval "$1" "$moArgs"
 }
 
 
diff --git a/tests/function-args-read.env b/tests/function-args-read.env
index 2ff7a01..0257bfd 100644
--- a/tests/function-args-read.env
+++ b/tests/function-args-read.env
@@ -1,3 +1,3 @@
 testArgs() {
-    echo "$MO_ARGS"
+    echo "$MO_FUNCTION_ARGS"
 }