v0.10.2 Bugfix for the pandoc version

* The previous comparison for 'PANDOC_VERSION' did not work in some versions.
* A simple method was introduced in pandoc 2.7.3 to compare versions, but we cannot ensure that this version is always available.
* Thus, a new function was introduced to compare the versions, without requiring the 2.7.3 or higher.

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: acronymsdown
 Type: Package
 Title: Acronyms and Glossaries Support for RMarkdown
-Version: 0.10.1
+Version: 0.10.2
 Author: Remy Chaput
 Maintainer: remy chaput <rchaput.pro@gmail.com>
 Description: Adds support for list of acronyms (or glossaries) for RMarkdown

inst/parse-acronyms.lua

@@ -52,14 +52,36 @@ function warn(...)
     io.stderr:write("[WARNING][acronymsdown] ", msg, "\n")
 end
 
+-- Helper function to determine pandoc's version.
+-- `version` must be a table of numbers, e.g., `{2, 17, 0, 1}`
+function isAtLeastVersion(version)
+    -- `PANDOC_VERSION` exists since 2.1, but we never know...
+    if PANDOC_VERSION == nil then
+        return false
+    end
+    -- Loop up over the components
+    -- e.g., `2.17.0.1` => [0]=2, [1]=17, [2]=0, [3]=1
+    for k, v in ipairs(version) do
+        if PANDOC_VERSION[k] == nil or PANDOC_VERSION[k] < version[k] then
+            -- Examples: 2.17 < 2.17.0.1, or 2.16 < 2.17
+            return false
+        elseif PANDOC_VERSION[k] > version[k] then
+            -- Example: 2.17 > 2.16.2 (we do not need to check the next!)
+            return true
+        end
+    end
+    -- At this point, all components are equal
+    return true
+end
+
 
 -- Helper function to determine whether a metadata field is a list.
 function isMetaList(field)
     -- We want to know whether we have multiple values (MetaList).
     -- Pandoc 2.17 introduced a compatibility-breaking change for this:
     --  the `.tag` is no longer present in >= 2.17 ;
     --  the `pandoc.utils.type` function is only available in >= 2.17
-    if PANDOC_VERSION ~= nil and tostring(PANDOC_VERSION) >= "2.17" then
+    if isAtLeastVersion({2, 17}) then
         -- Use the new `pandoc.utils.type` function
         return pandoc.utils.type(field) == "List"
     else