guix/gnu/packages/patches/mecab-variable-param.patch

From 2396e90056706ef897acab3aaa081289c7336483 Mon Sep 17 00:00:00 2001
From: LEPILLER Julien <julien.lepiller@irisa.fr>
Date: Fri, 19 Apr 2019 11:48:39 +0200
Subject: [PATCH] Allow variable parameters

---
 mecab/src/param.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mecab/src/param.cpp b/mecab/src/param.cpp
index 65328a2..006b1b5 100644
--- a/mecab/src/param.cpp
+++ b/mecab/src/param.cpp
@@ -79,8 +79,12 @@ bool Param::load(const char *filename) {
     size_t s1, s2;
     for (s1 = pos+1; s1 < line.size() && isspace(line[s1]); s1++);
     for (s2 = pos-1; static_cast<long>(s2) >= 0 && isspace(line[s2]); s2--);
-    const std::string value = line.substr(s1, line.size() - s1);
+    std::string value = line.substr(s1, line.size() - s1);
     const std::string key   = line.substr(0, s2 + 1);
+
+    if(value.find('$') == 0) {
+        value = std::getenv(value.substr(1).c_str());
+    }
     set<std::string>(key.c_str(), value, false);
   }
 
-- 
2.20.1