From 11588c639e8912f1b28e981c1a2a0e4306dbd093 Mon Sep 17 00:00:00 2001
From: Chun Kuan Lee <ken2812221@gmail.com>
Date: Sat, 16 Jun 2018 02:31:26 +0000
Subject: [PATCH] Replace boost program_options

---
 src/util.cpp | 47 ++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 38 insertions(+), 9 deletions(-)

diff --git a/src/util.cpp b/src/util.cpp
index ab262b406..97b5205ab 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -72,7 +72,6 @@
 #endif
 
 #include <boost/interprocess/sync/file_lock.hpp>
-#include <boost/program_options/detail/config_file.hpp>
 #include <boost/thread.hpp>
 #include <openssl/crypto.h>
 #include <openssl/rand.h>
@@ -811,17 +810,47 @@ fs::path GetConfigFile(const std::string& confPath)
     return AbsPathForConfigVal(fs::path(confPath), false);
 }
 
+static std::string TrimString(const std::string& str, const std::string& pattern)
+{
+    std::string::size_type front = str.find_first_not_of(pattern);
+    if (front == std::string::npos) {
+        return std::string();
+    }
+    std::string::size_type end = str.find_last_not_of(pattern);
+    return str.substr(front, end - front + 1);
+}
+
+static std::vector<std::pair<std::string, std::string>> GetConfigOptions(std::istream& stream)
+{
+    std::vector<std::pair<std::string, std::string>> options;
+    std::string str, prefix;
+    std::string::size_type pos;
+    while (std::getline(stream, str)) {
+        if ((pos = str.find('#')) != std::string::npos) {
+            str = str.substr(0, pos);
+        }
+        const static std::string pattern = " \t\r\n";
+        str = TrimString(str, pattern);
+        if (!str.empty()) {
+            if (*str.begin() == '[' && *str.rbegin() == ']') {
+                prefix = str.substr(1, str.size() - 2) + '.';
+            } else if ((pos = str.find('=')) != std::string::npos) {
+                std::string name = prefix + TrimString(str.substr(0, pos), pattern);
+                std::string value = TrimString(str.substr(pos + 1), pattern);
+                options.emplace_back(name, value);
+            }
+        }
+    }
+    return options;
+}
+
 bool ArgsManager::ReadConfigStream(std::istream& stream, std::string& error, bool ignore_invalid_keys)
 {
     LOCK(cs_args);
 
-    std::set<std::string> setOptions;
-    setOptions.insert("*");
-
-    for (boost::program_options::detail::config_file_iterator it(stream, setOptions), end; it != end; ++it)
-    {
-        std::string strKey = std::string("-") + it->string_key;
-        std::string strValue = it->value[0];
+    for (const std::pair<std::string, std::string>& option : GetConfigOptions(stream)) {
+        std::string strKey = std::string("-") + option.first;
+        std::string strValue = option.second;
 
         if (InterpretNegatedOption(strKey, strValue)) {
             m_config_args[strKey].clear();
@@ -831,7 +860,7 @@ bool ArgsManager::ReadConfigStream(std::istream& stream, std::string& error, boo
 
         // Check that the arg is known
         if (!IsArgKnown(strKey, error) && !ignore_invalid_keys) {
-            error = strprintf("Invalid configuration value %s", it->string_key.c_str());
+            error = strprintf("Invalid configuration value %s", option.first.c_str());
             return false;
         }
     }