config.cc: extract parts of applyConfigFile into applyConfig

This moves the actual parsing of configuration contents into applyConfig
which applyConfigFile is then going to call. By changing this we can now
test the configuration file parsing without actually create a file on
disk.

src/libutil/config.cc

@@ -65,60 +65,63 @@ void Config::getSettings(std::map<std::string, SettingInfo> & res, bool override
             res.emplace(opt.first, SettingInfo{opt.second.setting->to_string(), opt.second.setting->description});
 }
 
+void AbstractConfig::applyConfig(const std::string & contents, const std::string & path) {
+    unsigned int pos = 0;
+
+    while (pos < contents.size()) {
+        string line;
+        while (pos < contents.size() && contents[pos] != '\n')
+            line += contents[pos++];
+        pos++;
+
+        string::size_type hash = line.find('#');
+        if (hash != string::npos)
+            line = string(line, 0, hash);
+
+        vector<string> tokens = tokenizeString<vector<string> >(line);
+        if (tokens.empty()) continue;
+
+        if (tokens.size() < 2)
+            throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
+
+        auto include = false;
+        auto ignoreMissing = false;
+        if (tokens[0] == "include")
+            include = true;
+        else if (tokens[0] == "!include") {
+            include = true;
+            ignoreMissing = true;
+        }
+
+        if (include) {
+            if (tokens.size() != 2)
+                throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
+            auto p = absPath(tokens[1], dirOf(path));
+            if (pathExists(p)) {
+                applyConfigFile(p);
+            } else if (!ignoreMissing) {
+                throw Error("file '%1%' included from '%2%' not found", p, path);
+            }
+            continue;
+        }
+
+        if (tokens[1] != "=")
+            throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
+
+        string name = tokens[0];
+
+        vector<string>::iterator i = tokens.begin();
+        advance(i, 2);
+
+        set(name, concatStringsSep(" ", Strings(i, tokens.end()))); // FIXME: slow
+    };
+}
+
 void AbstractConfig::applyConfigFile(const Path & path)
 {
     try {
         string contents = readFile(path);
-
+        applyConfig(contents, path);
-        unsigned int pos = 0;
-
-        while (pos < contents.size()) {
-            string line;
-            while (pos < contents.size() && contents[pos] != '\n')
-                line += contents[pos++];
-            pos++;
-
-            string::size_type hash = line.find('#');
-            if (hash != string::npos)
-                line = string(line, 0, hash);
-
-            vector<string> tokens = tokenizeString<vector<string> >(line);
-            if (tokens.empty()) continue;
-
-            if (tokens.size() < 2)
-                throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
-
-            auto include = false;
-            auto ignoreMissing = false;
-            if (tokens[0] == "include")
-                include = true;
-            else if (tokens[0] == "!include") {
-                include = true;
-                ignoreMissing = true;
-            }
-
-            if (include) {
-                if (tokens.size() != 2)
-                    throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
-                auto p = absPath(tokens[1], dirOf(path));
-                if (pathExists(p)) {
-                    applyConfigFile(p);
-                } else if (!ignoreMissing) {
-                    throw Error("file '%1%' included from '%2%' not found", p, path);
-                }
-                continue;
-            }
-
-            if (tokens[1] != "=")
-                throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
-
-            string name = tokens[0];
-
-            vector<string>::iterator i = tokens.begin();
-            advance(i, 2);
-
-            set(name, concatStringsSep(" ", Strings(i, tokens.end()))); // FIXME: slow
-        };
     } catch (SysError &) { }
 }
 

src/libutil/config.hh

@@ -33,6 +33,7 @@ public:
 
     virtual void getSettings(std::map<std::string, SettingInfo> & res, bool overridenOnly = false) = 0;
 
+    void applyConfig(const std::string & contents, const std::string & path = "<unknown>");
     void applyConfigFile(const Path & path);
 
     virtual void resetOverriden() = 0;