Read command line args from a file

src/dfmt/config.d

@@ -83,6 +83,10 @@ struct Config
     @Help("Newline style can be 'cr', 'lf', or 'crlf'")
     Newlines newlineType;
 
+    ///
+    @Help("Insert spaces after 'if', 'while', 'foreach', etc, and before the '('")
+    bool spaceAfterBlockKeywords;
+
     /**
      * Returns:
      *     true if the configuration is valid
@@ -100,6 +104,28 @@ struct Config
     }
 }
 
+/**
+ * Reads arguments from a file at the given path into the given string array
+ */
+void readConfig(string path, ref string[] args)
+{
+    import std.stdio : File;
+    import std.file : exists;
+    import std.array : empty, RefAppender;
+
+    if (!exists(path))
+        return;
+    auto f = File(path);
+
+    auto app = RefAppender!(string[])(&args);
+
+	import std.algorithm : map, copy, sort, uniq, filter;
+
+	foreach (a; f.byLine().filter!(a => !a.empty).map!(a => a.idup))
+		app.put(a);
+    app.data[1 .. $].sort();
+}
+
 private struct Help
 {
     string text;

src/dfmt/main.d

@@ -12,13 +12,17 @@ else
 {
     import std.array : front, popFront;
     import std.stdio : stdout, stdin, stderr, writeln, File;
-    import dfmt.config : Config, getHelp;
+    import dfmt.config : Config, getHelp, readConfig;
     import dfmt.formatter : format;
+    import std.path : buildPath, expandTilde;
 
     int main(string[] args)
     {
         bool inplace = false;
         Config config;
+        string configPath = expandTilde("~/.config/dfmt/dfmtrc");
+        readConfig(configPath, args);
+
         static if (__VERSION__ >= 2067)
         {
             import std.getopt : getopt, defaultGetoptPrinter;
@@ -35,7 +39,8 @@ else
                 "outdentAttributes", getHelp!(Config.outdentAttributes), &config.outdentAttributes,
                 "splitOperatorAtEnd", getHelp!(Config.splitOperatorAtEnd), &config.splitOperatorAtEnd,
                 "spaceAfterCast", getHelp!(Config.spaceAfterCast), &config.spaceAfterCast,
-                "newlineType", getHelp!(Config.newlineType), &config.newlineType);
+                "newlineType", getHelp!(Config.newlineType), &config.newlineType,
+                "spaceAfterBlockKeywords", getHelp!(Config.spaceAfterBlockKeywords), &config.spaceAfterBlockKeywords);
 
             if (getOptResult.helpWanted)
             {