Also provide help on adapter options

Adapters often add their own options to thoso of the engine in the
Engine Settings dialog. Polyglot, for instance, has many options,
their names all starting with "Polyglot ...". We adopt this as a
convention, so that XBoard can compare the adapter name (the name
of the program actually run, if that is different from the name
of the engine binary) with the start of the option name for which
help is requested. If there is a match it will conclude we are dealing
with an adapter option, and will consult the adapter manual (for an
option without the adapter-name prefix) instead of the engine manual.

diff --git a/dialogs.c b/dialogs.c
index 30b2ad5..e9a1718 100644 (file)
--- a/dialogs.c
+++ b/dialogs.c
@@ -2503,7 +2503,7 @@ void
 DisplayHelp (char *name)
 {
     static char *xboardMan, *manText[2], tidy[MSG_SIZ], engMan[MSG_SIZ];
-    char buf[MSG_SIZ], *eng;
+    char buf[MSG_SIZ], adapter[MSG_SIZ], *eng;
     int n = 0;
     FILE *f;
     if(!xboardMan) {
@@ -2512,7 +2512,13 @@ DisplayHelp (char *name)
     }
     if(currentCps) { // for engine options we have to look in engine manual
        snprintf(buf, MSG_SIZ, "man -w ");            // get (tidied) engine name in buf
+       TidyProgramName(currentCps->program, "localhost", adapter);       // name of binary we are actually running
        TidyProgramName(currentCps == &first ? appData.firstChessProgram : appData.secondChessProgram, "localhost", buf+7);
+       if(strcmp(buf+7, adapter) && StrCaseStr(name, adapter) == name) { // option starts with name of apparent proxy for engine
+           safeStrCpy(buf+7, adapter, MSG_SIZ-7);    // use adapter manual
+           name += strlen(adapter);                  // strip adapter name of option
+           while(*name == ' ') name++;
+       }
        if(strcmp(buf, tidy)) {                       // is different engine from last time
            FREE(manText[1]); manText[1] = NULL;      // so any currently held text is worthless
            safeStrCpy(tidy, buf, MSG_SIZ);           // remember current engine