feat(meshtastic): extract LoBBS plugin library

apps/Msg/MsgCommon.cpp

@@ -0,0 +1,61 @@
+#if !MESHTASTIC_EXCLUDE_LOBBS
+
+#include "MsgCommon.h"
+#include "../../LoBBSCommandRegistry.h"
+#include "../../LoBBSHooks.h"
+#include "../../LoBBSResponse.h"
+#include "../Mail/MailRecords.h"
+#include "../News/NewsRecords.h"
+#include <lodb/LoDB.h>
+#include <string>
+
+#include "LoBBSStackGuard.h"
+
+bool lobbsMsgShiftIndex(LoBBSCommandCtx &ctx, size_t count, const char *usage, const char *badNumMsg, uint32_t &idxOut)
+{
+    for (size_t i = 0; i < count; i++)
+        lobbsArgShift(ctx);
+    const char *beforeNum = lobbsArgPeek(ctx);
+    if (!lobbsArgShiftUint(ctx, idxOut)) {
+        LoBBSResponse resp;
+        lobbsResponseSetError(resp, beforeNum ? badNumMsg : usage);
+        lobbsCommandReplyResponse(ctx, resp);
+        return false;
+    }
+    return true;
+}
+
+static bool lobbsMsgTryDisplayRecord(const LoScalar &record, uint32_t readField, std::string &lineOut)
+{
+    std::string title;
+    if (!record.getString(LODB_F_TITLE, title))
+        return false;
+    if (!title.empty() && title[0] == '[' && record.has(readField)) {
+        lineOut = title;
+        return true;
+    }
+    if (title.find("From:") == 0 && record.has(LODB_F_DESCRIPTION)) {
+        std::string body;
+        if (record.getString(LODB_F_DESCRIPTION, body)) {
+            lineOut = title + "\n" + body;
+            return true;
+        }
+    }
+    return false;
+}
+
+static void displayMsgHuman(LoBBSCommandCtx *ctx, LoScalar &value, const LoScalar &record)
+{
+    (void)ctx;
+    std::string line;
+    if (lobbsMsgTryDisplayRecord(record, MailField::FIELD_READ, line) ||
+        lobbsMsgTryDisplayRecord(record, NewsField::FIELD_LIST_READ, line))
+        value.setString(LODB_F_TITLE, line);
+}
+
+void lobbsMsgRegisterDisplay()
+{
+    lobbsAddFilter("display_human", displayMsgHuman, LOBBS_HOOK_PRIORITY_FEATURE);
+}
+
+#endif