Add `-version` option to get just the version

Adds a `-version` or `--version` option to print just the version
of the program for bitcoind, bitcoin-cli and bitcoin-qt.

Also make it that `-help` can be used to display the help (as well as
existing `--help`). Up to now, `-help` was the only option that didn't
work with either one or two dashes.

1 files changed, 10 insertions, 9 deletions

diff --git a/src/qt/utilitydialog.cpp b/src/qt/utilitydialog.cpp
index 01b710e876..435c6a4368 100644
--- a/src/qt/utilitydialog.cpp
+++ b/src/qt/utilitydialog.cpp
@@ -57,21 +57,20 @@ void AboutDialog::on_buttonBox_accepted()
 }
 
 /** "Help message" dialog box */
-HelpMessageDialog::HelpMessageDialog(QWidget *parent) :
+HelpMessageDialog::HelpMessageDialog(QWidget *parent, bool versionOnly) :
     QDialog(parent),
     ui(new Ui::HelpMessageDialog)
 {
     ui->setupUi(this);
     GUIUtil::restoreWindowGeometry("nHelpMessageDialogWindow", this->size(), this);
 
-    header = tr("Bitcoin Core") + " " + tr("version") + " " +
-        QString::fromStdString(FormatFullVersion()) + "\n\n" +
-        tr("Usage:") + "\n" +
+    QString version = tr("Bitcoin Core") + " " + tr("version") + " " + QString::fromStdString(FormatFullVersion());
+    QString header = tr("Usage:") + "\n" +
         "  bitcoin-qt [" + tr("command-line options") + "]                     " + "\n";
 
-    coreOptions = QString::fromStdString(HelpMessage(HMM_BITCOIN_QT));
+    QString coreOptions = QString::fromStdString(HelpMessage(HMM_BITCOIN_QT));
 
-    uiOptions = tr("UI options") + ":\n" +
+    QString uiOptions = tr("UI options") + ":\n" +
         "  -choosedatadir            " + tr("Choose data directory on startup (default: 0)") + "\n" +
         "  -lang=<lang>              " + tr("Set language, for example \"de_DE\" (default: system locale)") + "\n" +
         "  -min                      " + tr("Start minimized") + "\n" +
@@ -81,7 +80,10 @@ HelpMessageDialog::HelpMessageDialog(QWidget *parent) :
     ui->helpMessageLabel->setFont(GUIUtil::bitcoinAddressFont());
 
     // Set help message text
-    ui->helpMessageLabel->setText(header + "\n" + coreOptions + "\n" + uiOptions);
+    if(versionOnly)
+        ui->helpMessageLabel->setText(version);
+    else
+        ui->helpMessageLabel->setText(version + "\n" + header + "\n" + coreOptions + "\n" + uiOptions);
 }
 
 HelpMessageDialog::~HelpMessageDialog()
@@ -93,8 +95,7 @@ HelpMessageDialog::~HelpMessageDialog()
 void HelpMessageDialog::printToConsole()
 {
     // On other operating systems, the expected action is to print the message to the console.
-    QString strUsage = header + "\n" + coreOptions + "\n" + uiOptions + "\n";
-    fprintf(stdout, "%s", strUsage.toStdString().c_str());
+    fprintf(stdout, "%s\n", qPrintable(ui->helpMessageLabel->text()));
 }
 
 void HelpMessageDialog::showOrPrint()