Use std::string_view and fmtlib across all libraries (#3402)

- Twine, StringRef, Format, and NativeFormatting have been removed
- Logging now uses fmtlib style formatting
- Nearly all uses of wpi::outs/errs have been replaced with fmt::print() or
std::puts()/std::fputs() (for unformatted strings).
- A wpi/fmt/raw_ostream.h header has been added to enable
fmt::print() with wpi::raw_ostream

wpilibc/src/main/native/include/frc/shuffleboard/LayoutType.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -25,7 +25,7 @@ class LayoutType {
    * Gets the string type of the layout as defined by that layout in
    * Shuffleboard.
    */
-  wpi::StringRef GetLayoutName() const;
+  std::string_view GetLayoutName() const;
 
  private:
   const char* m_layoutName;

wpilibc/src/main/native/include/frc/shuffleboard/RecordingController.h

@@ -6,11 +6,11 @@
 
 #include <memory>
 #include <string>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableInstance.h>
 #include <wpi/SmallVector.h>
-#include <wpi/StringRef.h>
 
 #include "frc/shuffleboard/ShuffleboardEventImportance.h"
 
@@ -23,10 +23,10 @@ class RecordingController final {
 
   void StartRecording();
   void StopRecording();
-  void SetRecordingFileNameFormat(wpi::StringRef format);
+  void SetRecordingFileNameFormat(std::string_view format);
   void ClearRecordingFileNameFormat();
 
-  void AddEventMarker(wpi::StringRef name, wpi::StringRef description,
+  void AddEventMarker(std::string_view name, std::string_view description,
                       ShuffleboardEventImportance importance);
 
  private:

wpilibc/src/main/native/include/frc/shuffleboard/Shuffleboard.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 #include "frc/shuffleboard/RecordingController.h"
 #include "frc/shuffleboard/ShuffleboardEventImportance.h"
@@ -77,7 +77,7 @@ class Shuffleboard final {
    * @param title the title of the tab
    * @return the tab with the given title
    */
-  static ShuffleboardTab& GetTab(wpi::StringRef title);
+  static ShuffleboardTab& GetTab(std::string_view title);
 
   /**
    * Selects the tab in the dashboard with the given index in the range
@@ -93,7 +93,7 @@ class Shuffleboard final {
    *
    * @param title the title of the tab to select
    */
-  static void SelectTab(wpi::StringRef title);
+  static void SelectTab(std::string_view title);
 
   /**
    * Enables user control of widgets containing actuators: speed controllers,
@@ -141,7 +141,7 @@ class Shuffleboard final {
    *
    * @param format the format for the
    */
-  static void SetRecordingFileNameFormat(wpi::StringRef format);
+  static void SetRecordingFileNameFormat(std::string_view format);
 
   /**
    * Clears the custom name format for recording files. New recordings will use
@@ -163,7 +163,8 @@ class Shuffleboard final {
    * @param description a description of the event
    * @param importance  the importance of the event
    */
-  static void AddEventMarker(wpi::StringRef name, wpi::StringRef description,
+  static void AddEventMarker(std::string_view name,
+                             std::string_view description,
                              ShuffleboardEventImportance importance);
 
   /**
@@ -177,7 +178,7 @@ class Shuffleboard final {
    * @param name        the name of the event
    * @param importance  the importance of the event
    */
-  static void AddEventMarker(wpi::StringRef name,
+  static void AddEventMarker(std::string_view name,
                              ShuffleboardEventImportance importance);
 
  private:

wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardEventImportance.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -14,7 +14,7 @@ namespace frc {
 
 enum ShuffleboardEventImportance { kTrivial, kLow, kNormal, kHigh, kCritical };
 
-inline wpi::StringRef ShuffleboardEventImportanceName(
+inline std::string_view ShuffleboardEventImportanceName(
     ShuffleboardEventImportance importance) {
   switch (importance) {
     case kTrivial:

wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardInstance.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include "frc/shuffleboard/ShuffleboardRoot.h"
 #include "frc/shuffleboard/ShuffleboardTab.h"
@@ -19,7 +20,7 @@ class ShuffleboardInstance final : public ShuffleboardRoot {
   ShuffleboardInstance(ShuffleboardInstance&&) = default;
   ShuffleboardInstance& operator=(ShuffleboardInstance&&) = default;
 
-  frc::ShuffleboardTab& GetTab(wpi::StringRef title) override;
+  frc::ShuffleboardTab& GetTab(std::string_view title) override;
 
   void Update() override;
 
@@ -29,7 +30,7 @@ class ShuffleboardInstance final : public ShuffleboardRoot {
 
   void SelectTab(int index) override;
 
-  void SelectTab(wpi::StringRef) override;
+  void SelectTab(std::string_view) override;
 
  private:
   struct Impl;

wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardRoot.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -25,7 +25,7 @@ class ShuffleboardRoot {
    * @param title the title of the tab
    * @return the tab with the given title
    */
-  virtual ShuffleboardTab& GetTab(wpi::StringRef title) = 0;
+  virtual ShuffleboardTab& GetTab(std::string_view title) = 0;
 
   /**
    * Updates all tabs.
@@ -57,7 +57,7 @@ class ShuffleboardRoot {
    *
    * @param title the title of the tab to select
    */
-  virtual void SelectTab(wpi::StringRef title) = 0;
+  virtual void SelectTab(std::string_view title) = 0;
 };
 
 }  // namespace frc

wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardTab.h

@@ -5,9 +5,9 @@
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
-#include <wpi/StringRef.h>
 
 #include "frc/shuffleboard/ShuffleboardContainer.h"
 
@@ -24,7 +24,7 @@ class ShuffleboardRoot;
  */
 class ShuffleboardTab final : public ShuffleboardContainer {
  public:
-  ShuffleboardTab(ShuffleboardRoot& root, wpi::StringRef title);
+  ShuffleboardTab(ShuffleboardRoot& root, std::string_view title);
 
   ShuffleboardRoot& GetRoot();
 

wpilibc/src/main/native/include/frc/shuffleboard/WidgetType.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -25,7 +25,7 @@ class WidgetType {
    * Gets the string type of the widget as defined by that widget in
    * Shuffleboard.
    */
-  wpi::StringRef GetWidgetName() const;
+  std::string_view GetWidgetName() const;
 
  private:
   const char* m_widgetName;