Adding text editor functionality to text viewer.

Author: nevumx

README.md

@@ -116,7 +116,7 @@ With the possibilites GodMode9 provides, not everything may be obvious at first
 * __Search drives and folders__: Just press R+A on the drive / folder you want to search.
 * __Compare and verify files__: Press the A button on the first file, select `Calculate SHA-256`. Do the same for the second file. If the two files are identical, you will get a message about them being identical. On the SDCARD drive (`0:`) you can also write an SHA file, so you can check for any modifications at a later point.
 * __Hexview and hexedit any file__: Press the A button on a file and select `Show in Hexeditor`. A button again enables edit mode, hold the A button and press arrow buttons to edit bytes. You will get an additional confirmation prompt to take over changes. Take note that for certain files, write permissions can't be enabled.
-* __View text files in a text viewer__: Press the A button on a file and select `Show in Textviewer` (only shows up for actual text files). You can enable wordwrapped mode via R+Y, and navigate around the file via R+X and the dpad.
+* __View/edit text files in a text editor__: Press the A button on a file and select `Show in Text Editor` (only shows up for actual text files). You can enable wordwrapped mode via R+Y, and navigate around the file via R+X and the dpad.
 * __Chainload FIRM payloads__: Press the A button on a FIRM file, select `FIRM options` -> `Boot FIRM`. Keep in mind you should not run FIRMs from dubious sources and that the write permissions system is no longer in place after booting a payload.
 * __Chainload FIRM payloads from a neat menu__: The `payloads` menu is found inside the HOME button menu. It provides any FIRM found in `0:/gm9/payloads` for quick chainloading.
 * __Inject a file to another file__: Put exactly one file (the file to be injected from) into the clipboard (via the Y button). Press A on the file to be injected to. There will be an option to inject the first file into it.
@@ -203,6 +203,7 @@ This tool would not have been possible without the help of numerous people. Than
 * **Lilith Valentine** for testing and helpful advice
 * **Project Nayuki** for [qrcodegen](https://github.com/nayuki/QR-Code-generator)
 * **Amazingmax fonts** for the Amazdoom font
+* **nevumx** for turning the text viewer into a text editor with UTF-8 and LF/CRLF support
 * The fine folks on **the official GodMode9 IRC channel and Discord server**
 * The fine folks on **freenode #Cakey**
 * All **[3dbrew.org](https://www.3dbrew.org/wiki/Main_Page) editors**

arm9/source/common/swkbd.c

@@ -3,7 +3,6 @@
 #include "language.h"
 #include "swkbd.h"
 #include "timer.h"
-#include "hid.h"
 #include "utf.h"
 
 
@@ -12,7 +11,7 @@ static inline char to_uppercase(char c) {
     return c;
 }
 
-static bool BuildKeyboard(TouchBox* swkbd, const char* keys, const u8* layout) {
+bool BuildKeyboard(TouchBox* swkbd, const char* keys, const u8* layout, bool multi_line) {
     // count # of rows
     u32 n_rows = 0;
     for (u32 i = 0;; i++) {
@@ -26,16 +25,18 @@ static bool BuildKeyboard(TouchBox* swkbd, const char* keys, const u8* layout) {
     u32 height = (n_rows) ? (n_rows * SWKBD_STDKEY_HEIGHT) + ((n_rows-1) * SWKDB_KEY_SPACING) : 0;
     u32 p_y = SCREEN_HEIGHT - height - SWKBD_STDKEY_HEIGHT - SWKDB_KEY_SPACING;
 
-    // set up the textbox
-    TouchBox* txtbox = swkbd;
-    txtbox->x = (SCREEN_WIDTH_BOT - SWKBD_TEXTBOX_WIDTH) / 2;
-    txtbox->y = p_y - 30;
-    txtbox->w = SWKBD_TEXTBOX_WIDTH;
-    txtbox->h = 30;
-    txtbox->id = KEY_TXTBOX;
-
     // set button positions
-    TouchBox* tb = swkbd + 1;
+    TouchBox* tb = swkbd;
+    if (!multi_line) {
+        // set up the textbox
+        TouchBox* txtbox = tb++;
+        txtbox->x = (SCREEN_WIDTH_BOT - SWKBD_TEXTBOX_WIDTH) / 2;
+        txtbox->y = p_y - 30;
+        txtbox->w = SWKBD_TEXTBOX_WIDTH;
+        txtbox->h = 30;
+        txtbox->id = KEY_TXTBOX;
+    }
+
     for (u32 l = 0, k = 0; layout[l] != 0; ) {
         // calculate width of current row
         u32 n_keys = layout[l++];
@@ -70,8 +71,9 @@ static bool BuildKeyboard(TouchBox* swkbd, const char* keys, const u8* layout) {
     return true;
 }
 
-static void DrawKey(const TouchBox* key, const bool pressed, const u32 uppercase) {
+static void DrawKey(const TouchBox* key, const bool pressed, const u32 uppercase, const bool multi_line) {
     const char* keystrs[] = { SWKBD_KEYSTR };
+    const char* ml_keystrs[] = { SWKBD_ML_KEYSTR };
     const u32 color = (pressed) ? COLOR_SWKBD_PRESSED :
         (key->id == KEY_ENTER) ? COLOR_SWKBD_ENTER :
         ((key->id == KEY_CAPS) && (uppercase > 1)) ? COLOR_SWKBD_CAPS :
@@ -81,7 +83,7 @@ static void DrawKey(const TouchBox* key, const bool pressed, const u32 uppercase
     if (key->id == KEY_TXTBOX) return;
 
     char keystr[16];
-    if (key->id >= 0x80) snprintf(keystr, sizeof(keystr), "%s", keystrs[key->id - 0x80]);
+    if (key->id >= 0x80) snprintf(keystr, sizeof(keystr), "%s", (multi_line ? ml_keystrs : keystrs)[key->id - 0x80]);
     else {
         keystr[0] = (uppercase) ? to_uppercase(key->id) : key->id;
         keystr[1] = 0;
@@ -111,12 +113,12 @@ static void DrawKeyBoardBox(TouchBox* swkbd, u32 color) {
     DrawRectangle(BOT_SCREEN, x0-1, y0-1, x1-x0+2, y1-y0+2, color);
 }
 
-static void DrawKeyBoard(TouchBox* swkbd, const u32 uppercase) {
+static void DrawKeyBoard(TouchBox* swkbd, const u32 uppercase, const bool multi_line) {
     // we need to make sure to skip the textbox here(first entry)
 
     // draw keyboard
-    for (TouchBox* tb = swkbd + 1; tb->id != 0; tb++) {
-        DrawKey(tb, false, uppercase);
+    for (TouchBox* tb = swkbd + (multi_line ? 0 : 1); tb->id != 0; tb++) {
+        DrawKey(tb, false, uppercase, multi_line);
     }
 }
 
@@ -209,32 +211,36 @@ static void MoveTextBoxCursor(const TouchBox* txtbox, const char* inputstr, cons
     }
 }
 
-static char KeyboardWait(TouchBox* swkbd, bool uppercase) {
+static char KeyboardWait(TouchBox* swkbd, bool uppercase, const bool multi_line) {
     u32 id = 0;
     u16 x, y;
 
     // wait for touch input (handle key input, too)
     while (true) {
         u32 pressed = InputWait(0);
-        if (pressed & BUTTON_B) return KEY_ESCAPE;
+        if (multi_line && pressed & TIMEOUT_HID) return 0;
+        else if (pressed & BUTTON_B) return KEY_ESCAPE;
         else if (pressed & BUTTON_A) return KEY_ENTER;
         else if (pressed & BUTTON_X) return KEY_BKSPC;
-        else if (pressed & BUTTON_Y) return KEY_INSERT;
-        else if (pressed & BUTTON_R1) return KEY_CAPS;
+        else if (pressed & BUTTON_Y) return multi_line ? KEY_CAPS : KEY_INSERT;
+        else if (!multi_line && pressed & BUTTON_R1) return KEY_CAPS;
         else if (pressed & BUTTON_RIGHT) return KEY_RIGHT;
         else if (pressed & BUTTON_LEFT) return KEY_LEFT;
-        else if (pressed & BUTTON_SELECT) return KEY_SWITCH;
+        else if (multi_line && pressed & BUTTON_UP) return KEY_UP;
+        else if (multi_line && pressed & BUTTON_DOWN) return KEY_DOWN;
+        else if (!multi_line && pressed & BUTTON_SELECT) return KEY_SWITCH;
         else if (pressed & BUTTON_TOUCH) break;
+        else if (multi_line && pressed & BUTTON_ANY) return KEY_DUMMY;
     }
 
     // process touch input
     while(HID_ReadTouchState(&x, &y)) {
         const TouchBox* tb = TouchBoxGet(&id, x, y, swkbd, 0);
         if (tb) {
             if (id == KEY_TXTBOX) break; // immediately break on textbox
-            DrawKey(tb, true, uppercase);
+            DrawKey(tb, true, uppercase, multi_line);
             while(HID_ReadTouchState(&x, &y) && (tb == TouchBoxGet(NULL, x, y, swkbd, 0)));
-            DrawKey(tb, false, uppercase);
+            DrawKey(tb, false, uppercase, multi_line);
         }
     }
 
@@ -261,9 +267,9 @@ bool ShowKeyboard(char* inputstr, const u32 max_size, const char *format, ...) {
     }
 
     // generate keyboards
-    if (!BuildKeyboard(swkbd_alphabet, keys_alphabet, layout_alphabet)) return false;
-    if (!BuildKeyboard(swkbd_special, keys_special, layout_special)) return false;
-    if (!BuildKeyboard(swkbd_numpad, keys_numpad, layout_numpad)) return false;
+    if (!BuildKeyboard(swkbd_alphabet, keys_alphabet, layout_alphabet, false)) return false;
+    if (!BuildKeyboard(swkbd_special, keys_special, layout_special, false)) return false;
+    if (!BuildKeyboard(swkbd_numpad, keys_numpad, layout_numpad, false)) return false;
 
     // (instructional) text
     char str[512]; // arbitrary limit, should be more than enough
@@ -292,19 +298,19 @@ bool ShowKeyboard(char* inputstr, const u32 max_size, const char *format, ...) {
         // draw keyboard if required
         if (swkbd != swkbd_prev) {
             DrawKeyBoardBox(swkbd, COLOR_SWKBD_BOX);
-            DrawKeyBoard(swkbd, uppercase);
+            DrawKeyBoard(swkbd, uppercase, false);
             DrawTextBox(textbox, inputstr, cursor, &scroll);
             swkbd_prev = swkbd;
         }
 
         // handle user input
-        char key = KeyboardWait(swkbd, uppercase);
+        char key = KeyboardWait(swkbd, uppercase, false);
         if (key == KEY_INSERT) key = ' '; // impromptu replacement
         if (key == KEY_TXTBOX) {
             MoveTextBoxCursor(textbox, inputstr, max_size, &cursor, &scroll);
         } else if (key == KEY_CAPS) {
             uppercase = (uppercase + 1) % 3;
-            DrawKeyBoard(swkbd, uppercase);
+            DrawKeyBoard(swkbd, uppercase, false);
             continue;
         } else if (key == KEY_ENTER) {
             ret = true;
@@ -375,7 +381,7 @@ bool ShowKeyboard(char* inputstr, const u32 max_size, const char *format, ...) {
             }
             if (uppercase == 1) {
                 uppercase = 0;
-                DrawKeyBoard(swkbd, uppercase);
+                DrawKeyBoard(swkbd, uppercase, false);
             }
         }
 
@@ -385,4 +391,38 @@ bool ShowKeyboard(char* inputstr, const u32 max_size, const char *format, ...) {
 
     ClearScreen(BOT_SCREEN, COLOR_STD_BG);
     return ret;
+}
+
+char ShowMultiLineKeyboard(TouchBox* swkbd_alphabet, TouchBox* swkbd_special, TouchBox* swkbd_numpad, TouchBox** swkbd, TouchBox** swkbd_prev, u32* uppercase) {
+    if (!*swkbd) {
+        u32 str_width = GetDrawStringWidth(STR_TEXTEDITOR_CONTROLS_KEYBOARD);
+        if (str_width < (24 * FONT_WIDTH_EXT)) str_width = 24 * FONT_WIDTH_EXT;
+        u32 str_x = (str_width >= SCREEN_WIDTH_BOT) ? 0 : (SCREEN_WIDTH_BOT - str_width) / 2;
+        ClearScreen(BOT_SCREEN, COLOR_STD_BG);
+        DrawStringF(BOT_SCREEN, str_x, 20, COLOR_STD_FONT, COLOR_STD_BG, "%s", STR_TEXTEDITOR_CONTROLS_KEYBOARD);
+        *swkbd = swkbd_alphabet;
+    }
+
+    // handle keyboard
+    while (true) {
+        // draw keyboard if required
+        if (*swkbd != *swkbd_prev) {
+            DrawKeyBoardBox(*swkbd, COLOR_SWKBD_BOX);
+            DrawKeyBoard(*swkbd, *uppercase, true);
+            *swkbd_prev = *swkbd;
+        }
+
+        // handle user input
+        char key = KeyboardWait(*swkbd, *uppercase, true);
+        if (key == KEY_ALPHA) {
+            *swkbd = swkbd_alphabet;
+        } else if (key == KEY_SPECIAL) {
+            *swkbd = swkbd_special;
+        } else if (key == KEY_NUMPAD) {
+            *swkbd = swkbd_numpad;
+        } else if (key == KEY_CAPS) {
+            *uppercase = (*uppercase + 1) % 3;
+            DrawKeyBoard(*swkbd, *uppercase, true);
+        } else return key;
+    }
 }

arm9/source/common/swkbd.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "common.h"
+#include "hid.h"
 #include "ui.h"
 #include "touchcal.h"
 
@@ -20,11 +21,15 @@ enum {
     KEY_ESCAPE  = 0x8A,
     KEY_SWITCH  = 0x8B,
     KEY_UNICODE = 0x8C,
+    KEY_UP      = 0x8D,
+    KEY_DOWN    = 0x8E,
     KEY_TXTBOX  = 0xFF
 };
 
 // special key strings
-#define SWKBD_KEYSTR "", "DEL", "INS", "SUBMIT", "CAPS", "#$@", "123", "ABC", "←", "→", "ESC", "SWITCH", "U+"
+#define SWKBD_KEYSTR "", "DEL", "INS", "SUBMIT", "CAPS", "#$@", "123", "ABC", "←", "→", "ESC", "SWITCH", "U+", "↑", "↓"
+// multiline special key stings
+#define SWKBD_ML_KEYSTR "", "DEL", "INS", "ENTER", "CAPS", "#$@", "123", "ABC", "←", "→", "ESC", "SWITCH", "U+", "↑", "↓"
 
 #define COLOR_SWKBD_NORMAL  COLOR_GREY
 #define COLOR_SWKBD_PRESSED COLOR_LIGHTGREY
@@ -45,6 +50,13 @@ enum {
     'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '_', '#', '!', \
     KEY_CAPS, ' ', KEY_NUMPAD, KEY_SPECIAL, KEY_LEFT, KEY_RIGHT
 
+#define SWKBD_KEYS_ML_ALPHABET \
+    '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '+', '-', KEY_BKSPC, \
+    'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '&', KEY_ENTER, \
+    'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', '(', ')', '[', ']', \
+    'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '_', '#', '!', \
+    KEY_CAPS, ' ', KEY_NUMPAD, KEY_SPECIAL, KEY_LEFT, KEY_RIGHT, KEY_UP, KEY_DOWN
+
 #define SWKBD_KEYS_SPECIAL \
     '(', ')', '{', '}', '[', ']', \
     '.', ',', '?', '!', '`', '\'', \
@@ -53,9 +65,9 @@ enum {
     KEY_ALPHA, ' ', KEY_BKSPC
 
 #define SWKBD_KEYS_NUMPAD \
-    '7', '8', '9', 'F', 'E', \
-    '4', '5', '6', 'D', 'C', \
-    '3', '2', '1', 'B', 'A', \
+    '7', '8', '9', 'E', 'F', \
+    '4', '5', '6', 'C', 'D', \
+    '1', '2', '3', 'A', 'B', \
     '0', '.', '_', KEY_LEFT, KEY_RIGHT, \
     KEY_ALPHA, KEY_UNICODE, ' ', KEY_BKSPC
 
@@ -68,12 +80,20 @@ enum {
     6, 32, 123, 32, 32, 18, 18, 0, \
     0
 
+#define SWKBD_LAYOUT_ML_ALPHABET \
+    13, 32, 0, \
+    12, 51, 0, \
+    13, 0, \
+    12, 0, \
+    8, 32, 85, 32, 32, 18, 18, 18, 18, 0, \
+    0
+
 #define SWKBD_LAYOUT_SPECIAL \
     6, 0, \
     6, 0, \
     6, 0, \
     6, 0, \
-    3, 32, 46, 32, 0, \
+    3, 32, 47, 32, 0, \
     0
 
 #define SWKBD_LAYOUT_NUMPAD \
@@ -87,3 +107,5 @@ enum {
 
 #define ShowKeyboardOrPrompt (TouchIsCalibrated() ? ShowKeyboard : ShowStringPrompt)
 bool PRINTF_ARGS(3) ShowKeyboard(char* inputstr, u32 max_size, const char *format, ...);
+bool BuildKeyboard(TouchBox* swkbd, const char* keys, const u8* layout, bool multi_line);
+char ShowMultiLineKeyboard(TouchBox* swkbd_alphabet, TouchBox* swkbd_special, TouchBox* swkbd_numpad, TouchBox** swkbd, TouchBox** swkbd_prev, u32* uppercase);

arm9/source/common/ui.c

@@ -489,22 +489,34 @@ u32 GetDrawStringHeight(const char* str) {
     return height;
 }
 
-u32 GetCharSize(const char* str) {
-    const char *start = str;
-    do {
-        str++;
-    } while ((*str & 0xC0) == 0x80);
+static inline bool IsIntermediateByte(const char* chr) {
+ return (*chr & 0xC0) == 0x80 || (chr[-1] == '\r' && chr[0] == '\n');
+}
+
+const char* GetNextChar(const char* chr) {
+    do ++chr; while (IsIntermediateByte(chr));
+    return chr;
+}
+
+const char* GetPrevChar(const char* chr) {
+    do --chr; while (IsIntermediateByte(chr));
+    return chr;
+}
 
-    return str - start;
+u32 GetCharSize(const char* str) {
+    return GetNextChar(str) - str;
 }
 
 u32 GetPrevCharSize(const char* str) {
-    const char *start = str;
-    do {
-        str--;
-    } while ((*str & 0xC0) == 0x80);
+    return str - GetPrevChar(str);
+}
+
+void IncChar(const char** chr) {
+    *chr = GetNextChar(*chr);
+}
 
-    return start - str;
+void DecChar(const char** chr) {
+    *chr = GetPrevChar(*chr);
 }
 
 u32 GetDrawStringWidth(const char* str) {

arm9/source/common/ui.h

@@ -70,6 +70,10 @@ void PRINTF_ARGS(4) DrawStringCenter(u16 *screen, u32 color, u32 bgcolor, const
 
 u32 GetCharSize(const char* str);
 u32 GetPrevCharSize(const char* str);
+const char* GetNextChar(const char* chr);
+const char* GetPrevChar(const char* chr);
+void IncChar(const char** chr);
+void DecChar(const char** chr);
 
 u32 GetDrawStringHeight(const char* str);
 u32 GetDrawStringWidth(const char* str);

arm9/source/godmode.c

@@ -1225,7 +1225,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
     int n_opt = 0;
     int special = (special_opt) ? ++n_opt : -1;
     int hexviewer = ++n_opt;
-    int textviewer = (filetype & TXT_GENERIC) ? ++n_opt : -1;
+    int textviewer = (filetype & TXT_GENERIC || FileGetSize(file_path) == 0) ? ++n_opt : -1;
     int calcsha256 = ++n_opt;
     int calcsha1 = ++n_opt;
     int calccmac = (CheckCmacPath(file_path) == 0) ? ++n_opt : -1;
@@ -1316,6 +1316,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
     }
     else if (user_select == textviewer) { // -> show in text viewer
         FileTextViewer(file_path, scriptable);
+        GetDirContents(current_dir, current_path);
         return 0;
     }
     else if (user_select == calcsha256) { // -> calculate SHA-256
@@ -2340,7 +2341,7 @@ u32 HomeMoreMenu(char* current_path) {
         char* sysinfo_txt = (char*) malloc(STD_BUFFER_SIZE);
         if (!sysinfo_txt) return 1;
         MyriaSysinfo(sysinfo_txt);
-        MemTextViewer(sysinfo_txt, strnlen(sysinfo_txt, STD_BUFFER_SIZE), 1, false);
+        MemTextViewer(sysinfo_txt, strnlen(sysinfo_txt, STD_BUFFER_SIZE), 1, false, 0, NULL);
         free(sysinfo_txt);
         return 0;
     }