Adding text editor functionality to text viewer. #868

nevumx · 2024-06-28T04:06:28Z

Pursuant to my feature request #861, I am pleased to present my proposal PR for adding text editor functionality to the existing text viewer by repurposing the existing keyboard that is used for file renames.

Features:

UTF-8 display and typing support
Support for both LF and CRLF line endings, not CR line endings
PGUP/PGDN/HOME/END-style cursor functionality
Full wordwrapped/non-wordwrapped text support
Now allowing Text Viewing/Editing of empty files to create a file from scratch
Works with viewing/editing existing script files/comment coloring
EDIT: Added full clipboard functionality with select/cut/copy/paste features!

Screenshots:

Considerations:

Some functions shared by, for example, the README ToC Viewer and System information viewer has been changed.
- I tested the system information viewer with no issues
- The README viewer seems to have disappeared for some reason, so I couldn't test that... 🤔
In order to fully support editing both wordwrapped and non-wordwrapped text, there were some edge cases that resulted in some unsightly if statements around, for example, when the last line is a certain length.
I tried to get the cursor to blink first by using code like InputWait(1), but that resulted in inputs getting dropped occasionally when pressing a button between InputWait calls when the screen was being drawn.
- I also tried a multi-threaded approach, but even though the code I wrote with <threads.h> compiled, the thread would never spawn due to thrd_error... I am guessing threads are out of scope for this project, since I don't see them anywhere else, definitely open to other suggestions on this...
I renamed the "Textviewer" to "Text Editor," which might look kind of odd next to "Hexeditor;" but "Texteditor" seemed weird too, so I am open to suggestions here too...
Some hardware buttons used on the rename prompt as keyboard hotkeys are different than in the text editor.
- For example, "R" doesn't switch between capslock states, instead it is used to move the cursor further, like with the text viewer.
- ~~Instead "Y" switches between capslock states, because I don't see a purpose for a hardware button to insert a space into the text...~~ EDIT: I am using "Y" for the new clipboard cut/copy/paste feature.
- "A" Adds a newline char instead of submitting.

Definitely open to suggestions on this, especially as it relates to key bindings/text/etc. ALSO, please do test in any/every way you can think of; I had a reasonably robust set of test files, but it's always possible that there was an edge case I missed. And translations; not sure what can be done in that regard in this PR...

EDIT: I have added clipboard functionality. For example, if we are in this file:

And we press "L+→", we start a selection:

Where we can continue this to the end of the line with additional "L+→" or "R+→" presses:

And go downwards with "L+↓" or "R+↓":

Then we can copy that text with "Y" or cut it with "R+Y":

And paste it in again with "Y":

And paste more times with the same clipboard data:

And then we can clear the clipboard with "R+Y":

Any comments/suggestions are appreciated!

nevumx · 2024-06-28T14:28:26Z

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.


Open to "Text Editor"/"Texteditor"/"Hex Editor"/"Hexeditor" guidance here...

nevumx · 2024-06-28T14:29:53Z

arm9/source/common/swkbd.h

@@ -53,9 +65,9 @@ enum {
    KEY_ALPHA, ' ', KEY_BKSPC

 #define SWKBD_KEYS_NUMPAD \
-    '7', '8', '9', 'F', 'E', \


I changed the arrangement of these to be more consistent with e.g. calculators.

nevumx · 2024-06-28T14:30:12Z

arm9/source/common/swkbd.h

 #define SWKBD_LAYOUT_SPECIAL \
    6, 0, \
    6, 0, \
    6, 0, \
    6, 0, \
-    3, 32, 46, 32, 0, \


This was bothering me as well.

nevumx · 2024-06-28T14:31:23Z

arm9/source/common/swkbd.h

@@ -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);


This is exposed to prevent rebuilds between keypresses in the MemTextViewer function.

A lot of these Github comments should probably be code comments instead

@BlueRaja done. I went through and added code comments where I felt they were relevant. If you have any other concerns, please let me know. 😁

nevumx · 2024-06-28T14:36:47Z

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;


Allowing for editing of empty files.

nevumx · 2024-06-28T14:37:11Z

arm9/source/godmode.c

@@ -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);


This is necessary, I assume, to recalculate file sizes?

nevumx · 2024-06-28T14:39:05Z

arm9/source/utils/scripting.c

@@ -205,6 +207,10 @@ static const Gm9ScriptCmd cmd_list[] = {
    { CMD_ID_BKPT    , "bkpt"    , 0, 0 }
 };

+// off-screen string indicators


Pulled these out so that the cursor-following code has access to them.

nevumx · 2024-06-28T14:40:57Z

arm9/source/utils/scripting.c

@@ -259,86 +265,125 @@ static inline u32 hexntostr(const u8* hex, char* str, u32 len) {
    return len;
 }

-static inline u32 line_len(const char* text, u32 len, u32 ww, const char* line, char** eol) {
-    u32 last = ((text + len) - line);
+static inline bool is_crlf(const char* str) {


Majority rule seems to make the most sense here... We could do a hotkey to switch newline types on the keyboard, and display the current newline type status on the keyboard screen too, let me know if you think that's a good idea.

nevumx · 2024-06-28T14:41:30Z

arm9/source/utils/scripting.c

+    return chr[0] == '\n' || (chr[0] == '\r' && chr[1] == '\n');
+}
+
+static inline u32 bytes_in_chars_u32(const char* str, u32 nchars) {


These are for slightly saner multibyte character support.

nevumx · 2024-06-28T14:43:27Z

arm9/source/utils/scripting.c

+    return chars;
+}
+
+static inline u32 line_len_chars(const char* text, u32 len, u32 ww, const char* line, const char** eol) {


I made these a bit more simplified while supporting multibyte chars, but as a result, their behavior has changed slightly. I changed invocations accordingly where necessary.

nevumx · 2024-06-28T14:44:58Z

arm9/source/utils/scripting.c

        return l0;
    }
 }

+static inline const char* line_start(const char* text, u32 len, u32 ww, const char* ptr) {


For example, this can be used now instead of line_seek(..., 0);

nevumx · 2024-06-28T14:45:23Z

arm9/source/utils/scripting.c

@@ -1614,7 +1659,7 @@ bool run_line(const char* line_start, const char* line_end, u32* flags, char* er

 // checks for illegal ASCII symbols
 bool ValidateText(const char* text, u32 len) {
-    if (!len) return false;


Allow editing empty files.

nevumx · 2024-06-28T14:45:51Z

arm9/source/utils/scripting.c


    // display text on screen
-    char txtstr[TV_LLEN_DISP + 1];
-    char* ptr = line0;
+    char txtstr[TV_LLEN_DISP * MAX_CHAR_SIZE + 1];


Add UTF-8 char max size.

nevumx · 2024-06-28T14:46:11Z

arm9/source/utils/scripting.c

-        if (ncpy > TV_LLEN_DISP) ncpy = TV_LLEN_DISP;
-        bool al = !ww && off_disp && (ptr != ptr_next);
-        bool ar = !ww && (llen > off_disp + TV_LLEN_DISP);
+        int off_disp_bytes = bytes_in_chars_int(ptr, off_disp_chars);


Multibyte support.

nevumx · 2024-06-28T14:47:01Z

arm9/source/utils/scripting.c


        // draw line number & text
        DrawString(TOP_SCREEN, txtstr, x_txt, y, color_text, COLOR_STD_BG);
        if (TV_LNOS > 0) { // line number
-            if (ptr != ptr_next)
-                DrawStringF(TOP_SCREEN, x_lno, y, ((ptr == text) || (*(ptr-1) == '\n')) ? COLOR_TVOFFS : COLOR_TVOFFSL, COLOR_STD_BG, "%0*lu", TV_LNOS, nln);
+            bool prev_ww_line_full = ww && ww == chars_between_pointers(line_seek_chars(text, len, ww, ptr, -1), ptr);


Unfortunate edge case to draw line number when the '\0' is word-wrapped onto its own line...

nevumx · 2024-06-28T14:48:08Z

arm9/source/utils/scripting.c

+            u32 cursor_line_offset_chars = chars_between_pointers(ptr + off_disp_bytes, cursor);
+            if (cursor >= ptr + off_disp_bytes && cursor <= ptr + off_disp_bytes + ncpy_bytes && cursor_line_offset_chars < TV_LLEN_DISP
+                    && (cursor != ptr + off_disp_bytes + ncpy_bytes || is_newline(cursor) || cursor == text + len)) {
+                DrawRectangle(TOP_SCREEN, x_txt + cursor_line_offset_chars * FONT_WIDTH_EXT, y, FONT_WIDTH_EXT, 1, COLOR_RED);


Without a blinking line, a hollow red rect is the next best cursor I could think of. These coords are picked so that they are drawn over by text.

nevumx · 2024-06-28T14:48:48Z

arm9/source/utils/scripting.c

+            if (cursor >= ptr + off_disp_bytes && cursor <= ptr + off_disp_bytes + ncpy_bytes && cursor_line_offset_chars < TV_LLEN_DISP
+                    && (cursor != ptr + off_disp_bytes + ncpy_bytes || is_newline(cursor) || cursor == text + len)) {
+                DrawRectangle(TOP_SCREEN, x_txt + cursor_line_offset_chars * FONT_WIDTH_EXT, y, FONT_WIDTH_EXT, 1, COLOR_RED);
+                DrawRectangle(TOP_SCREEN, x_txt + (cursor_line_offset_chars + 1) * FONT_WIDTH_EXT - ((cursor_line_offset_chars == TV_LLEN_DISP - 1) ? 1 : 0), y, 1, FONT_HEIGHT_EXT, COLOR_RED);


Small edge case to squish the cursor box at the end of the line/screen.

nevumx · 2024-06-28T14:49:54Z

arm9/source/utils/scripting.c

+            while (cursor && line0_next < line_seek_chars(text, len, ww, GetNextChar(cursor), -TV_NLIN_DISP)) line0_next = line_seek_chars(text, len, ww, line0_next, 1);
+        }
+
+        // find last allowed lines (ww and nonww)


These checks have to be performed every iteration now.

nevumx · 2024-06-28T14:50:56Z

arm9/source/utils/scripting.c

+        if (save_path) {
+            bool diffs = false;
+            if (len != text_cpy_len) diffs = true;
+            else for (u32 i = 0; i < len; ++i) if (text[i] != text_cpy[i]) { diffs = true; break; }


This could be slow for large files, but I took it form the hex editor; open to suggestions here...

nevumx · 2024-06-28T14:52:42Z

Not exactly sure who to tag here... @Wolfvak / @d0k3 ? Anyone else?

nevumx · 2024-06-28T16:48:12Z

arm9/source/utils/scripting.c

@@ -1846,18 +2074,20 @@ bool MemToCViewer(const char* text, u32 len, const char* title) {
 bool FileTextViewer(const char* path, bool as_script) {
    // load text file (completely into memory)
    // text file needs to fit inside the STD_BUFFER_SIZE
-    u32 flen, len;
+    size_t fileSize = FileGetSize(path);
+    if (fileSize >= STD_BUFFER_SIZE) {


Max file size check. I tested with a much lower number as well to make sure that the editor would not allow characters to be typed beyond the max file size.

Trickiy · 2024-06-29T07:11:32Z

Could the hex editing functionality be added to the hex viewer as well?

nevumx · 2024-06-29T21:22:52Z

Could the hex editing functionality be added to the hex viewer as well?

The hex viewer has had edit functionality since 2016: 88a62d8

nevumx · 2024-07-04T19:30:17Z

FYI @d0k3 / @Wolfvak I have added clipboard select/cut/copy/paste support as well. The description has been updated!

nevumx · 2024-08-09T21:20:48Z

@d0k3 / @Wolfvak / @BlueRaja, any more thoughts on this PR? I think text editing would be a nice feature to have, for example, for editing config files directly in GM9 without the need for more software.

nevumx · 2024-12-11T14:48:04Z

@d0k3 / @Wolfvak / @BlueRaja Bumping this

nevumx commented Jun 28, 2024

View reviewed changes

nevumx mentioned this pull request Jun 28, 2024

[FEATURE REQUEST] Text Editor #861

Closed

nevumx commented Jun 28, 2024

View reviewed changes

Adding text editor functionality to text viewer.

ab681aa

nevumx force-pushed the text-editor branch from f1ae9f7 to ab681aa Compare June 30, 2024 18:39

Adding clipboard select/cut/copy/paste support.

d6fe058

Adding code comments from github comments as per suggestion.

614c7c4

nevumx force-pushed the text-editor branch from 2210727 to 614c7c4 Compare July 9, 2024 03:22

nevumx requested a review from BlueRaja July 9, 2024 14:46

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Adding text editor functionality to text viewer. #868

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Adding text editor functionality to text viewer. #868

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