Add cf command

documents/howtouse.md

@@ -60,7 +60,7 @@
 | <kbd>**Z**</kbd> <kbd>**Z**</kbd><br>Write current file and exit | <kbd>**Z**</kbd> <kbd>**Q**</kbd><br>Same as `:q!` | <kbd>**Ctrl**</kbd> <kbd>**w**</kbd> <kbd>**c**</kbd><br>Close current window | <kbd>**?**</kbd><br>`keyword` Search backwards |
 | <kbd>**/**</kbd><br>`keyword` Search forwards | <kbd>**\\**</kbd> <kbd>**r**</kbd><br>Quick Run | <kbd>**s**</kbd> OR <kbd>**c**</kbd><kbd>**u**</kbd><br> Delete current charater and enter insert mode | <kbd>**y**</kbd><kbd>**{**</kbd><br> Yank to the previous blank line |
 | <kbd>**y**</kbd><kbd>**}**</kbd><br> Yank to the next blank line | <kbd>**y**</kbd><kbd>**l**</kbd><br> Yank a character| <kbd>**X**</kbd> OR <kbd>**d**</kbd><kbd>**h**</kbd><br> Cut a character before cursor | <kbd>**g**</kbd><kbd>**a**</kbd><br> Show current character info |
-| <kbd>**t**</kbd><kbd>**x**</kbd><br> Move to the left of the next ```x``` (any character) on the current line | <kbd>**T**</kbd><kbd>**x**</kbd><br> Move to the right of the back ```x ``` (any character) on the current line | <kbd>**y**</kbd><kbd>**t**</kbd><br><kbd>**Any key**</kbd><br> Yank characters to an any character |
+| <kbd>**t**</kbd><kbd>**x**</kbd><br> Move to the left of the next ```x``` (any character) on the current line | <kbd>**T**</kbd><kbd>**x**</kbd><br> Move to the right of the back ```x ``` (any character) on the current line | <kbd>**y**</kbd><kbd>**t**</kbd><br><kbd>**Any key**</kbd><br> Yank characters to an any character | <kbd>**c**</kbd><kbd>**f**</kbd><br><kbd>**Any key**</kbd><br> Delete characters to an any character and enter insert mode |
 
 </details>
 

src/moepkg/help.nim

@@ -72,6 +72,7 @@ ciw        - Delete the current word and enter insert mode
 ci( or ci) - Delete the inside of round brackets and enter insert mode
 ci[ or ci] - Delete the inside of square brackets and enter insert mode
 ci{ or ci} - Delete the inside of curly brackets and enter insert mode
+cf any     - Delete characters to the any character and enter insert mode
 di"        - Delete the inside of double quotes
 di'        - Delete the inside of single quotes
 diw        - Delete the current word

src/moepkg/normalmode.nim

@@ -770,6 +770,35 @@ proc deleteCharactersAfterBlankInLine(status: var EditorStatus) =
     registerName,
     status.settings)
 
+# cf command
+proc deleteCharactersToCharacterAndEnterInsertMode(status: var EditorStatus,
+                                                   rune: Rune,
+                                                   registerName: string) =
+
+  if currentBufStatus.isReadonly:
+    status.commandLine.writeReadonlyModeWarning
+    return
+
+  let
+    currentColumn = currentMainWindowNode.currentColumn
+    # Get the position of a character
+    position = currentBufStatus.searchOneCharacterToEndOfLine(
+      currentMainWindowNode,
+      rune)
+
+  if position > currentColumn:
+    currentBufStatus.cmdLoop = position - currentColumn + 1
+    status.deleteCharacters
+
+    status.changeMode(Mode.insert)
+
+# cf command
+proc deleteCharactersToCharacterAndEnterInsertMode(status: var EditorStatus,
+                                                   rune: Rune) =
+
+  const registerName = ""
+  status.deleteCharactersToCharacterAndEnterInsertMode(rune, registerName)
+
 proc enterInsertModeAfterCursor(status: var EditorStatus) =
   if currentBufStatus.isReadonly:
     status.commandLine.writeReadonlyModeWarning
@@ -895,6 +924,10 @@ proc addRegister(status: var EditorStatus, command, registerName: string) =
     status.changeInnerCommand(command[2].toRune, registerName)
   elif command.len == 3 and command[0 .. 1] == "yt":
     status.yankCharactersToCharacter(command[2].toRune, registerName)
+  elif command.len == 3 and command[0 .. 1] == "cf":
+    status.deleteCharactersToCharacterAndEnterInsertMode(
+      command[2].toRune,
+      registerName)
   else:
     discard
 
@@ -954,7 +987,8 @@ proc registerCommand(status: var EditorStatus, command: seq[Rune]) =
        cmd == "dh" or
        cmd == "cl" or cmd == "s" or
        (cmd.len == 3 and cmd[0 .. 1] == "ci") or
-       (cmd.len == 3 and cmd[0 .. 1] == "yt"):
+       (cmd.len == 3 and cmd[0 .. 1] == "yt") or
+       (cmd.len == 3 and cmd[0 .. 1] == "cf"):
     status.addRegister(cmd, $registerName)
 
 proc pasteAfterCursor(status: var EditorStatus) {.inline.} =
@@ -1111,13 +1145,16 @@ proc normalCommand(status: var EditorStatus,
     if secondKey == ord('c'):
       status.deleteCharactersAfterBlankInLine
       status.enterInsertModeAfterCursor
-    if secondKey == ord('l'):
+    elif secondKey == ord('l'):
       status.deleteCharacterAndEnterInsertMode
     elif secondKey == ord('i'):
       let thirdKey = commands[2]
       if isParen(thirdKey) or
          thirdKey == ord('w'):
         status.changeInnerCommand(thirdKey)
+    elif secondKey == ord('f'):
+      let thirdKey = commands[2]
+      status.deleteCharactersToCharacterAndEnterInsertMode(thirdKey)
   elif key == ord('d'):
     let secondKey = commands[1]
     if secondKey == ord('d'):
@@ -1371,15 +1408,16 @@ proc isNormalModeCommand(command: seq[Rune]): InputState =
       if command.len == 1:
         result = InputState.Continue
       elif command.len == 2:
-        if command[1] == ord('i'):
+        if command[1] == ord('i') or
+           command[1] == ord('f'):
           result = InputState.Continue
         elif command[1] == ord('c') or command[1] == ('l'):
           result = InputState.Valid
       elif command.len == 3:
-        if command[1] == ord('i'):
-          if isParen(command[2]) or
-             command[2] == ord('w'):
-            result = InputState.Valid
+        if command[1] == ord('f') or
+           (command[1] == ord('i') and
+           (isParen(command[2]) or command[2] == ord('w'))):
+          result = InputState.Valid
 
     elif command[0] == ord('d'):
       if command.len == 1:

tests/tnormalmode.nim

@@ -1916,3 +1916,39 @@ suite "Normal mode: Yank characters to any character":
     check currentBufStatus.buffer[0] == buffer
 
     check status.registers.noNameRegister.buffer.len == 0
+
+suite "Normal mode: Delete characters to any characters and Enter insert mode":
+  test "Case 1: Delete characters to 'd' and enter insert mode (\"cfd\" command)":
+    var status = initEditorStatus()
+    status.addNewBuffer
+
+    const buffer = ru "abcd"
+    currentBufStatus.buffer = initGapBuffer(@[buffer])
+
+    const command = ru "cfd"
+    status.normalCommand(command, 100, 100)
+
+    check currentBufStatus.buffer.len == 1
+    check currentBufStatus.buffer[0] == ru ""
+
+    check not status.registers.noNameRegister.isLine
+    check status.registers.noNameRegister.buffer[0] == ru "abcd"
+
+    check currentBufStatus.mode == Mode.insert
+
+  test "Case 1: Do nothing (\"cfz\" command)":
+    var status = initEditorStatus()
+    status.addNewBuffer
+
+    const buffer = ru "abcd"
+    currentBufStatus.buffer = initGapBuffer(@[buffer])
+
+    const command = ru "cfz"
+    status.normalCommand(command, 100, 100)
+
+    check currentBufStatus.buffer.len == 1
+    check currentBufStatus.buffer[0] == buffer
+
+    check status.registers.noNameRegister.buffer.len == 0
+
+    check currentBufStatus.mode == Mode.normal