From 3618d906e681d45149cd7fe148ff3a185fd9d7a0 Mon Sep 17 00:00:00 2001
From: Krzosa Karol <krzosa@proton.me>
Date: Sat, 24 Jan 2026 18:14:38 +0100
Subject: [PATCH] Begin WordComplete

---
 src/basic/math_int.cpp                   |  4 ++
 src/text_editor/plugin_word_complete.cpp | 78 ++++++++++++++++++++++++
 src/text_editor/text_editor.cpp          |  2 +
 src/text_editor/view.cpp                 |  9 ++-
 4 files changed, 91 insertions(+), 2 deletions(-)
 create mode 100644 src/text_editor/plugin_word_complete.cpp

diff --git a/src/basic/math_int.cpp b/src/basic/math_int.cpp
index c79074d..dcb95d7 100644
--- a/src/basic/math_int.cpp
+++ b/src/basic/math_int.cpp
@@ -142,4 +142,8 @@ Int SafeDivide(Int a, Int b) {
 bool AreOverlapping(Vec2I point, Rect2I rec) {
     bool result = (point.x >= rec.min.x) && (point.x < rec.max.x) && (point.y >= rec.min.y) && (point.y < rec.max.y);
     return result;
+}
+
+Int Absolute(Int value) {
+    return llabs(value);
 }
\ No newline at end of file
diff --git a/src/text_editor/plugin_word_complete.cpp b/src/text_editor/plugin_word_complete.cpp
new file mode 100644
index 0000000..8ded20d
--- /dev/null
+++ b/src/text_editor/plugin_word_complete.cpp
@@ -0,0 +1,78 @@
+struct Lexer2 {
+    char16_t *at;
+};
+
+Lexer2 BeginLexing(String16 data) {
+    Lexer2 result = {data.data};
+    return result;
+}
+
+String16 Next(Lexer2 *lexer) {
+    while (lexer->at[0] != 0 && !IsAlphanumeric(lexer->at[0])) {
+        lexer->at += 1;
+    }
+    String16 result = {lexer->at, 0};
+    while (IsAlphanumeric(lexer->at[0])) {
+        lexer->at += 1;
+        result.len += 1;
+    }
+    return result;
+}
+
+struct WordCompleteS {
+    String16 string;
+    Int distance;
+};
+
+bool Contains(Array<WordCompleteS> *arr, String16 string) {
+    For (*arr) {
+        if (it.string == string) return true;
+    }
+    return false;
+}
+
+inline bool MergeSortCompare(WordCompleteS *EntryA, WordCompleteS *EntryB) {
+    bool result = EntryA->distance > EntryB->distance;
+    return result;
+}
+
+void CMD_WordComplete() {
+    // @todo: handle multiple carets
+    // @todo: indent when shift otherwise wordcomplte
+    // @todo: loop through buffers
+    // @todo: iterate by pressing 'tab' continously
+    Scratch scratch;
+    BSet active = GetBSet(ActiveWindowID);
+    Caret caret = active.view->carets[0];
+    Range range = caret.range;
+    if (GetSize(range) != 0) {
+        return;
+    }
+    range.min = GetWordStart(active.buffer, range.min);
+    String16 prefix = GetString(active.buffer, range);
+
+    String16 string = GetString(active.buffer);
+
+    Array<WordCompleteS> idents = {scratch};
+    Lexer2 lexer = BeginLexing(string.data);
+    for (int i = 0;; i += 1) {
+        String16 token = Next(&lexer);
+        if (token.len <= 0) break;
+        if (StartsWith(token, prefix) && token != prefix && !Contains(&idents, token)) {
+            Int pos = token.data - active.buffer->str;
+            Int distance = Absolute(range.min - pos);
+            Add(&idents, {token, distance});
+        }
+    }
+
+    if (idents.len > 1) {
+        Array<WordCompleteS> temp = TightCopy(scratch, idents);
+        MergeSort(idents.len, idents.data, temp.data);
+    }
+    if (idents.len > 0) {
+        String16 ident = idents[0].string;
+        ident = Skip(ident, prefix.len);
+        ident = Copy16(scratch, ident);
+        Replace(active.view, ident);
+    }
+} RegisterCommand(CMD_WordComplete, "ctrl-b", "Completes the current word");
\ No newline at end of file
diff --git a/src/text_editor/text_editor.cpp b/src/text_editor/text_editor.cpp
index 5b2f973..57273fb 100644
--- a/src/text_editor/text_editor.cpp
+++ b/src/text_editor/text_editor.cpp
@@ -36,6 +36,7 @@
 #define PLUGIN_LOAD_VCVARS OS_WINDOWS
 #define PLUGIN_REMEDYBG OS_WINDOWS
 #define PLUGIN_FILE_COMMANDS 1
+#define PLUGIN_WORD_COMPLETE 1
 
 #include "plugin_directory_navigation.h"
 #include "plugin_search_window.h"
@@ -74,6 +75,7 @@
 #include "plugin_remedybg.cpp"
 #include "plugin_profiler.cpp"
 #include "plugin_file_commands.cpp"
+#include "plugin_word_complete.cpp"
 
 #if OS_WASM
 EM_JS(void, JS_SetMouseCursor, (const char *cursor_str), {
diff --git a/src/text_editor/view.cpp b/src/text_editor/view.cpp
index 8b3ce5c..d0b4b08 100644
--- a/src/text_editor/view.cpp
+++ b/src/text_editor/view.cpp
@@ -604,8 +604,13 @@ void IndentSelectedLines(View *view, bool shift = false) {
     for (Int i = 0; i < saved_xy.len; i += 1) {
         Caret  &caret  = view->carets[i];
         XYPair &xypair = saved_xy[i];
-        xypair.front.x += IndentSize;
-        xypair.back.x += IndentSize;
+        if (!shift) {
+            xypair.front.x += IndentSize;
+            xypair.back.x += IndentSize;
+        } else {
+            xypair.front.x -= IndentSize;
+            xypair.back.x -= IndentSize;
+        }
         Int front = XYToPos(buffer, xypair.front);
         Int back  = XYToPos(buffer, xypair.back);
         caret = MakeCaret(front, back);