From 6b4d9f0cda2fa6b9cc9eb2b3d591f9afccfaf13e Mon Sep 17 00:00:00 2001
From: Patrick Cleaveliln <patrick@spacegirl.nl>
Date: Thu, 10 Jul 2025 06:24:05 +0000
Subject: [PATCH] test harness

---
 Makefile                  |   3 +
 src/core/file_buffer.odin |   2 +-
 src/main.odin             |   2 +-
 src/tests/tests.odin      | 622 ++++++++++++++++++++++++++++++++++++++
 todo.md                   |  18 +-
 5 files changed, 637 insertions(+), 10 deletions(-)
 create mode 100644 src/tests/tests.odin

diff --git a/Makefile b/Makefile
index 004a5dd..866b113 100644
--- a/Makefile
+++ b/Makefile
@@ -8,3 +8,6 @@ editor: grep src/**/*.odin
 
 grep:
 	cargo build --manifest-path "src/pkg/grep_lib/Cargo.toml"
+
+test: src/**/*.odin
+	odin test src/tests/ -all-packages -debug -out:bin/test_runner
\ No newline at end of file
diff --git a/src/core/file_buffer.odin b/src/core/file_buffer.odin
index 8900a99..4782796 100644
--- a/src/core/file_buffer.odin
+++ b/src/core/file_buffer.odin
@@ -1073,7 +1073,7 @@ insert_content :: proc(buffer: ^FileBuffer, to_be_inserted: []u8, append_to_end:
 
     if !append_to_end {
         update_file_buffer_index_from_cursor(buffer);
-        move_cursor_right(buffer, false, amt = len(to_be_inserted));
+        move_cursor_right(buffer, false, amt = len(to_be_inserted) - 1);
     }
 }
 
diff --git a/src/main.odin b/src/main.odin
index a162476..91ffc5f 100644
--- a/src/main.odin
+++ b/src/main.odin
@@ -320,7 +320,7 @@ main :: proc() {
     } else {
         buffer := core.new_virtual_file_buffer(context.allocator);
 
-        util.append_static_list(&state.panels, panels.make_file_buffer_panel(len(state.buffers)))
+        panels.open(&state, panels.make_file_buffer_panel(len(state.buffers)))
         runtime.append(&state.buffers, buffer);
     }
 
diff --git a/src/tests/tests.odin b/src/tests/tests.odin
new file mode 100644
index 0000000..c0cd4bd
--- /dev/null
+++ b/src/tests/tests.odin
@@ -0,0 +1,622 @@
+package tests
+
+import "base:runtime"
+import "core:testing"
+import "core:fmt"
+import "core:mem"
+import "core:log"
+
+import "../core"
+import "../panels"
+import "../util"
+
+new_test_editor :: proc() -> core.State {
+    state := core.State {
+        ctx = context,
+        screen_width = 640,
+        screen_height = 480,
+        source_font_width = 8,
+        source_font_height = 16,
+
+        panels = util.make_static_list(core.Panel, 128),
+
+        directory = "test_directory",
+    };
+
+    return state
+}
+
+buffer_to_string :: proc(buffer: ^core.FileBuffer) -> string {
+    if buffer == nil {
+        log.error("nil buffer")
+    }
+
+    length := 0
+    for content_slice in buffer.content_slices {
+        length += len(content_slice)
+    }
+
+    buffer_contents := make([]u8, length)
+
+    offset := 0
+    for content_slice in buffer.content_slices {
+        for c in content_slice {
+            buffer_contents[offset] = c
+            offset += 1
+        }
+    }
+
+    return string(buffer_contents)
+}
+
+ArtificialInput :: union {
+    ArtificialKey,
+    ArtificialTextInput,
+}
+
+ArtificialKey :: struct {
+    is_down: bool,
+    key: core.Key,
+}
+
+ArtificialTextInput :: struct {
+    text: string,
+}
+
+press_key :: proc(key: core.Key) -> ArtificialKey {
+    return ArtificialKey {
+        is_down = true,
+        key = key
+    }
+}
+
+release_key :: proc(key: core.Key) -> ArtificialKey {
+    return ArtificialKey {
+        is_down = false,
+        key = key
+    }
+}
+
+input_text :: proc(text: string) -> ArtificialTextInput {
+    return ArtificialTextInput {
+        text = text
+    }
+}
+
+setup_empty_buffer :: proc(state: ^core.State) {
+    buffer := core.new_virtual_file_buffer(context.allocator);
+    panels.open(state, panels.make_file_buffer_panel(len(state.buffers)))
+    runtime.append(&state.buffers, buffer);
+
+    core.reset_input_map(state)
+}
+
+run_inputs :: proc(state: ^core.State, inputs: []ArtificialInput) {
+    is_ctrl_pressed := false
+
+    for input in inputs {
+        run_editor_frame(state, input, &is_ctrl_pressed)
+    }
+}
+
+run_input_multiple :: proc(state: ^core.State, input: ArtificialInput, amount: int) {
+    is_ctrl_pressed := false
+
+    for _ in 0..<amount {
+        run_editor_frame(state, input, &is_ctrl_pressed)
+    }
+}
+
+run_text_insertion :: proc(state: ^core.State, text: string) {
+    is_ctrl_pressed := false
+
+    inputs := []ArtificialInput {
+        press_key(.I),
+        input_text(text),
+        press_key(.ESCAPE),
+    }
+
+    for input in inputs {
+        run_editor_frame(state, input, &is_ctrl_pressed)
+    }
+}
+
+expect_line_col :: proc(t: ^testing.T, cursor: core.Cursor, line, col: int) {
+    testing.expect_value(t, cursor.line, line)
+    testing.expect_value(t, cursor.col, col)
+}
+
+expect_cursor_index :: proc(t: ^testing.T, cursor: core.Cursor, slice_index, content_index: int) {
+    testing.expect_value(t, cursor.index.slice_index, slice_index)
+    testing.expect_value(t, cursor.index.content_index, content_index)
+}
+
+@(test)
+insert_from_empty_no_newlines :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    inputted_text := "Hello, world!"
+    expected_text := fmt.aprintf("%v\n", inputted_text)
+    run_text_insertion(&e, inputted_text)
+
+    expect_line_col(t, buffer.cursor, 0, 12)
+    expect_cursor_index(t, buffer.cursor, 0, 12)
+
+    contents := buffer_to_string(core.current_buffer(&e))
+    testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+}
+
+@(test)
+insert_from_empty_with_newline :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    inputted_text := "Hello, world!\nThis is a new line"
+    expected_text := fmt.aprintf("%v\n", inputted_text)
+    run_text_insertion(&e, inputted_text)
+
+    expect_line_col(t, buffer.cursor, 1, 17)
+    expect_cursor_index(t, buffer.cursor, 0, 31)
+
+    contents := buffer_to_string(core.current_buffer(&e))
+    testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+}
+
+@(test)
+insert_in_between_text :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    inputted_text := "Hello, world!"
+    expected_text := "Hello, beautiful world!\n"
+
+    run_text_insertion(&e, inputted_text)
+
+    // Move the cursor to the space in between 'Hello,' and 'world!'
+    run_input_multiple(&e, press_key(.H), 6)
+
+    run_text_insertion(&e, " beautiful")
+
+    expect_line_col(t, buffer.cursor, 0, 15)
+    expect_cursor_index(t, buffer.cursor, 1, 9)
+
+    contents := buffer_to_string(core.current_buffer(&e))
+    testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+}
+
+@(test)
+insert_before_slice_at_beginning_of_file :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    inputted_text := "Hello, world!"
+    expected_text := "Well, Hello, beautiful world!\n"
+
+    run_text_insertion(&e, inputted_text)
+
+    // Move the cursor to the space in between 'Hello,' and 'world!'
+    run_input_multiple(&e, press_key(.H), 6)
+    run_text_insertion(&e, " beautiful")
+
+    // Move to beginning of line (and hence the file)
+    run_inputs(&e, []ArtificialInput{ press_key(.G), press_key(.H)})
+    run_text_insertion(&e, "Well, ")
+
+    expect_line_col(t, buffer.cursor, 0, 5)
+    expect_cursor_index(t, buffer.cursor, 0, 5)
+
+    contents := buffer_to_string(core.current_buffer(&e))
+    testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+}
+
+@(test)
+insert_before_slice :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    inputted_text := "Hello, world!"
+    expected_text := "Hello, beautiful rich world!\n"
+
+    run_text_insertion(&e, inputted_text)
+
+    // Move the cursor to the space in between 'Hello,' and 'world!'
+    run_input_multiple(&e, press_key(.H), 6)
+    run_text_insertion(&e, " beautiful")
+
+    // Move right to the start of the slice of ' world!'
+    run_input_multiple(&e, press_key(.L), 1)
+
+    run_text_insertion(&e, " rich")
+
+    expect_line_col(t, buffer.cursor, 0, 20)
+    expect_cursor_index(t, buffer.cursor, 2, 4)
+
+    contents := buffer_to_string(core.current_buffer(&e))
+    testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+}
+
+@(test)
+delete_in_slice :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    inputted_text := "Hello, world!"
+    expected_text := "Hello, beautiful h world!\n"
+    //                ------          - ---------
+    //                      ---------- -
+    //                0     1         234
+
+    run_text_insertion(&e, inputted_text)
+
+    // Move the cursor to the space in between 'Hello,' and 'world!'
+    run_input_multiple(&e, press_key(.H), 6)
+    run_text_insertion(&e, " beautiful")
+
+    // Move right to the start of the slice of ' world!'
+    run_input_multiple(&e, press_key(.L), 1)
+    run_text_insertion(&e, " rich")
+
+    run_input_multiple(&e, press_key(.I), 1)
+    run_input_multiple(&e, press_key(.BACKSPACE), 3)
+    run_input_multiple(&e, press_key(.ESCAPE), 1)
+
+    expect_line_col(t, buffer.cursor, 0, 17)
+    expect_cursor_index(t, buffer.cursor, 3, 0)
+
+    contents := buffer_to_string(core.current_buffer(&e))
+    testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+}
+
+@(test)
+delete_across_slices :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    inputted_text := "Hello, world!"
+    expected_text := "Hello, beautiful world!\n"
+    //                ------          ---------
+    //                      ---------- 
+    //                0     1         2
+
+    run_text_insertion(&e, inputted_text)
+
+    // Move the cursor to the space in between 'Hello,' and 'world!'
+    run_input_multiple(&e, press_key(.H), 6)
+    run_text_insertion(&e, " beautiful")
+
+    // Move right to the start of the slice of ' world!'
+    run_input_multiple(&e, press_key(.L), 1)
+    run_text_insertion(&e, " rich")
+
+    run_input_multiple(&e, press_key(.I), 1)
+    run_input_multiple(&e, press_key(.BACKSPACE), 3)
+    run_input_multiple(&e, press_key(.ESCAPE), 1)
+
+    // Move right, passed the 'h' on to the space before 'world!'
+    run_input_multiple(&e, press_key(.L), 1)
+
+    // Remove the ' h', which consists of two content slices
+    run_input_multiple(&e, press_key(.I), 1)
+    run_input_multiple(&e, press_key(.BACKSPACE), 2)
+    run_input_multiple(&e, press_key(.ESCAPE), 1)
+
+    expect_line_col(t, buffer.cursor, 0, 16)
+    expect_cursor_index(t, buffer.cursor, 2, 0)
+
+    contents := buffer_to_string(core.current_buffer(&e))
+    testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+}
+
+// @(test)
+// insert_line_under_current :: proc(t: ^testing.T) {
+//     e := new_test_editor()
+//     setup_empty_buffer(&e)
+
+//     buffer := &e.buffers[0]
+
+//     inputted_text := "Hello, world!\nThis is a new line"
+//     expected_text := fmt.aprintf("%v\n", inputted_text)
+//     run_text_insertion(&e, inputted_text)
+
+//     expect_line_col(t, buffer.cursor, 1, 17)
+//     expect_cursor_index(t, buffer.cursor, 0, 31)
+
+//     contents := buffer_to_string(core.current_buffer(&e))
+//     testing.expectf(t, contents == expected_text, "got '%v', expected '%v'", contents, expected_text)
+// }
+
+@(test)
+move_left_at_beginning_of_file :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    buffer := &e.buffers[0]
+
+    run_text_insertion(&e, "01234")
+    // Move cursor from --------^
+    // to ------------------^
+    run_input_multiple(&e, press_key(.H), 4)
+
+    expect_line_col(t, buffer.cursor, 0, 0)
+    expect_cursor_index(t, buffer.cursor, 0, 0)
+
+    // Try to move before the beginning of the file
+    run_input_multiple(&e, press_key(.H), 1)
+
+    // Should stay the same
+    expect_line_col(t, buffer.cursor, 0, 0)
+    expect_cursor_index(t, buffer.cursor, 0, 0)
+}
+
+@(test)
+move_right_at_end_of_file :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    is_ctrl_pressed := false
+
+    buffer := &e.buffers[0]
+
+    run_text_insertion(&e, "01234")
+
+    expect_line_col(t, buffer.cursor, 0, 4)
+    expect_cursor_index(t, buffer.cursor, 0, 4)
+
+    // Try to move after the end of the file
+    run_input_multiple(&e, press_key(.L), 1)
+
+    // Should stay the same
+    expect_line_col(t, buffer.cursor, 0, 4)
+    expect_cursor_index(t, buffer.cursor, 0, 4)
+}
+
+@(test)
+move_to_end_of_line_from_end :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    is_ctrl_pressed := false
+
+    buffer := &e.buffers[0]
+
+    run_text_insertion(&e, "01234\n01234")
+
+    // Move up to the first line
+    run_input_multiple(&e, press_key(.K), 1)
+
+    // Move to the end of the line
+    run_inputs(&e, []ArtificialInput{ press_key(.G), press_key(.L)})
+
+    expect_line_col(t, buffer.cursor, 0, 4)
+    expect_cursor_index(t, buffer.cursor, 0, 4)
+}
+
+@(test)
+move_to_end_of_line_from_middle :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    is_ctrl_pressed := false
+
+    buffer := &e.buffers[0]
+
+    run_text_insertion(&e, "01234\n01234")
+
+    // Move up to the first line
+    run_input_multiple(&e, press_key(.K), 1)
+
+    // Move into the middle of the line
+    run_input_multiple(&e, press_key(.H), 2)
+
+    // Move to the end of the line
+    run_inputs(&e, []ArtificialInput{ press_key(.G), press_key(.L)})
+
+    expect_line_col(t, buffer.cursor, 0, 4)
+    expect_cursor_index(t, buffer.cursor, 0, 4)
+}
+
+@(test)
+move_to_beginning_of_line_from_middle :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    is_ctrl_pressed := false
+
+    buffer := &e.buffers[0]
+
+    run_text_insertion(&e, "01234\n01234")
+
+    // Move up to the first line
+    run_input_multiple(&e, press_key(.K), 1)
+
+    // Move into the middle of the line
+    run_input_multiple(&e, press_key(.H), 2)
+
+    // Move to the beginning of the line
+    run_inputs(&e, []ArtificialInput{ press_key(.G), press_key(.H)})
+
+    expect_line_col(t, buffer.cursor, 0, 0)
+    expect_cursor_index(t, buffer.cursor, 0, 0)
+}
+
+@(test)
+move_to_beginning_of_line_from_start :: proc(t: ^testing.T) {
+    e := new_test_editor()
+    setup_empty_buffer(&e)
+
+    is_ctrl_pressed := false
+
+    buffer := &e.buffers[0]
+
+    run_text_insertion(&e, "01234\n01234")
+
+    // Move up to the first line
+    run_input_multiple(&e, press_key(.K), 1)
+
+    // Move to the start of the line
+    run_input_multiple(&e, press_key(.H), 4)
+
+    // Move to the beginning of the line
+    run_inputs(&e, []ArtificialInput{ press_key(.G), press_key(.H)})
+
+    expect_line_col(t, buffer.cursor, 0, 0)
+    expect_cursor_index(t, buffer.cursor, 0, 0)
+}
+
+run_editor_frame :: proc(state: ^core.State, input: ArtificialInput, is_ctrl_pressed: ^bool) {
+    log.infof("running input: %v", input)
+
+    {
+        run_key_action := proc(state: ^core.State, control_key_pressed: bool, key: core.Key) -> bool {
+            log.info("key_action")
+
+            if state.current_input_map != nil {
+                if control_key_pressed {
+                    if action, exists := state.current_input_map.ctrl_key_actions[key]; exists {
+                        switch value in action.action {
+                            case core.EditorAction:
+                                value(state);
+                                return true;
+                            case core.InputActions:
+                                state.current_input_map = &(&state.current_input_map.ctrl_key_actions[key]).action.(core.InputActions)
+                                return true;
+                        }
+                    }
+                } else {
+                    if action, exists := state.current_input_map.key_actions[key]; exists {
+                        switch value in action.action {
+                            case core.EditorAction:
+                                value(state);
+                                return true;
+                            case core.InputActions:
+                                state.current_input_map = &(&state.current_input_map.key_actions[key]).action.(core.InputActions)
+                                return true;
+                        }
+                    }
+                }
+            } else {
+                log.info("current_input_map is null")
+            }
+
+            return false
+        }
+
+        switch state.mode {
+            case .Visual: fallthrough
+            case .Normal: {
+                log.info("it's normal/visual mode")
+
+                if key, ok := input.(ArtificialKey); ok {
+                    if key.is_down {
+                        if key.key == .LCTRL {
+                            is_ctrl_pressed^ = true;
+                        } else {
+                            run_key_action(state, is_ctrl_pressed^, key.key)
+                        }
+                    } else {
+                        if key.key == .LCTRL {
+                            is_ctrl_pressed^ = false;
+                        }
+                    }
+                }
+            }
+            case .Insert: {
+                log.info("it's insert mode")
+
+                buffer := core.current_buffer(state);
+
+                if key, ok := input.(ArtificialKey); ok {
+                    if key.is_down {
+                        // TODO: make this work properly
+                        if true || !run_key_action(state, is_ctrl_pressed^, key.key) {
+                            #partial switch key.key {
+                                case .ESCAPE: {
+                                    state.mode = .Normal;
+
+                                    core.insert_content(buffer, buffer.input_buffer[:]);
+                                    runtime.clear(&buffer.input_buffer);
+                                }
+                                case .TAB: {
+                                    // TODO: change this to insert a tab character
+                                    for _ in 0..<4 {
+                                        append(&buffer.input_buffer, ' ');
+                                    }
+                                }
+                                case .BACKSPACE: {
+                                    core.delete_content(buffer, 1);
+                                }
+                                case .ENTER: {
+                                    append(&buffer.input_buffer, '\n');
+                                }
+                            }
+                        }
+                    }
+                }
+
+                log.info("before text input")
+                if text_input, ok := input.(ArtificialTextInput); ok {
+                    log.infof("attempting to append '%v' to buffer", text_input)
+
+                    for char in text_input.text {
+                        if char < 1 {
+                            break;
+                        }
+
+                        if char == '\n' || (char >= 32 && char <= 125 && len(buffer.input_buffer) < 1024-1) {
+                            log.infof("appening '%v' to buffer", char)
+                            append(&buffer.input_buffer, u8(char));
+                        }
+                    }
+
+                    if current_panel, ok := state.current_panel.?; ok {
+                        if panel, ok := util.get(&state.panels, current_panel).?; ok && panel.on_buffer_input_proc != nil {
+                            panel.on_buffer_input_proc(state, &panel.panel_state)
+                        }
+                    }
+                }
+            }
+        }
+    }
+    
+    // TODO: share this with the main application
+    do_insert_mode :: proc(state: ^core.State, buffer: ^core.FileBuffer) {
+        key := 0;
+
+        for key > 0 {
+            if key >= 32 && key <= 125 && len(buffer.input_buffer) < 1024-1 {
+                append(&buffer.input_buffer, u8(key));
+            }
+
+            key = 0;
+        }
+    }
+
+    switch state.mode {
+        case .Normal:
+            // buffer := core.current_buffer(state);
+            // do_normal_mode(state, buffer);
+        case .Insert:
+            buffer := core.current_buffer(state);
+            do_insert_mode(state, buffer);
+        case .Visual:
+            // buffer := core.current_buffer(state);
+            // do_visual_mode(state, buffer);
+    }
+
+    runtime.free_all(context.temp_allocator);
+}
diff --git a/todo.md b/todo.md
index 7becd7e..9ec2eb3 100644
--- a/todo.md
+++ b/todo.md
@@ -2,22 +2,27 @@
 - Fix crash when cursor is over a new-line
 - Fix jumping forward a word jumping past consecutive brackets
 - Odd scrolling behavior on small screen heights
+- Closing the only panel crashes
 
 # Planned Features
+- Testing Harness
+    - [x] Replay user inputs and assert buffer contents/changes
+    - [ ] Finish writing tests for all current user actions
+- Vim-like Macro replays
+- [ ] Simple File Search (vim /)
+- [ ] Auto-indent
+- Modify input system to allow for keybinds that take input
+    - Vim's f and F movement commands
+    - Vim's r command
 - Save/Load files
     - [x] Save
     - [ ] Load when changed on disk
-- [ ] Simple File Search (vim /)
-- [ ] Auto-indent
-- Testing Harness
-    - [ ] Replay user inputs and assert buffer contents/changes
 - LSP Integration
     - [ ] Language Server Configurations
     - [ ] Diagnostics
         - [ ] In-line errors
     - [ ] Go-to Definition/
     - [ ] Find references
-- Vim-like Macro replays
 - Re-implement lost features from Plugins
     - [ ] Syntax Highlighting
         - [ ] Integrate tree-sitter
@@ -45,9 +50,6 @@
             - [ ] Change inside delimiter
 - Virtual Whitespace
     - Allow any-sized tabs
-- Modify input system to allow for keybinds that take input
-    - Vim's f and F movement commands
-    - Vim's r command
 - Command Search and Execution
     - Refactor to remove generics added specifically for plugins
     - Palette based UI?