From d76fb30c7f8e073dd17180752dbd56dfa62511d3 Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Fri, 16 Apr 2021 16:25:03 -0400
Subject: command history for :shell

---
 command.c |  4 ++++
 main.c    |  5 +++++
 menu.c    | 37 ++++++++++++++++++++++++++++++++++++-
 ted.h     |  2 ++
 4 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/command.c b/command.c
index c28bce5..b706b2d 100644
--- a/command.c
+++ b/command.c
@@ -50,10 +50,14 @@ void command_execute(Ted *ted, Command c, i64 argument) {
 		break;
 	case CMD_UP:
 		if (ted->selector_open) selector_up(ted, ted->selector_open, argument);
+		else if (ted->menu == MENU_SHELL && buffer == &ted->line_buffer)
+			menu_shell_up(ted);
 		else if (buffer) buffer_cursor_move_up(buffer, argument);
 		break;
 	case CMD_DOWN:
 		if (ted->selector_open) selector_down(ted, ted->selector_open, argument);
+		else if (ted->menu == MENU_SHELL && buffer == &ted->line_buffer)
+			menu_shell_down(ted);
 		else if (buffer) buffer_cursor_move_down(buffer, argument);
 		break;
 	case CMD_SELECT_LEFT:
diff --git a/main.c b/main.c
index ff118cc..3a1b686 100644
--- a/main.c
+++ b/main.c
@@ -951,6 +951,11 @@ int main(int argc, char **argv) {
 	}
 
 	session_write(ted);
+	
+	arr_foreach_ptr(ted->shell_history, char *, cmd) {
+		free(*cmd);
+	}
+	arr_free(ted->shell_history);
 
 	SDL_FreeCursor(ted->cursor_arrow);
 	SDL_FreeCursor(ted->cursor_ibeam);
diff --git a/menu.c b/menu.c
index aff805a..d363b37 100644
--- a/menu.c
+++ b/menu.c
@@ -85,6 +85,7 @@ static void menu_open(Ted *ted, Menu menu) {
 	} break;
 	case MENU_SHELL:
 		ted_switch_to_buffer(ted, &ted->line_buffer);
+		ted->shell_history_pos = arr_len(ted->shell_history);
 		break;
 	}
 }
@@ -298,10 +299,12 @@ static void menu_update(Ted *ted) {
 	case MENU_SHELL:
 		if (line_buffer->line_buffer_submitted) {
 			char *command = str32_to_utf8_cstr(buffer_get_line(line_buffer, 0));
+			if (ted->shell_history_pos == arr_len(ted->shell_history) || line_buffer->modified) {
+				arr_add(ted->shell_history, command);
+			}
 			menu_close(ted);
 			strbuf_cpy(ted->build_dir, ted->cwd);
 			build_start_with_command(ted, command);
-			free(command);
 		}
 		break;
 	}
@@ -442,3 +445,35 @@ static void menu_render(Ted *ted) {
 	} break;
 	}
 }
+
+// move to next/previous command
+static void menu_shell_move(Ted *ted, int direction) {
+	TextBuffer *line_buffer = &ted->line_buffer;
+	if (line_buffer->modified) {
+		// don't do it if the command has been edited
+		return;
+	}
+	i64 pos = ted->shell_history_pos;
+	pos += direction;
+	if (pos >= 0 && pos <= arr_len(ted->shell_history)) {
+		ted->shell_history_pos = (u32)pos;
+		buffer_clear(line_buffer);
+		if (pos == arr_len(ted->shell_history)) {
+			// bottom of history; just clear line buffer
+		} else {
+			line_buffer->store_undo_events = false;
+			buffer_insert_utf8_at_cursor(line_buffer, ted->shell_history[pos]);
+			line_buffer->store_undo_events = true;
+			line_buffer->modified = false;
+		}
+		// line_buffer->x/y1/2 are wrong (all 0), because of buffer_clear
+		line_buffer->center_cursor_next_frame = true;
+	}
+}
+
+static void menu_shell_up(Ted *ted) {
+	menu_shell_move(ted, -1);
+}
+static void menu_shell_down(Ted *ted) {
+	menu_shell_move(ted, +1);
+}
diff --git a/ted.h b/ted.h
index d0632cc..5410398 100644
--- a/ted.h
+++ b/ted.h
@@ -308,6 +308,8 @@ typedef struct Ted {
 	Node *resizing_split;
 	
 	char **tag_selector_entries; // an array of all tags (see tag_selector_open)
+	char **shell_history; // dynamic array of history of commands run with :shell (UTF-8)
+	u32 shell_history_pos; // for keeping track of where we are in the shell history.
 
 	// points to a selector if any is open, otherwise NULL.
 	Selector *selector_open;
-- 
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