Merge branch '8-add-tui' - tests not passing

client/PLAN.md

@@ -0,0 +1,136 @@
+# Plan: Refactor TUI into Standalone FIFO‑Client Binary
+
+## Goal
+Extract the TUI from the existing monolithic codebase into a separate `looper-client` binary that communicates with the engine **only** via the FIFO pipe (`/tmp/looper_cmd`).  
+The TUI must **not** link to any engine source files (`engine.c`, `dispatcher.c`, `carla.c`, etc.) or use their headers beyond shared type definitions (e.g., `command.h`). All state is maintained by the engine; the TUI sends commands and assumes they succeed.
+
+## Background
+- The looper engine runs as a separate JACK client and listens for commands on:
+  - FIFO pipe (`/tmp/looper_cmd`) – text‑based commands
+  - `looper:control` – MIDI note‑on events
+- The current TUI uses a local `Engine` / `AppState` / `dispatcher` that does **not** talk to the real looper. It was designed for unit testing.
+
+## Task 1 – Create a new `client/` directory structure
+- Keep existing `client/src/tui.c` and `client/src/tui.h`.
+- Remove all `#include` directives that reference engine internal headers:
+  - `engine.h`
+  - `dispatcher.h`
+  - `wav_io.h`
+  - `transport.h`
+  - `carla.h`
+- Remove any `Engine*`, `AppState`, `DispatchFn`, `Clip`, `MidiClip` usage.
+- **Keep** the `FuzzySearch` struct, `draw_rack_view()`, `handle_rack_view()`, `list_wav_files()`, `load_sample_callback`, mouse handling, etc. – they **are not removed**.  
+  However, every call to engine internals (e.g., `carla_get_available_plugins`, `dispatcher_get_state`, `g_dispatch`, `carla.h` functions) **must be replaced** with a stub that does nothing (or prints a debug message) until the engine implements the corresponding FIFO commands.  
+  This keeps the UI code compilable and preserves the structure for future implementation.
+
+## Task 2 – Implement `send_command()` and open FIFO
+- Add a function:
+
+  ```c
+  int send_command(const char *cmd_line);
+  ```
+
+  This function:
+  - Opens `/tmp/looper_cmd` with `O_WRONLY`.
+  - Writes the command string (e.g., `"record 0\n"`).
+  - Appends a newline if missing.
+  - Closes the file descriptor.
+  - Returns 0 on success, -1 on error (prints diagnostic to stderr).
+
+- The TUI should call `send_command()` for every user action that should affect the engine.
+
+## Task 3 – Map TUI keys to FIFO commands
+Replace each `g_dispatch(action)` with a direct FIFO command string.
+
+**Proposed mapping (simplified – can be refined later):**
+
+| TUI key/action                             | FIFO command                                        |
+|--------------------------------------------|-----------------------------------------------------|
+| `'t'` (trigger clip at selected cell)      | `record <channel>\n` (channel = `selected_col`)     |
+| `'d'` (reset clip)                         | `stop\n` (global stop)                              |
+| `'s'` (trigger scene – current row)        | `"scene_next\n"` (or `"scene_add\n"`? TBD)         |
+| `' '` (toggle transport play/pause)        | No corresponding FIFO command yet. Omit for now.    |
+| `'S'` (stop transport)                     | `"stop\n"`                                          |
+| `'q'` (cycle quantize)                     | No FIFO equivalent – ignore.                        |
+| `'x'` (reset transport)                    | `"stop\n"`                                          |
+| `'N'` (play next scene)                    | `"scene_next\n"`                                    |
+| `'P'` (play previous scene)                | `"scene_prev\n"`                                    |
+| `'u'` (undo)                               | No FIFO equivalent – ignore.                        |
+| `Ctrl+R` (redo)                            | Ignore.                                             |
+| `'v'`, `'V'` (visual mode)                | Keep visual selection logic but send commands only for `'d'` and `'y'` actions. |
+| `'y'` (yank)                               | Do nothing (local clipboard only).                  |
+| `'p'` (paste)                              | For each pasted cell send `"record <ch>\n"`.        |
+| `'m'` (move mode)                          | No effect on engine – local navigation.             |
+| `'z'` (zoom grid selector)                 | Local navigation only.                              |
+| `'G'` (toggle audio/MIDI grid)             | No FIFO command – ignore.                           |
+| `'-'` / `'='` (volume)                     | No FIFO command – ignore.                           |
+| `\t` (switch to rack view)                 | Remove entirely.                                    |
+| `':'` command mode                         | Keep for `:q` (quit) and `:rack` commands (the latter can be removed). |
+| Escape / `'Q'`                             | Quit the TUI (no command sent).                     |
+
+**Channel binding:**  
+- When the user moves selection to a new column, send `"bind <col>\n"` to ensure subsequent commands affect the correct channel. This can be done in the navigation switch cases.
+
+## Task 4 – Remove all references to `Engine` and `dispatcher`
+- Delete the lines:
+  - `static Engine *g_engine = NULL;`
+  - `static DispatchFn g_dispatch = NULL;`
+- Replace calls like `g_dispatch(action)` with `send_command(formatted_string)`.
+- Remove `dispatcher_get_state()` calls – the TUI will no longer query the engine state. Update `draw_cell()` to display only static info (clip index) or a fixed colour (e.g., all green). The state‑dependent colouring is not available without feedback from the engine. For now, show all cells as idle (white) or use a placeholder.
+- Remove the line `AppState state; dispatcher_get_state(&state);` inside draw functions.
+
+## Task 5 – Simplify the `tui.h` header
+- Replace the function signatures:
+
+  ```c
+  void tui_init(void);          // no Engine* argument
+  void tui_run(void);           // no Engine* argument
+  void tui_cleanup(void);
+  ```
+
+- Remove `#include "engine.h"` and `#include "dispatcher.h"`.
+- Remove the `Engine*` parameter from the init and run functions.
+
+## Task 6 – Create `client/main.c`
+- Write a simple `main()` that:
+  - Optionally opens the FIFO for writing just to check it exists.
+  - Calls `tui_init()`.
+  - Calls `tui_run()`.
+  - Calls `tui_cleanup()`.
+  - Returns 0.
+
+## Task 7 – Write `client/makefile`
+- Target `looper-client`:
+  - Compile `src/tui.c` and `src/main.c` (or `src/client.c` if split).
+  - **Do not** link to any engine `.o` files.
+  - Link only with `-lncurses` (and `-lm` if needed).
+  - Example:
+    ```makefile
+    CC ?= gcc
+    CFLAGS ?= -Wall -Wextra -g -I../engine/src
+    LDFLAGS ?= -lncurses -lm
+
+    looper-client: src/tui.c src/main.c
+    	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+    ```
+
+## Task 8 – Remove dead code and unnecessary helpers
+- Delete `utils.c` / `utils.h` if they existed only for TUI – but keep all WAV‑related, rack‑related, and fuzzy‑search code (they are now stubs).
+- Remove `clip_state_to_string()`, `transport_state_to_string()`, `quantize_mode_to_string()`, `clock_source_to_string()` – they are no longer used for display because we have no `AppState`.  
+  Replace them with static strings that show placeholder text (e.g., `"N/A"`).
+- Remove `state_to_color()` – instead use a fixed colour pair (e.g., all cells white) or remove colour entirely, because we have no clip state.
+- Remove the `mouse` callback if it relied on `dispatcher_get_state` – but keep the function body as a no‑op.
+
+## Task 9 – Test the new client
+- Build `looper-client` and verify it compiles without engine object files.
+- Start the engine (`./looper` in `engine/`).
+- Run `./looper-client` and press keys that should generate FIFO commands. Use `cat /tmp/looper_cmd` in another terminal to verify output.
+- Check that commands like `record 2`, `stop`, `bind 3` appear.
+
+## Notes / Future Improvements
+- **State feedback:** The TUI currently shows clip state colours. To restore that, a separate FIFO (or shared memory) for engine‑>client status could be added. Not part of this plan.
+- **MIDI grid / rack view:** These depend on engine features not yet exposed via FIFO. They are removed; can be re‑added later.
+- **Transport commands:** The engine does not have a dedicated transport play/pause command via FIFO; it relies on MIDI notes. Future FIFO extension needed.
+
+This plan produces a clean, minimal client that interfaces only through the named pipe.
+````

client/main.c

@@ -0,0 +1,8 @@
+#include "tui.h"
+
+int main(void) {
+    tui_init();
+    tui_run();
+    tui_cleanup();
+    return 0;
+}

client/makefile

@@ -0,0 +1,18 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -Wpedantic -std=c11
+
+all: looper-client test_status_parse
+
+looper-client: src/main.c src/tui.c
+	$(CC) $(CFLAGS) -Isrc -o $@ $^ -lncurses
+
+test_status_parse: tests/test_status_parse.c
+	$(CC) $(CFLAGS) -Isrc -o test_status_parse tests/test_status_parse.c src/tui.c -lncurses
+
+test: looper-client test_status_parse
+	./test_status_parse
+
+.PHONY: all test clean
+
+clean:
+	rm -f looper-client test_status_parse

client/src/main.c

@@ -0,0 +1,8 @@
+#include "tui.h"
+
+int main(void) {
+    tui_init();
+    tui_run();
+    tui_cleanup();
+    return 0;
+}

client/src/tui.c

@@ -0,0 +1,238 @@
+#include "tui.h"
+#include <ncurses.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <math.h>
+
+/* ---------- FIFO command helper ---------- */
+int send_command(const char *cmd) {
+    const char *fifo_path = getenv("LOOPER_CMD_FIFO");
+    if (!fifo_path) fifo_path = "/tmp/looper_cmd";
+    int fd = open(fifo_path, O_WRONLY | O_NONBLOCK);
+    if (fd < 0) return -1;
+    size_t len = strlen(cmd);
+    int n = write(fd, cmd, len);
+    if (n == (int)len && cmd[len-1] != '\n')
+        write(fd, "\n", 1);
+    close(fd);
+    return (n >= 0) ? 0 : -1;
+}
+
+/* ---------- Stub functions (no engine) ---------- */
+// Clip states – dummy values used as placeholders
+typedef enum { CLIP_EMPTY, CLIP_RECORDING, CLIP_LOOPING, CLIP_STOPPED } ClipState;
+static const char *clip_state_string(ClipState s) { (void)s; return "?"; }
+
+/* Grid dimensions */
+#define GRID_ROWS 8
+#define GRID_COLS 8
+#define NUM_GRIDS 8
+#define CELL_WIDTH 6
+#define CELL_HEIGHT 3
+
+/* status FIFO path */
+#define STATUS_FIFO "/tmp/looper_status"
+#define CMD_FIFO    "/tmp/looper_cmd"
+
+/* Per‑cell state array (indexed by row*GRID_COLS+col) */
+typedef enum { STATE_IDLE, STATE_RECORD, STATE_LOOPING, STATE_PAUSED } ChannelState;
+static ChannelState cell_state[GRID_ROWS * GRID_COLS];
+
+/* Color pairs */
+enum {
+    COLOR_EMPTY=1, COLOR_RECORDING, COLOR_LOOPING, COLOR_STOPPED,
+    COLOR_SELECTED, COLOR_HELP
+};
+
+static int selected_row = 0, selected_col = 0;
+static int selected_grid = 0;
+static bool show_help = false;
+
+/* Visual mode, marks, yank buffer – keep but only local state */
+static int marks[26];
+typedef struct { int *clip_indices; int count; } YankBuffer;
+static YankBuffer yank_buffer = {NULL, 0};
+typedef enum { MODE_NORMAL, MODE_VISUAL, MODE_MOVE } UIMode;
+static UIMode current_mode = MODE_NORMAL;
+static int visual_start_row, visual_start_col, visual_end_row, visual_end_col;
+
+/* Fuzzy search – keep struct but stub carla calls */
+typedef struct {
+    char query[256]; int query_len, selected_index, num_results;
+    int result_indices[256]; bool active; char prompt[64];
+    void (*callback)(const char *);
+    const char **items; int num_items; bool free_items;
+} FuzzySearch;
+static FuzzySearch fuzzy_search = {0};
+
+/* ---------- Parse status line from engine status FIFO ---------- */
+bool parse_status_line(const char *line, int *ch, int *scene, ChannelState *state) {
+    int sta;
+    if (sscanf(line, "CH=%d SC=%d STATE=%d", ch, scene, &sta) == 3) {
+        if (sta >= 0 && sta <= 3) {
+            *state = (ChannelState)sta;
+            return true;
+        }
+    }
+    /* try text-based format */
+    char state_str[32];
+    if (sscanf(line, "CH=%d SC=%d STATE=%31s", ch, scene, state_str) != 3)
+        return false;
+    if (strcmp(state_str, "IDLE") == 0)    { *state = STATE_IDLE;    return true; }
+    if (strcmp(state_str, "RECORD") == 0)  { *state = STATE_RECORD;  return true; }
+    if (strcmp(state_str, "LOOPING") == 0) { *state = STATE_LOOPING; return true; }
+    if (strcmp(state_str, "PAUSED") == 0)  { *state = STATE_PAUSED;  return true; }
+    return false;
+}
+
+/* ---------- State to color (uses cell_state array) ---------- */
+static int state_to_color(ChannelState s) {
+    switch (s) {
+    case STATE_IDLE:    return COLOR_EMPTY;
+    case STATE_RECORD:  return COLOR_RECORDING;
+    case STATE_LOOPING: return COLOR_LOOPING;
+    case STATE_PAUSED:  return COLOR_STOPPED;
+    default:            return COLOR_EMPTY;
+    }
+}
+
+/* ---------- Draw cell (no AppState) ---------- */
+static void draw_cell(int grid, int row, int col, bool selected) {
+    int y = row * CELL_HEIGHT + 3;
+    int x = col * CELL_WIDTH + 1;
+    int idx = row * GRID_COLS + col;
+    ChannelState s = cell_state[idx];
+    int color = selected ? COLOR_SELECTED : state_to_color(s);
+    attron(COLOR_PAIR(color));
+    for (int dy=0; dy<CELL_HEIGHT; dy++)
+        for (int dx=0; dx<CELL_WIDTH; dx++)
+            mvaddch(y+dy, x+dx, ' ');
+    mvprintw(y+1, x+1, "%2d", grid*GRID_ROWS*GRID_COLS + row*GRID_COLS + col);
+    attroff(COLOR_PAIR(color));
+}
+
+static void draw_grid(void) {
+    clear();
+    attron(A_BOLD);
+    mvprintw(0,0,"JACK Looper - Client (FIFO only)");
+    attroff(A_BOLD);
+    for (int r=0; r<GRID_ROWS; r++)
+        for (int c=0; c<GRID_COLS; c++)
+            draw_cell(selected_grid, r, c, r==selected_row && c==selected_col);
+    mvprintw(GRID_ROWS*CELL_HEIGHT+3, 0, "Selected: Grid %d, Row %d, Col %d",
+             selected_grid, selected_row, selected_col);
+    if (show_help) {
+        attron(COLOR_PAIR(COLOR_HELP));
+        mvprintw(GRID_ROWS*CELL_HEIGHT+4, 0, "Help: h/j/k/l navigate, t record, d/D stop, s/S scene, a add, A add_midi, r remove, b bind, u unbind, ? help, Esc/Q quit");
+        attroff(COLOR_PAIR(COLOR_HELP));
+    }
+    refresh();
+}
+
+/* ---------- TUI init ---------- */
+void tui_init(void) {
+    initscr();
+    cbreak(); noecho(); keypad(stdscr, TRUE); curs_set(0);
+    if (!has_colors()) { endwin(); fprintf(stderr,"No colors\n"); exit(1); }
+    start_color();
+    init_pair(COLOR_EMPTY, COLOR_WHITE, COLOR_BLACK);
+    init_pair(COLOR_RECORDING, COLOR_RED, COLOR_BLACK);
+    init_pair(COLOR_LOOPING, COLOR_GREEN, COLOR_BLACK);
+    init_pair(COLOR_STOPPED, COLOR_BLUE, COLOR_BLACK);
+    init_pair(COLOR_SELECTED, COLOR_BLACK, COLOR_CYAN);
+    init_pair(COLOR_HELP, COLOR_CYAN, COLOR_BLACK);
+    for (int i=0;i<26;i++) marks[i] = -1;
+    /* initialise cell states to idle */
+    for (int i = 0; i < GRID_ROWS * GRID_COLS; i++)
+        cell_state[i] = STATE_IDLE;
+}
+
+/* ---------- TUI run ---------- */
+void tui_run(void) {
+    draw_grid();
+    while (1) {
+        /* read any available status lines */
+        int fd = open(STATUS_FIFO, O_RDONLY | O_NONBLOCK);
+        if (fd >= 0) {
+            char buf[256];
+            int n = read(fd, buf, sizeof(buf)-1);
+            if (n > 0) {
+                buf[n] = '\0';
+                char *line = buf;
+                while (*line) {
+                    char *nl = strchr(line, '\n');
+                    if (nl) *nl = '\0';
+                    int ch, sc;
+                    ChannelState st;
+                    if (parse_status_line(line, &ch, &sc, &st)) {
+                        if (ch >= 0 && ch < GRID_ROWS * GRID_COLS)
+                            cell_state[ch] = st;
+                    }
+                    if (nl) {
+                        *nl = '\n';
+                        line = nl + 1;
+                    } else break;
+                }
+            }
+            close(fd);
+        }
+        int chc = getch();
+        switch (chc) {
+        case 'h': case KEY_LEFT:   selected_col = (selected_col-1+GRID_COLS)%GRID_COLS; break;
+        case 'j': case KEY_DOWN:   selected_row = (selected_row+1)%GRID_ROWS; break;
+        case 'k': case KEY_UP:     selected_row = (selected_row-1+GRID_ROWS)%GRID_ROWS; break;
+        case 'l': case KEY_RIGHT:  selected_col = (selected_col+1)%GRID_COLS; break;
+        case 't': {
+            char cmd[32];
+            snprintf(cmd, sizeof(cmd), "record %d\n", selected_col);
+            send_command(cmd);
+            break;
+        }
+        case 's':
+            send_command("scene_next\n");
+            break;
+        case 'S':
+            send_command("scene_prev\n");
+            break;
+        case 'd': case 'D':
+            send_command("stop\n");
+            break;
+        case 'a':
+            send_command("add\n");
+            break;
+        case 'A':
+            send_command("add_midi\n");
+            break;
+        case 'r':
+            send_command("remove\n");
+            break;
+        case 'b': {
+            char cmd[16];
+            snprintf(cmd, sizeof(cmd), "bind %d\n", selected_col);
+            send_command(cmd);
+            break;
+        }
+        case 'u':
+            send_command("unbind\n");
+            break;
+        case '?': show_help = !show_help; break;
+        case 27: case 'Q': return;
+        default: break;
+        }
+        draw_grid();
+    }
+}
+
+void tui_cleanup(void) {
+    if (yank_buffer.clip_indices) free(yank_buffer.clip_indices);
+    /* delete FIFOs */
+    unlink(STATUS_FIFO);
+    unlink(CMD_FIFO);
+    curs_set(1); endwin();
+}

client/src/tui.h

@@ -0,0 +1,9 @@
+#ifndef TUI_H
+#define TUI_H
+
+void tui_init(void);
+void tui_run(void);
+void tui_cleanup(void);
+int send_command(const char *cmd);
+
+#endif

client/tests/test_client.c

@@ -0,0 +1,67 @@
+#include "tui.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#define TEST_PASS 0
+#define TEST_FAIL 1
+
+static int run_single_test(const char *test_name, const char *cmd_sent, const char *expected) {
+    /* build temporary file path */
+    char tmpl[] = "/tmp/looper_test_XXXXXX";
+    int fd = mkstemp(tmpl);
+    if (fd == -1) { perror("mkstemp"); return TEST_FAIL; }
+    close(fd);
+    /* create regular file to mimic a FIFO */
+    fd = open(tmpl, O_CREAT|O_WRONLY|O_TRUNC, 0644);
+    if (fd < 0) { perror("open create"); unlink(tmpl); return TEST_FAIL; }
+    close(fd);
+
+    /* make send_command use this file */
+    setenv("LOOPER_CMD_FIFO", tmpl, 1);
+
+    int ret = send_command(cmd_sent);
+    if (ret != 0) {
+        fprintf(stderr, "FAIL %s: send_command returned %d\n", test_name, ret);
+        unlink(tmpl);
+        return TEST_FAIL;
+    }
+
+    /* read back the written content */
+    FILE *fp = fopen(tmpl, "r");
+    if (!fp) { perror("fopen"); unlink(tmpl); return TEST_FAIL; }
+    char buf[4096];
+    size_t nread = fread(buf, 1, sizeof(buf)-1, fp);
+    fclose(fp);
+    buf[nread] = '\0';
+
+    /* build expected string (send_command always appends a newline) */
+    char expected_line[512];
+    snprintf(expected_line, sizeof(expected_line), "%s\n", expected);
+
+    if (strcmp(buf, expected_line) == 0) {
+        printf("PASS %s\n", test_name);
+        unlink(tmpl);
+        return TEST_PASS;
+    } else {
+        printf("FAIL %s: expected '%s', got '%s'\n", test_name, expected_line, buf);
+        unlink(tmpl);
+        return TEST_FAIL;
+    }
+}
+
+int main(void) {
+    int fail = 0;
+    fail += run_single_test("record_0",        "record 0",    "record 0");
+    fail += run_single_test("record_1",        "record 1",    "record 1");
+    fail += run_single_test("stop",            "stop",        "stop");
+    fail += run_single_test("scene_next",      "scene_next",  "scene_next");
+    fail += run_single_test("scene_prev",      "scene_prev",  "scene_prev");
+    fail += run_single_test("bind_2",          "bind 2",      "bind 2");
+    fail += run_single_test("with_newline",    "record 0\n",  "record 0");
+    printf("%d tests failed.\n", fail);
+    return fail > 0 ? 1 : 0;
+}

client/tests/test_status_parse.c

@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+
+typedef enum { STATE_IDLE, STATE_RECORD, STATE_LOOPING, STATE_PAUSED } ChannelState;
+
+bool parse_status_line(const char *line, int *ch, int *scene, ChannelState *state);
+
+static int test_parse_idle(void) {
+    printf("Test parse_status_line: IDLE\n");
+    int ch, sc; ChannelState st;
+    if (!parse_status_line("CH=0 SC=0 STATE=IDLE\n", &ch, &sc, &st)) {
+        fprintf(stderr, "  FAIL: parse returned false\n");
+        return 1;
+    }
+    if (ch != 0 || sc != 0 || st != STATE_IDLE) {
+        fprintf(stderr, "  FAIL: expected (0,0,IDLE), got (%d,%d,%d)\n", ch, sc, st);
+        return 1;
+    }
+    printf("  PASS\n");
+    return 0;
+}
+
+static int test_parse_recording(void) {
+    printf("Test parse_status_line: RECORD\n");
+    int ch, sc; ChannelState st;
+    if (!parse_status_line("CH=0 SC=0 STATE=RECORD\n", &ch, &sc, &st)) {
+        fprintf(stderr, "  FAIL: parse returned false\n");
+        return 1;
+    }
+    if (ch != 0 || sc != 0 || st != STATE_RECORD) {
+        fprintf(stderr, "  FAIL: expected (0,0,RECORD), got (%d,%d,%d)\n", ch, sc, st);
+        return 1;
+    }
+    printf("  PASS\n");
+    return 0;
+}
+
+static int test_parse_looping(void) {
+    printf("Test parse_status_line: LOOPING\n");
+    int ch, sc; ChannelState st;
+    if (!parse_status_line("CH=0 SC=0 STATE=LOOPING\n", &ch, &sc, &st)) {
+        fprintf(stderr, "  FAIL: parse returned false\n");
+        return 1;
+    }
+    if (ch != 0 || sc != 0 || st != STATE_LOOPING) {
+        fprintf(stderr, "  FAIL: expected (0,0,LOOPING), got (%d,%d,%d)\n", ch, sc, st);
+        return 1;
+    }
+    printf("  PASS\n");
+    return 0;
+}
+
+static int test_parse_paused(void) {
+    printf("Test parse_status_line: PAUSED\n");
+    int ch, sc; ChannelState st;
+    if (!parse_status_line("CH=0 SC=0 STATE=PAUSED\n", &ch, &sc, &st)) {
+        fprintf(stderr, "  FAIL: parse returned false\n");
+        return 1;
+    }
+    if (ch != 0 || sc != 0 || st != STATE_PAUSED) {
+        fprintf(stderr, "  FAIL: expected (0,0,PAUSED), got (%d,%d,%d)\n", ch, sc, st);
+        return 1;
+    }
+    printf("  PASS\n");
+    return 0;
+}
+
+static int test_parse_malformed(void) {
+    printf("Test parse_status_line: malformed\n");
+    int ch, sc; ChannelState st;
+    if (parse_status_line("garbage\n", &ch, &sc, &st)) {
+        fprintf(stderr, "  FAIL: parse should return false for garbage\n");
+        return 1;
+    }
+    printf("  PASS\n");
+    return 0;
+}
+
+int main(void) {
+    int fail = 0;
+    fail += test_parse_idle();
+    fail += test_parse_recording();
+    fail += test_parse_looping();
+    fail += test_parse_paused();
+    fail += test_parse_malformed();
+    return fail;
+}