Enable multiline input

Adds a nonl() call to avoid translation from \r to \n when pressing
enter.
C-J -> \n
Enter -> \r
To allow multiline input, \n chars (e.g. when pressing C-J) are replaced
with a pilcrow. After hitting enter, every pilcrow is substituted with
\n again.

src/chat.c

@@ -882,7 +882,6 @@ static void send_action(ToxWindow *self, ChatContext *ctx, Tox *m, char *action)
 
 static void chat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
 {
-
     ChatContext *ctx = self->chatwin;
     StatusBar *statusbar = self->stb;
 
@@ -898,7 +897,7 @@ static void chat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
         return;
     }
 
-    if (ltr) {    /* char is printable */
+    if (ltr || key == '\n') {    /* char is printable */
         input_new_char(self, key, x, y, x2, y2);
 
         if (ctx->line[0] != '/' && !ctx->self_is_typing && statusbar->connection != TOX_CONNECTION_NONE)
@@ -940,17 +939,20 @@ static void chat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
             sound_notify(self, notif_error, 0, NULL);
         }
 
-    } else if (key == '\n') {
+    } else if (key == '\r') {
         rm_trailing_spaces_buf(ctx);
 
-        char line[MAX_STR_SIZE];
+        if (!wstring_is_empty(ctx->line))
+        {
+            add_line_to_hist(ctx);
+
+            wstrsubst(ctx->line, L'¶', L'\n');
+
+            char line[MAX_STR_SIZE] = {0};
 
             if (wcs_to_mbs_buf(line, ctx->line, MAX_STR_SIZE) == -1)
                 memset(&line, 0, sizeof(line));
 
-        if (!string_is_empty(line))
-            add_line_to_hist(ctx);
-
             if (line[0] == '/') {
                 if (strcmp(line, "/close") == 0) {
                     kill_chat_window(self, m);
@@ -960,7 +962,7 @@ static void chat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
                 } else {
                     execute(ctx->history, self, m, line, CHAT_COMMAND_MODE);
                 }
-        } else if (!string_is_empty(line)) {
+            } else {
                 char selfname[TOX_MAX_NAME_LENGTH];
                 tox_self_get_name(m, (uint8_t *) selfname);
 
@@ -973,6 +975,7 @@ static void chat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
                 line_info_add(self, timefrmt, selfname, NULL, OUT_MSG, 0, 0, "%s", line);
                 cqueue_add(ctx->cqueue, line, strlen(line), OUT_MSG, ctx->hst->line_end->id + 1);
             }
+        }
 
         wclear(ctx->linewin);
         wmove(self->window, y2 - CURS_Y_OFFSET, 0);

src/friendlist.c

@@ -757,7 +757,7 @@ static void friendlist_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
         return;
 
     switch (key) {
-        case '\n':
+        case '\r':
             if (blocklist_view)
                 break;
 

src/global_commands.c

@@ -36,6 +36,7 @@
 #include "avatars.h"
 #include "name_lookup.h"
 #include "qr_code.h"
+#include "toxic_strings.h"
 
 extern char *DATA_FILE;
 extern ToxWindow *prompt;
@@ -513,11 +514,12 @@ void cmd_note(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MA
         return;
     }
 
-    /* remove opening and closing quotes */
+    /* remove opening and closing quotes and replace linebreaks with spaces */
     char msg[MAX_STR_SIZE];
     snprintf(msg, sizeof(msg), "%s", &argv[1][1]);
     int len = strlen(msg) - 1;
     msg[len] = '\0';
+    strsubst(msg, '\n', ' ');
 
     prompt_update_statusmessage(prompt, m, msg);
 }

src/groupchat.c

@@ -571,7 +571,7 @@ static void groupchat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
         return;
     }
 
-    if (ltr) {    /* char is printable */
+    if (ltr || key == '\n') {    /* char is printable */
         input_new_char(self, key, x, y, x2, y2);
         return;
     }
@@ -615,17 +615,20 @@ static void groupchat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
     } else if (key == user_settings->key_peer_list_up) {
         if (groupchats[self->num].side_pos > 0)
             --groupchats[self->num].side_pos;
-    } else if (key == '\n') {
+    } else if (key == '\r') {
         rm_trailing_spaces_buf(ctx);
 
+        if (!wstring_is_empty(ctx->line))
+        {
+            add_line_to_hist(ctx);
+
+            wstrsubst(ctx->line, L'¶', L'\n');
+
             char line[MAX_STR_SIZE];
 
             if (wcs_to_mbs_buf(line, ctx->line, MAX_STR_SIZE) == -1)
                 memset(&line, 0, sizeof(line));
 
-        if (!string_is_empty(line))
-            add_line_to_hist(ctx);
-
             if (line[0] == '/') {
                 if (strcmp(line, "/close") == 0) {
                     close_groupchat(self, m, self->num);
@@ -635,12 +638,13 @@ static void groupchat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
                 } else {
                     execute(ctx->history, self, m, line, GROUPCHAT_COMMAND_MODE);
                 }
-        } else if (!string_is_empty(line)) {
+            } else {
                 if (tox_group_message_send(m, self->num, (uint8_t *) line, strlen(line)) == -1) {
                     const char *errmsg = " * Failed to send message.";
                     line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, RED, errmsg);
                 }
             }
+        }
 
         wclear(ctx->linewin);
         wmove(self->window, y2 - CURS_Y_OFFSET, 0);

src/input.c

@@ -42,9 +42,12 @@ void input_new_char(ToxWindow *self, wint_t key, int x, int y, int mx_x, int mx_
 {
     ChatContext *ctx = self->chatwin;
 
+    /* this is the only place we need to do this check */
+    if (key == '\n')
+        key = L'¶';
+
     int cur_len = wcwidth(key);
 
-    /* this is the only place we need to do this check */
     if (cur_len == -1) {
         sound_notify(self, notif_error, 0, NULL);
         return;

src/misc_tools.c

@@ -176,6 +176,15 @@ int string_is_empty(const char *string)
     return string[0] == '\0';
 }
 
+/* Returns 1 if the string is empty, 0 otherwise */
+int wstring_is_empty(const wchar_t *string)
+{
+    if (!string)
+        return true;
+
+    return string[0] == L'\0';
+}
+
 /* convert a multibyte string to a wide character string and puts in buf. */
 int mbs_to_wcs_buf(wchar_t *buf, const char *string, size_t n)
 {

src/misc_tools.h

@@ -78,6 +78,9 @@ void update_unix_time(void);
 /* Returns 1 if the string is empty, 0 otherwise */
 int string_is_empty(const char *string);
 
+/* Same as above but for wide character strings */
+int wstring_is_empty(const wchar_t *string);
+
 /* convert a multibyte string to a wide character string (must provide buffer) */
 int char_to_wcs_buf(wchar_t *buf, const char *string, size_t n);
 

src/prompt.c

@@ -195,7 +195,7 @@ static void prompt_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
         return;
     }
 
-    if (ltr) {    /* char is printable */
+    if (ltr || key == '\n') {    /* char is printable */
         input_new_char(self, key, x, y, x2, y2);
         return;
     }
@@ -232,19 +232,22 @@ static void prompt_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
         } else {
             sound_notify(self, notif_error, 0, NULL);
         }
-    } else if (key == '\n') {
+    } else if (key == '\r') {
         rm_trailing_spaces_buf(ctx);
 
+        if (!wstring_is_empty(ctx->line))
+        {
+            add_line_to_hist(ctx);
+            wstrsubst(ctx->line, L'¶', L'\n');
+
             char line[MAX_STR_SIZE] = {0};
 
             if (wcs_to_mbs_buf(line, ctx->line, MAX_STR_SIZE) == -1)
                 memset(&line, 0, sizeof(line));
 
-        if (!string_is_empty(line))
-            add_line_to_hist(ctx);
-
             line_info_add(self, NULL, NULL, NULL, PROMPT, 0, 0, "%s", line);
             execute(ctx->history, self, m, line, GLOBAL_COMMAND_MODE);
+        }
 
         wclear(ctx->linewin);
         wmove(self->window, y2 - CURS_Y_OFFSET, 0);

src/toxic.c

@@ -200,6 +200,7 @@ static void init_term(void)
     cbreak();
     keypad(stdscr, 1);
     noecho();
+    nonl();
     timeout(100);
 
     if (has_colors()) {

src/toxic_strings.c

@@ -166,19 +166,19 @@ void reset_buf(ChatContext *ctx)
     ctx->start = 0;
 }
 
-/* Removes trailing spaces from line. */
+/* Removes trailing spaces and newlines from line. */
 void rm_trailing_spaces_buf(ChatContext *ctx)
 {
     if (ctx->len <= 0)
         return;
 
-    if (ctx->line[ctx->len - 1] != ' ')
+    if (ctx->line[ctx->len - 1] != ' ' && ctx->line[ctx->len - 1] != L'¶')
         return;
 
     int i;
 
     for (i = ctx->len - 1; i >= 0; --i) {
-        if (ctx->line[i] != ' ')
+        if (ctx->line[i] != ' ' && ctx->line[i] != L'¶')
             break;
     }
 
@@ -242,3 +242,19 @@ void fetch_hist_item(ChatContext *ctx, int key_dir)
     ctx->pos = h_len;
     ctx->len = h_len;
 }
+
+void strsubst(char* str, char old, char new)
+{
+    int i;
+    for (i = 0; str[i] != '\0'; ++i)
+        if (str[i] == old)
+           str[i] = new;
+}
+
+void wstrsubst(wchar_t* str, wchar_t old, wchar_t new)
+{
+    int i;
+    for (i = 0; str[i] != L'\0'; ++i)
+        if (str[i] == old)
+           str[i] = new;
+}

src/toxic_strings.h

@@ -66,4 +66,8 @@ void add_line_to_hist(ChatContext *ctx);
    resets line if at end of history */
 void fetch_hist_item(ChatContext *ctx, int key_dir);
 
+/* Substitutes all occurrences of old with new. */
+void strsubst(char *str, char old, char new);
+void wstrsubst(wchar_t *str, wchar_t old, wchar_t new);
+
 #endif /* #define TOXIC_STRINGS_H */