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-
-============================================
-libtmt - a simple terminal emulation library
-============================================
-
-libtmt is the Tiny Mock Terminal Library.  It provides emulation of a classic
-smart text terminal, by maintaining an in-memory screen image.  Sending text
-and command sequences to libtmt causes it to update this in-memory image,
-which can then be examined and rendered however the user sees fit.
-
-The imagined primary goal for libtmt is to for terminal emulators and
-multiplexers; it provides the terminal emulation layer for the `mtm`_
-terminal multiplexer, for example. Other uses include screen-scraping and
-automated test harnesses.
-
-libtmt is similar in purpose to `libtsm`_, but considerably smaller (500
-lines versus 6500 lines). libtmt is also, in this author's humble opinion,
-considerably easier to use.
-
-.. _`mtm`: https://github.com/deadpixi/mtm
-.. _`libtsm`: https://www.freedesktop.org/wiki/Software/kmscon/libtsm/
-
-Major Features and Advantages
-=============================
-
-Works Out-of-the-Box
-    libtmt emulates a well-known terminal type (`ansi`), the definition of
-    which has been in the terminfo database since at least 1995.  There's no
-    need to install a custom terminfo entry.  There's no claiming to be an
-    xterm but only emulating a small subset of its features. Any program
-    using terminfo works automatically: this includes vim, emacs, mc,
-    cmus, nano, nethack, ...
-
-Portable
-    Written in pure C99.
-    Optionally, the POSIX-mandated `wcwidth` function can be used, which
-    provides minimal support for combining characters.
-
-Small
-    Less than 500 lines of C, including comments and whitespace.
-
-Free
-    Released under a BSD-style license, free for commercial and
-    non-commerical use, with no restrictions on source code release or
-    redistribution.
-
-Simple
-    Only 8 functions to learn, and really you can get by with 6!
-
-International
-    libtmt internally uses wide characters exclusively, and uses your C
-    library's multibyte encoding functions.
-    This means that the library automatically supports any encoding that
-    your operating system does.
-
-How to Use libtmt
-=================
-
-libtmt is a single C file and a single header.  Just include these files
-in your project and you should be good to go.
-
-By default, libtmt uses only ISO standard C99 features,
-but see `Compile-Time Options`_ below.
-
-Example Code
-------------
-
-Below is a simple program fragment giving the flavor of libtmt.
-Note that another good example is the `mtm`_ terminal multiplexer:
-
-.. _`mtm`: https://github.com/deadpixi/mtm
-
-.. code:: c
-
-    #include <stdio.h>
-    #include <stdlib.h>
-    #include "tmt.h"
-
-    /* Forward declaration of a callback.
-     * libtmt will call this function when the terminal's state changes.
-     */
-    void callback(tmt_msg_t m, TMT *vt, const void *a, void *p);
-
-    int
-    main(void)
-    {
-        /* Open a virtual terminal with 2 lines and 10 columns.
-         * The first NULL is just a pointer that will be provided to the
-         * callback; it can be anything. The second NULL specifies that
-         * we want to use the default Alternate Character Set; this
-         * could be a pointer to a wide string that has the desired
-         * characters to be displayed when in ACS mode.
-         */
-        TMT *vt = tmt_open(2, 10, callback, NULL, NULL);
-        if (!vt)
-            return perror("could not allocate terminal"), EXIT_FAILURE;
-
-        /* Write some text to the terminal, using escape sequences to
-         * use a bold rendition.
-         *
-         * The final argument is the length of the input; 0 means that
-         * libtmt will determine the length dynamically using strlen.
-         */
-        tmt_write(vt, "\033[1mhello, world (in bold!)\033[0m", 0);
-
-        /* Writing input to the virtual terminal can (and in this case, did)
-         * call the callback letting us know the screen was updated. See the
-         * callback below to see how that works.
-         */
-        tmt_close(vt);
-        return EXIT_SUCCESS;
-    }
-
-    void
-    callback(tmt_msg_t m, TMT *vt, const void *a, void *p)
-    {
-        /* grab a pointer to the virtual screen */
-        const TMTSCREEN *s = tmt_screen(vt);
-        const TMTPOINT *c = tmt_cursor(vt);
-
-        switch (m){
-            case TMT_MSG_BELL:
-                /* the terminal is requesting that we ring the bell/flash the
-                 * screen/do whatever ^G is supposed to do; a is NULL
-                 */
-                printf("bing!\n");
-                break;
-
-            case TMT_MSG_UPDATE:
-                /* the screen image changed; a is a pointer to the TMTSCREEN */
-                for (size_t r = 0; r < s->nline; r++){
-                    if (s->lines[r]->dirty){
-                        for (size_t c = 0; c < s->ncol; c++){
-                            printf("contents of %zd,%zd: %lc (%s bold)\n", r, c,
-                                   s->lines[r]->chars[c].c,
-                                   s->lines[r]->chars[c].a.bold? "is" : "is not");
-                        }
-                    }
-                }
-
-                /* let tmt know we've redrawn the screen */
-                tmt_clean(vt);
-                break;
-
-            case TMT_MSG_ANSWER:
-                /* the terminal has a response to give to the program; a is a
-                 * pointer to a string */
-                printf("terminal answered %s\n", (const char *)a);
-                break;
-
-            case TMT_MSG_MOVED:
-                /* the cursor moved; a is a pointer to the cursor's TMTPOINT */
-                printf("cursor is now at %zd,%zd\n", c->r, c->c);
-                break;
-        }
-    }
-
-Data Types and Enumerations
----------------------------
-
-.. code:: c
-
-    /* an opaque structure */
-    typedef struct TMT TMT;
-
-    /* possible messages sent to the callback */
-    typedef enum{
-        TMT_MSG_MOVED,  /* the cursor changed position       */
-        TMT_MSG_UPDATE, /* the screen image changed          */
-        TMT_MSG_ANSWER, /* the terminal responded to a query */
-        TMT_MSG_BELL    /* the terminal bell was rung        */
-    } tmt_msg_T;
-
-    /* a callback for the library
-     * m is one of the message constants above
-     * vt is a pointer to the vt structure
-     * r is NULL for TMT_MSG_BELL
-     *   is a pointer to the cursor's TMTPOINT for TMT_MSG_MOVED
-     *   is a pointer to the terminal's TMTSCREEN for TMT_MSG_UPDATE
-     *   is a pointer to a string for TMT_MSG_ANSWER
-     * p is whatever was passed to tmt_open (see below).
-     */
-    typedef void (*TMTCALLBACK)(tmt_msg_t m, struct TMT *vt,
-                                const void *r, void *p);
-
-    /* color definitions */
-    typedef enum{
-        TMT_COLOR_BLACK,
-        TMT_COLOR_RED,
-        TMT_COLOR_GREEN,
-        TMT_COLOR_YELLOW,
-        TMT_COLOR_BLUE,
-        TMT_COLOR_MAGENTA,
-        TMT_COLOR_CYAN,
-        TMT_COLOR_WHITE,
-        TMT_COLOR_DEFAULT /* whatever the host terminal wants it to mean */
-    } tmt_color_t;
-
-    /* graphical rendition */
-    typedef struct TMTATTRS TMTATTRS;
-    struct TMTATTRS{
-        bool bold;      /* character is bold             */
-        bool dim;       /* character is half-bright      */
-        bool underline; /* character is underlined       */
-        bool blink;     /* character is blinking         */
-        bool reverse;   /* character is in reverse video */
-        bool invisible; /* character is invisible        */
-        tmt_color_t fg; /* character foreground color    */
-        tmt_color_t bg; /* character background color    */
-    };
-
-    /* characters */
-    typedef struct TMTCHAR TMTCHAR;
-    struct TMTCHAR{
-        wchar_t  c; /* the character */
-        TMTATTRS a; /* its rendition */
-    };
-
-    /* a position on the screen; upper left corner is 0,0 */
-    typedef struct TMTPOINT TMTPOINT;
-    struct TMTPOINT{
-        size_t r; /* row    */
-        size_t c; /* column */
-    };
-
-    /* a line of characters on the screen;
-     * every line is always as wide as the screen
-     */
-    typedef struct TMTLINE TMTLINE;
-    struct TMTLINE{
-        bool dirty;     /* line has changed since it was last drawn */
-        TMTCHAR chars;  /* the contents of the line                 */
-    };
-
-    /* a virtual terminal screen image */
-    typedef struct TMTSCREEN TMTSCREEN;
-    struct TMTSCREEN{
-        size_t nline;    /* number of rows          */
-        size_t ncol;     /* number of columns       */
-        TMTLINE **lines; /* the lines on the screen */
-    };
-
-Functions
----------
-
-`TMT *tmt_open(size_t nrows, size_t ncols, TMTCALLBACK cb, VOID *p, const wchar *acs);`
-    Creates a new virtual terminal, with `nrows` rows and `ncols` columns.
-    The callback `cb` will be called on updates, and passed `p` as a final
-    argument. See the definition of `tmt_msg_t` above for possible values
-    of each argument to the callback.
-
-    Terminals must have a size of at least two rows and two columns.
-
-    `acs` specifies the characters to use when in Alternate Character Set
-    (ACS) mode. The default string (used if `NULL` is specified) is::
-
-         L"><^v#+:o##+++++~---_++++|<>*!fo"
-
-    See `Alternate Character Set`_ for more information.
-
-    Note that the callback must be ready to be called immediately, as
-    it will be called after initialization of the terminal is done, but
-    before the call to `tmt_open` returns.
-
-`void tmt_close(TMT *vt)`
-    Close and free all resources associated with `vt`.
-
-`bool tmt_resize(TMT *vt, size_t nrows, size_t ncols)`
-    Resize the virtual terminal to have `nrows` rows and `ncols` columns.
-    The contents of the area in common between the two sizes will be preserved.
-
-    Terminals must have a size of at least two rows and two columns.
-
-    If this function returns false, the resize failed (only possible in
-    out-of-memory conditions or invalid sizes). If this happens, the terminal
-    is trashed and the only valid operation is the close the terminal.
-
-`void tmt_write(TMT *vt, const char *s, size_t n);`
-    Write the provided string to the terminal, interpreting any escape
-    sequences contained threin, and update the screen image. The last
-    argument is the length of the input. If set to 0, the length is
-    determined using `strlen`.
-
-    The terminal's callback function may be invoked one or more times before
-    a call to this function returns.
-
-    The string is converted internally to a wide-character string using the
-    system's current multibyte encoding. Each terminal maintains a private
-    multibyte decoding state, and correctly handles mulitbyte characters that
-    span multiple calls to this function (that is, the final byte(s) of `s`
-    may be a partial mulitbyte character to be completed on the next call).
-
-`const TMTSCREEN *tmt_screen(const TMT *vt);`
-    Returns a pointer to the terminal's screen image.
-
-`const TMTPOINT *tmt_cursor(cosnt TMT *vt);`
-    Returns a pointer to the terminal's cursor position.
-
-`void tmt_clean(TMT *vt);`
-    Call this after receiving a `TMT_MSG_UPDATE` or `TMT_MSG_MOVED` callback
-    to let the library know that the program has handled all reported changes
-    to the screen image.
-
-`void tmt_reset(TMT *vt);`
-    Resets the virtual terminal to its default state (colors, multibyte
-    decoding state, rendition, etc).
-
-Special Keys
-------------
-
-To send special keys to a program that is using libtmt for its display,
-write one of the `TMT_KEY_*` strings to that program's standard input
-(*not* to libtmt; it makes no sense to send any of these constants to
-libtmt itself).
-
-The following macros are defined, and are all constant strings:
-
-- TMT_KEY_UP
-- TMT_KEY_DOWN
-- TMT_KEY_RIGHT
-- TMT_KEY_LEFT
-- TMT_KEY_HOME
-- TMT_KEY_END
-- TMT_KEY_INSERT
-- TMT_KEY_BACKSPACE
-- TMT_KEY_ESCAPE
-- TMT_KEY_BACK_TAB
-- TMT_KEY_PAGE_UP
-- TMT_KEY_PAGE_DOWN
-- TMT_KEY_F1 through TMT_KEY_F10
-
-Note also that the classic PC console sent the enter key as
-a carriage return, not a linefeed. Many programs don't care,
-but some do.
-
-Compile-Time Options
---------------------
-
-There are two preprocessor macros that affect libtmt:
-
-`TMT_INVALID_CHAR`
-    Define this to a wide-character. This character will be added to
-    the virtual display when an invalid multibyte character sequence
-    is encountered.
-
-    By default (if you don't define it as something else before compiling),
-    this is `((wchar_t)0xfffd)`, which is the codepoint for the Unicode
-    'REPLACEMENT CHARACTER'. Note that your system might not use Unicode,
-    and its wide-character type might not be able to store a constant as
-    large as `0xfffd`, in which case you'll want to use an alternative.
-
-`TMT_HAS_WCWIDTH`
-    By default, libtmt uses only standard C99 features.  If you define
-    TMT_HAS_WCWIDTH before compiling, libtmt will use the POSIX `wcwidth`
-    function to detect combining characters.
-
-    Note that combining characters are still not handled particularly
-    well, regardless of whether this was defined. Also note that what
-    your C library's `wcwidth` considers a combining character and what
-    the written language in question considers one could be different.
-
-Alternate Character Set
------------------------
-
-The terminal can be switched to and from its "Alternate Character Set" (ACS)
-using escape sequences. The ACS traditionally contained box-drawing and other
-semigraphic characters.
-
-The characters in the ACS are configurable at runtime, by passing a wide string
-to `tmt_open`. The default if none is provided (i.e. the argument is `NULL`)
-uses ASCII characters to approximate the traditional characters.
-
-The string passed to `tmt_open` must be 31 characters long. The characters,
-and their default ASCII-safe values, are in order:
-
-- RIGHT ARROW ">"
-- LEFT ARROW "<"
-- UP ARROW "^"
-- DOWN ARROW "v"
-- BLOCK "#"
-- DIAMOND "+"
-- CHECKERBOARD "#"
-- DEGREE "o"
-- PLUS/MINUS "+"
-- BOARD ":"
-- LOWER RIGHT CORNER "+"
-- UPPER RIGHT CORNER "+"
-- UPPER LEFT CORNER "+"
-- LOWER LEFT CORNER "+"
-- CROSS "+"
-- SCAN LINE 1 "~"
-- SCAN LINE 3 "-"
-- HORIZONTAL LINE "-"
-- SCAN LINE 7 "-"
-- SCAN LINE 9 "_"
-- LEFT TEE "+"
-- RIGHT TEE "+"
-- BOTTOM TEE "+"
-- TOP TEE "+"
-- VERTICAL LINE "|"
-- LESS THAN OR EQUAL "<"
-- GREATER THAN OR EQUAL ">"
-- PI "*"
-- NOT EQUAL "!"
-- POUND STERLING "f"
-- BULLET "o"
-
-If your system's wide character type's character set corresponds to the
-Universal Character Set (UCS/Unicode), the following wide string is a
-good option to use::
-
-    L"→←↑↓■◆▒°±▒┘┐┌└┼⎺───⎽├┤┴┬│≤≥π≠£•"
-
-**Note that multibyte decoding is disabled in ACS mode.** The traditional
-implementations of the "ansi" terminal type (i.e. IBM PCs and compatibles)
-had no concept of multibyte encodings and used the character codes
-outside the ASCII range for various special semigraphic characters.
-(Technically they had an entire alternate character set as well via the
-code page mechanism, but that's beyond the scope of this explanation.)
-
-The end result is that the terminfo definition of "ansi" sends characters
-with the high bit set when in ACS mode. This breaks several multibyte
-encoding schemes (including, most importantly, UTF-8).
-
-As a result, libtmt does not attempt to decode multibyte characters in
-ACS mode, since that would break the multibyte encoding, the semigraphic
-characters, or both.
-
-In general this isn't a problem, since programs explicitly switch to and
-from ACS mode using escape sequences.
-
-When in ACS mode, bytes that are not special members of the alternate
-character set (that is, bytes not mapped to the string provided to
-`tmt_open`) are passed unchanged to the terminal.
-
-Supported Input and Escape Sequences
-====================================
-
-Internally libtmt uses your C library's/compiler's idea of a wide character
-for all characters, so you should be able to use whatever characters you want
-when writing to the virtual terminal (but see `Alternate Character Set`_).
-
-The following escape sequences are recognized and will be processed
-specially.
-
-In the descriptions below, "ESC" means a literal escape character and "Ps"
-means zero or more decimal numeric arguments separated by semicolons.
-In descriptions "P1", "P2", etc, refer to the first parameter, second
-parameter, and so on.  If a required parameter is omitted, it defaults
-to the smallest meaningful value (zero if the command accepts zero as
-an argument, one otherwise).  Any number of parameters may be passed,
-but any after the first eight are ignored.
-
-Unless explicitly stated below, cursor motions past the edges of the screen
-are ignored and do not result in scrolling.  When characters are moved,
-the spaces left behind are filled with blanks and any characters moved
-off the edges of the screen are lost.
-
-======================  ======================================================================
-Sequence                Action
-======================  ======================================================================
-0x07 (Bell)             Callback with TMT_MSG_BELL
-0x08 (Backspace)        Cursor left one cell
-0x09 (Tab)              Cursor to next tab stop or end of line
-0x0a (Carriage Return)  Cursor to first cell on this line
-0x0d (Linefeed)         Cursor to same column one line down, scroll if needed
-ESC H                   Set a tabstop in this column
-ESC 7                   Save cursor position and current graphical state
-ESC 8                   Restore saved cursor position and current graphical state
-ESC c                   Reset terminal to default state
-ESC [ Ps A              Cursor up P1 rows
-ESC [ Ps B              Cursor down P1 rows
-ESC [ Ps C              Cursor right P1 columns
-ESC [ Ps D              Cursor left P1 columns
-ESC [ Ps E              Cursor to first column of line P1 rows down from current
-ESC [ Ps F              Cursor to first column of line P1 rows up from current
-ESC [ Ps G              Cursor to column P1
-ESC [ Ps d              Cursor to row P1
-ESC [ Ps H              Cursor to row P1, column P2
-ESC [ Ps f              Alias for ESC [ Ps H
-ESC [ Ps I              Cursor to next tab stop
-ESC [ Ps J              Clear screen
-                        P1 == 0: from cursor to end of screen
-                        P1 == 1: from beginning of screen to cursor
-                        P1 == 2: entire screen
-ESC [ Ps K              Clear line
-                        P1 == 0: from cursor to end of line
-                        P1 == 1: from beginning of line to cursor
-                        P1 == 2: entire line
-ESC [ Ps L              Insert P1 lines at cursor, scrolling lines below down
-ESC [ Ps M              Delete P1 lines at cursor, scrolling lines below up
-ESC [ Ps P              Delete P1 characters at cursor, moving characters to the right over
-ESC [ Ps S              Scroll screen up P1 lines
-ESC [ Ps T              Scroll screen down P1 lines
-ESC [ Ps X              Erase P1 characters at cursor (overwrite with spaces)
-ESC [ Ps Z              Go to previous tab stop
-ESC [ Ps b              Repeat previous character P1 times
-ESC [ Ps c              Callback with TMT_MSG_ANSWER "\033[?6c"
-ESC [ Ps g              If P1 == 3, clear all tabstops
-ESC [ Ps h              If P1 == 25, show the cursor (if it was hidden)
-ESC [ Ps m              Change graphical rendition state; see below
-ESC [ Ps l              If P1 == 25, hide the cursor
-ESC [ Ps n              If P1 == 6, callback with TMT_MSG_ANSWER "\033[%d;%dR"
-                        with cursor row, column
-ESC [ Ps s              Alias for ESC 7
-ESC [ Ps u              Alias for ESC 8
-ESC [ Ps @              Insert P1 blank spaces at cursor, moving characters to the right over
-======================  ======================================================================
-
-For the `ESC [ Ps m` escape sequence above ("Set Graphic Rendition"),
-up to eight parameters may be passed; the results are cumulative:
-
-==============   =================================================
-Rendition Code   Meaning
-==============   =================================================
-0                Reset all graphic rendition attributes to default
-1                Bold
-2                Dim (half bright)
-4                Underline
-5                Blink
-7                Reverse video
-8                Invisible
-10               Leave ACS mode
-11               Enter ACS mode
-22               Bold off
-23               Dim (half bright) off
-24               Underline off
-25               Blink off
-27               Reverse video off
-28               Invisible off
-30               Foreground black
-31               Foreground red
-32               Foreground green
-33               Foreground yellow
-34               Foreground blue
-35               Foreground magenta
-36               Foreground cyan
-37               Foreground white
-39               Foreground default color
-40               Background black
-41               Background red
-42               Background green
-43               Background yellow
-44               Background blue
-45               Background magenta
-46               Background cyan
-47               Background white
-49               Background default color
-==============   =================================================
-
-Other escape sequences are recognized but ignored.  This includes escape
-sequences for switching out codesets (officially, all code sets are defined
-as equivalent in libtmt), and the various "Media Copy" escape sequences
-used to print output on paper (officially, there is no printer attached
-to libtmt).
-
-Additionally, "?" characters are stripped out of escape sequence parameter
-lists for compatibility purposes.
-
-Known Issues
-============
-
-- Combining characters are "handled" by ignoring them
-  (when compiled with `TMT_HAS_WCWIDTH`) or by printing them separately.
-- Double-width characters are rendered as single-width invalid
-  characters.
-- The documentation and error messages are available only in English.
-
-Frequently Asked Questions
-==========================
-
-What programs work with libtmt?
--------------------------------
-
-Pretty much all of them.  Any program that doesn't assume what terminal
-it's running under should work without problem; this includes any program
-that uses the terminfo, termcap, or (pd|n)?curses libraries.  Any program
-that assumes it's running under some specific terminal might fail if its
-assumption is wrong, and not just under libtmt.
-
-I've tested quite a few applications in libtmt and they've worked flawlessly:
-vim, GNU emacs, nano, cmus, mc (Midnight Commander), and others just work
-with no changes.
-
-What programs don't work with libtmt?
--------------------------------------
-
-Breakage with libtmt is of two kinds: breakage due to assuming a terminal
-type, and reduced functionality.
-
-In all my testing, I only found one program that didn't work correctly by
-default with libtmt: recent versions of Debian's `apt`_ assume a terminal
-with definable scrolling regions to draw a fancy progress bar during
-package installation.  Using apt in its default configuration in libtmt will
-result in a corrupted display (that can be fixed by clearing the screen).
-
-.. _`apt`: https://wiki.debian.org/Apt
-
-In my honest opinion, this is a bug in apt: it shouldn't assume the type
-of terminal it's running in.
-
-The second kind of breakage is when not all of a program's features are
-available.  The biggest missing feature here is mouse support: libtmt
-doesn't, and probably never will, support mouse tracking.  I know of many
-programs that *can* use mouse tracking in a terminal, but I don't know
-of any that *require* it.  Most (if not all?) programs of this kind would
-still be completely usable in libtmt.
-
-License
--------
-
-Copyright (c) 2017 Rob King
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-- Redistributions of source code must retain the above copyright
-  notice, this list of conditions and the following disclaimer.
-- Redistributions in binary form must reproduce the above copyright
-  notice, this list of conditions and the following disclaimer in the
-  documentation and/or other materials provided with the distribution.
-- Neither the name of the copyright holder nor the
-  names of contributors may be used to endorse or promote products
-  derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS,
-COPYRIGHT HOLDERS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
-USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.