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Diffstat (limited to '')
| -rw-r--r-- | bin/shotty.c | 648 |
1 files changed, 648 insertions, 0 deletions
diff --git a/bin/shotty.c b/bin/shotty.c new file mode 100644 index 00000000..de7fc8ac --- /dev/null +++ b/bin/shotty.c @@ -0,0 +1,648 @@ +/* Copyright (C) 2019 June McEnroe <june@causal.agency> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <assert.h> +#include <err.h> +#include <locale.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sysexits.h> +#include <unistd.h> +#include <wchar.h> + +#define BIT(x) x##Bit, x = 1 << x##Bit, x##Bit_ = x##Bit + +typedef unsigned uint; + +enum { + NUL, SOH, STX, ETX, EOT, ENQ, ACK, BEL, + BS, HT, NL, VT, NP, CR, SO, SI, + DLE, DC1, DC2, DC3, DC4, NAK, SYN, ETB, + CAN, EM, SUB, ESC, FS, GS, RS, US, + DEL = 0x7F, +}; + +enum Attr { + BIT(Bold), + BIT(Dim), + BIT(Italic), + BIT(Underline), + BIT(Blink), + BIT(Reverse), +}; + +struct Style { + enum Attr attr; + int bg, fg; +}; + +struct Cell { + struct Style style; + wchar_t ch; +}; + +static uint rows = 24, cols = 80; +static struct Cell *cells; + +static struct Cell *cell(uint y, uint x) { + assert(y <= rows); + assert(x <= cols); + assert(y * cols + x <= rows * cols); + return &cells[y * cols + x]; +} + +static uint y, x; +static struct Style style = { .bg = -1, .fg = -1 }; + +static struct { + uint y, x; +} save; + +enum { ParamCap = 16 }; +static struct { + uint s[ParamCap]; + uint n, i; +} param; + +static uint p(uint i, uint z) { + return (i < param.n ? param.s[i] : z); +} + +static uint min(uint a, uint b) { + return (a < b ? a : b); +} + +#define _ch ch __attribute__((unused)) +typedef void Action(wchar_t ch); + +static void nop(wchar_t _ch) { +} + +static void csi(wchar_t _ch) { + memset(¶m, 0, sizeof(param)); +} + +static void csiSep(wchar_t _ch) { + if (param.n == ParamCap) return; + if (!param.n) param.n++; + param.n++; + param.i++; +} + +static void csiDigit(wchar_t ch) { + param.s[param.i] *= 10; + param.s[param.i] += ch - L'0'; + if (!param.n) param.n++; +} + +static void bs(wchar_t _ch) { if (x) x--; } +static void ht(wchar_t _ch) { x = min(x - x % 8 + 8, cols - 1); } +static void cr(wchar_t _ch) { x = 0; } +static void cuu(wchar_t _ch) { y -= min(p(0, 1), y); } +static void cud(wchar_t _ch) { y = min(y + p(0, 1), rows - 1); } +static void cuf(wchar_t _ch) { x = min(x + p(0, 1), cols - 1); } +static void cub(wchar_t _ch) { x -= min(p(0, 1), x); } +static void cnl(wchar_t _ch) { x = 0; cud(0); } +static void cpl(wchar_t _ch) { x = 0; cuu(0); } +static void cha(wchar_t _ch) { x = min(p(0, 1) - 1, cols - 1); } +static void vpa(wchar_t _ch) { y = min(p(0, 1) - 1, rows - 1); } +static void cup(wchar_t _ch) { + y = min(p(0, 1) - 1, rows - 1); + x = min(p(1, 1) - 1, cols - 1); +} +static void decsc(wchar_t _ch) { + save.y = y; + save.x = x; +} +static void decrc(wchar_t _ch) { + y = save.y; + x = save.x; +} + +static void move(struct Cell *dst, struct Cell *src, size_t len) { + memmove(dst, src, sizeof(*dst) * len); +} + +static void erase(struct Cell *at, struct Cell *to) { + for (; at < to; ++at) { + at->style = style; + at->ch = L' '; + } +} + +static void ed(wchar_t _ch) { + erase( + (p(0, 0) == 0 ? cell(y, x) : cell(0, 0)), + (p(0, 0) == 1 ? cell(y, x) : cell(rows - 1, cols)) + ); +} +static void el(wchar_t _ch) { + erase( + (p(0, 0) == 0 ? cell(y, x) : cell(y, 0)), + (p(0, 0) == 1 ? cell(y, x) : cell(y, cols)) + ); +} +static void ech(wchar_t _ch) { + erase(cell(y, x), cell(y, min(x + p(0, 1), cols))); +} + +static void dch(wchar_t _ch) { + uint n = min(p(0, 1), cols - x); + move(cell(y, x), cell(y, x + n), cols - x - n); + erase(cell(y, cols - n), cell(y, cols)); +} +static void ich(wchar_t _ch) { + uint n = min(p(0, 1), cols - x); + move(cell(y, x + n), cell(y, x), cols - x - n); + erase(cell(y, x), cell(y, x + n)); +} + +static struct { + uint top, bot; +} scroll; + +static void scrollUp(uint top, uint n) { + n = min(n, scroll.bot - top); + move(cell(top, 0), cell(top + n, 0), cols * (scroll.bot - top - n)); + erase(cell(scroll.bot - n, 0), cell(scroll.bot, 0)); +} + +static void scrollDown(uint top, uint n) { + n = min(n, scroll.bot - top); + move(cell(top + n, 0), cell(top, 0), cols * (scroll.bot - top - n)); + erase(cell(top, 0), cell(top + n, 0)); +} + +static void decstbm(wchar_t _ch) { + scroll.bot = min(p(1, rows), rows); + scroll.top = min(p(0, 1) - 1, scroll.bot); +} + +static void su(wchar_t _ch) { scrollUp(scroll.top, p(0, 1)); } +static void sd(wchar_t _ch) { scrollDown(scroll.top, p(0, 1)); } +static void dl(wchar_t _ch) { scrollUp(min(y, scroll.bot), p(0, 1)); } +static void il(wchar_t _ch) { scrollDown(min(y, scroll.bot), p(0, 1)); } + +static void nl(wchar_t _ch) { + if (y + 1 == scroll.bot) { + scrollUp(scroll.top, 1); + } else { + y = min(y + 1, rows - 1); + } +} +static void ri(wchar_t _ch) { + if (y == scroll.top) { + scrollDown(scroll.top, 1); + } else { + if (y) y--; + } +} + +static enum Mode { + BIT(Insert), + BIT(Wrap), + BIT(Cursor), +} mode = Wrap | Cursor; + +static enum Mode paramMode(void) { + enum Mode mode = 0; + for (uint i = 0; i < param.n; ++i) { + switch (param.s[i]) { + break; case 4: mode |= Insert; + break; default: warnx("unhandled SM/RM %u", param.s[i]); + } + } + return mode; +} + +static enum Mode paramDECMode(void) { + enum Mode mode = 0; + for (uint i = 0; i < param.n; ++i) { + switch (param.s[i]) { + break; case 1: // DECCKM + break; case 7: mode |= Wrap; + break; case 12: // "Start Blinking Cursor" + break; case 25: mode |= Cursor; + break; default: { + if (param.s[i] < 1000) { + warnx("unhandled DECSET/DECRST %u", param.s[i]); + } + } + } + } + return mode; +} + +static void sm(wchar_t _ch) { mode |= paramMode(); } +static void rm(wchar_t _ch) { mode &= ~paramMode(); } +static void decset(wchar_t _ch) { mode |= paramDECMode(); } +static void decrst(wchar_t _ch) { mode &= ~paramDECMode(); } + +enum { + Reset, + SetBold, + SetDim, + SetItalic, + SetUnderline, + SetBlink, + SetReverse = 7, + + UnsetBoldDim = 22, + UnsetItalic, + UnsetUnderline, + UnsetBlink, + UnsetReverse = 27, + + SetFg0 = 30, + SetFg7 = 37, + SetFg, + ResetFg, + SetBg0 = 40, + SetBg7 = 47, + SetBg, + ResetBg, + + SetFg8 = 90, + SetFgF = 97, + SetBg8 = 100, + SetBgF = 107, + + Color256 = 5, +}; + +static void sgr(wchar_t _ch) { + uint n = param.i + 1; + for (uint i = 0; i < n; ++i) { + switch (param.s[i]) { + break; case Reset: style = (struct Style) { .bg = -1, .fg = -1 }; + + break; case SetBold: style.attr |= Bold; style.attr &= ~Dim; + break; case SetDim: style.attr |= Dim; style.attr &= ~Bold; + break; case SetItalic: style.attr |= Italic; + break; case SetUnderline: style.attr |= Underline; + break; case SetBlink: style.attr |= Blink; + break; case SetReverse: style.attr |= Reverse; + + break; case UnsetBoldDim: style.attr &= ~(Bold | Dim); + break; case UnsetItalic: style.attr &= ~Italic; + break; case UnsetUnderline: style.attr &= ~Underline; + break; case UnsetBlink: style.attr &= ~Blink; + break; case UnsetReverse: style.attr &= ~Reverse; + + break; case SetFg: { + if (++i < n && param.s[i] == Color256) { + if (++i < n) style.fg = param.s[i]; + } + } + break; case SetBg: { + if (++i < n && param.s[i] == Color256) { + if (++i < n) style.bg = param.s[i]; + } + } + + break; case ResetFg: style.fg = -1; + break; case ResetBg: style.bg = -1; + + break; default: { + uint p = param.s[i]; + if (p >= SetFg0 && p <= SetFg7) { + style.fg = p - SetFg0; + } else if (p >= SetBg0 && p <= SetBg7) { + style.bg = p - SetBg0; + } else if (p >= SetFg8 && p <= SetFgF) { + style.fg = 8 + p - SetFg8; + } else if (p >= SetBg8 && p <= SetBgF) { + style.bg = 8 + p - SetBg8; + } else { + warnx("unhandled SGR %u", p); + } + } + } + } +} + +static enum { + USASCII, + DECSpecial, +} charset; + +static void usascii(wchar_t _ch) { charset = USASCII; } +static void decSpecial(wchar_t _ch) { charset = DECSpecial; } + +static const wchar_t AltCharset[128] = { + ['`'] = L'◆', ['a'] = L'▒', ['f'] = L'°', ['g'] = L'±', ['i'] = L'␋', + ['j'] = L'┘', ['k'] = L'┐', ['l'] = L'┌', ['m'] = L'└', ['n'] = L'┼', + ['o'] = L'⎺', ['p'] = L'⎻', ['q'] = L'─', ['r'] = L'⎼', ['s'] = L'⎽', + ['t'] = L'├', ['u'] = L'┤', ['v'] = L'┴', ['w'] = L'┬', ['x'] = L'│', + ['y'] = L'≤', ['z'] = L'≥', ['{'] = L'π', ['|'] = L'≠', ['}'] = L'£', + ['~'] = L'·', +}; + +static void add(wchar_t ch) { + if (charset == DECSpecial && ch < 128 && AltCharset[ch]) { + ch = AltCharset[ch]; + } + + int width = wcwidth(ch); + if (width < 0) { + warnx("unhandled \\u%02X", ch); + return; + } + + if (mode & Insert) { + uint n = min(width, cols - x); + move(cell(y, x + n), cell(y, x), cols - x - n); + } + if (mode & Wrap && x + width > cols) { + cr(0); + nl(0); + } + + cell(y, x)->style = style; + cell(y, x)->ch = ch; + for (int i = 1; i < width && x + i < cols; ++i) { + cell(y, x + i)->style = style; + cell(y, x + i)->ch = L'\0'; + } + x = min(x + width, (mode & Wrap ? cols : cols - 1)); +} + +static void html(void); +static void mc(wchar_t _ch) { + if (p(0, 0) == 10) { + html(); + } else { + warnx("unhandled CSI %u MC", p(0, 0)); + } +} + +static enum { + Data, + Esc, + G0, + CSI, + CSILt, + CSIEq, + CSIGt, + CSIQm, + CSIInter, + OSC, + OSCEsc, +} state; + +static void escDefault(wchar_t ch) { + warnx("unhandled ESC %lc", ch); +} + +static void g0Default(wchar_t ch) { + warnx("unhandled G0 %lc", ch); + charset = USASCII; +} + +static void csiInter(wchar_t ch) { + switch (state) { + break; case CSI: warnx("unhandled CSI %lc ...", ch); + break; case CSILt: warnx("unhandled CSI < %lc ...", ch); + break; case CSIEq: warnx("unhandled CSI = %lc ...", ch); + break; case CSIGt: warnx("unhandled CSI > %lc ...", ch); + break; case CSIQm: warnx("unhandled CSI ? %lc ...", ch); + break; default: abort(); + } +} + +static void csiFinal(wchar_t ch) { + switch (state) { + break; case CSI: warnx("unhandled CSI %lc", ch); + break; case CSILt: warnx("unhandled CSI < %lc", ch); + break; case CSIEq: warnx("unhandled CSI = %lc", ch); + break; case CSIGt: warnx("unhandled CSI > %lc", ch); + break; case CSIQm: warnx("unhandled CSI ? %lc", ch); + break; case CSIInter: warnx("unhandled CSI ... %lc", ch); + break; default: abort(); + } +} + +#define S(s) break; case s: switch (ch) +#define A(c, a, s) break; case c: a(ch); state = s +#define D(a, s) break; default: a(ch); state = s +static void update(wchar_t ch) { + switch (state) { + default: abort(); + + S(Data) { + A(BEL, nop, Data); + A(BS, bs, Data); + A(HT, ht, Data); + A(NL, nl, Data); + A(CR, cr, Data); + A(ESC, nop, Esc); + D(add, Data); + } + + S(Esc) { + A('(', nop, G0); + A('7', decsc, Data); + A('8', decrc, Data); + A('=', nop, Data); + A('>', nop, Data); + A('M', ri, Data); + A('[', csi, CSI); + A(']', nop, OSC); + D(escDefault, Data); + } + S(G0) { + A('0', decSpecial, Data); + A('B', usascii, Data); + D(g0Default, Data); + } + + S(CSI) { + A(' ' ... '/', csiInter, CSIInter); + A('0' ... '9', csiDigit, CSI); + A(':', nop, CSI); + A(';', csiSep, CSI); + A('<', nop, CSILt); + A('=', nop, CSIEq); + A('>', nop, CSIGt); + A('?', nop, CSIQm); + A('@', ich, Data); + A('A', cuu, Data); + A('B', cud, Data); + A('C', cuf, Data); + A('D', cub, Data); + A('E', cnl, Data); + A('F', cpl, Data); + A('G', cha, Data); + A('H', cup, Data); + A('J', ed, Data); + A('K', el, Data); + A('L', il, Data); + A('M', dl, Data); + A('P', dch, Data); + A('S', su, Data); + A('T', sd, Data); + A('X', ech, Data); + A('d', vpa, Data); + A('h', sm, Data); + A('i', mc, Data); + A('l', rm, Data); + A('m', sgr, Data); + A('r', decstbm, Data); + A('t', nop, Data); + D(csiFinal, Data); + } + + S(CSILt ... CSIGt) { + A(' ' ... '/', csiInter, CSIInter); + A('0' ... '9', csiDigit, state); + A(':', nop, state); + A(';', csiSep, state); + D(csiFinal, Data); + } + + S(CSIQm) { + A(' ' ... '/', csiInter, CSIInter); + A('0' ... '9', csiDigit, CSIQm); + A(':', nop, CSIQm); + A(';', csiSep, CSIQm); + A('h', decset, Data); + A('l', decrst, Data); + D(csiFinal, Data); + } + + S(CSIInter) { + D(csiFinal, Data); + } + + S(OSC) { + A(BEL, nop, Data); + A(ESC, nop, OSCEsc); + D(nop, OSC); + } + S(OSCEsc) { + A('\\', nop, Data); + D(nop, OSC); + } + } +} + +static bool bright; +static int defaultBg = 0; +static int defaultFg = 7; + +static void span(const struct Style *prev, const struct Cell *cell) { + struct Style style = cell->style; + if (!prev || memcmp(prev, &style, sizeof(*prev))) { + if (prev) printf("</span>"); + if (style.bg < 0) style.bg = defaultBg; + if (style.fg < 0) style.fg = defaultFg; + if (bright && style.attr & Bold) { + if (style.fg < 8) style.fg += 8; + style.attr ^= Bold; + } + printf( + "<span style=\"%s%s%s\" class=\"bg%u fg%u\">", + (style.attr & Bold ? "font-weight:bold;" : ""), + (style.attr & Italic ? "font-style:italic;" : ""), + (style.attr & Underline ? "text-decoration:underline;" : ""), + (style.attr & Reverse ? style.fg : style.bg), + (style.attr & Reverse ? style.bg : style.fg) + ); + } + switch (cell->ch) { + break; case '&': printf("&"); + break; case '<': printf("<"); + break; case '>': printf(">"); + break; default: printf("%lc", (wint_t)cell->ch); + } +} + +static bool mediaCopy; +static void html(void) { + mediaCopy = true; + if (mode & Cursor) cell(y, x)->style.attr ^= Reverse; + printf( + "<pre style=\"width: %uch;\" class=\"bg%u fg%u\">", + cols, defaultBg, defaultFg + ); + for (uint y = 0; y < rows; ++y) { + for (uint x = 0; x < cols; ++x) { + if (!cell(y, x)->ch) continue; + span(x ? &cell(y, x - 1)->style : NULL, cell(y, x)); + } + printf("</span>\n"); + } + printf("</pre>\n"); + if (mode & Cursor) cell(y, x)->style.attr ^= Reverse; +} + +int main(int argc, char *argv[]) { + setlocale(LC_CTYPE, ""); + + bool debug = false; + bool size = false; + bool hide = false; + + int opt; + while (0 < (opt = getopt(argc, argv, "Bb:df:h:nsw:"))) { + switch (opt) { + break; case 'B': bright = true; + break; case 'b': defaultBg = strtol(optarg, NULL, 0); + break; case 'd': debug = true; + break; case 'f': defaultFg = strtol(optarg, NULL, 0); + break; case 'h': rows = strtoul(optarg, NULL, 0); + break; case 'n': hide = true; + break; case 's': size = true; + break; case 'w': cols = strtoul(optarg, NULL, 0); + break; default: return EX_USAGE; + } + } + + FILE *file = stdin; + if (optind < argc) { + file = fopen(argv[optind], "r"); + if (!file) err(EX_NOINPUT, "%s", argv[optind]); + } + + if (size) { + struct winsize window; + int error = ioctl(STDERR_FILENO, TIOCGWINSZ, &window); + if (error) err(EX_IOERR, "ioctl"); + rows = window.ws_row; + cols = window.ws_col; + } + scroll.bot = rows; + + cells = calloc(rows * cols, sizeof(*cells)); + if (!cells) err(EX_OSERR, "calloc"); + erase(cell(0, 0), cell(rows - 1, cols)); + + wint_t ch; + while (WEOF != (ch = getwc(file))) { + uint prev = state; + update(ch); + if (debug && state != prev && state == Data) html(); + } + if (ferror(file)) err(EX_IOERR, "getwc"); + + if (!mediaCopy) { + if (hide) mode &= ~Cursor; + html(); + } +} |