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-rw-r--r--src/libterm/term.c489
1 files changed, 489 insertions, 0 deletions
diff --git a/src/libterm/term.c b/src/libterm/term.c
new file mode 100644
index 0000000..11591fc
--- /dev/null
+++ b/src/libterm/term.c
@@ -0,0 +1,489 @@
+#include "term.h"
+
+#include <signal.h>
+#include <sys/ioctl.h>
+
+struct ExtraInfo
+{
+ char *enteralt;
+ char *exitalt;
+
+ char *entermouse;
+ char *exitmouse;
+};
+
+static
+struct ExtraInfo vt200 =
+{
+ .enteralt = "\e[?1049h",
+ .exitalt = "\e[?1049l",
+
+ .entermouse = "\e[?1049h\e[?1006l",
+ .exitmouse = "\e[?1002l\e[?1006l",
+};
+
+static Term *sigwinchhead;
+
+// -----------------------------------------------------------------------
+// database lookup
+
+static
+char*
+tryinfostr(Term *t, enum unibi_string s)
+{
+ char *val = (char*)unibi_get_str(t->info, s);
+ /* TODO: provide fallbacks */
+ return val;
+}
+
+static
+char*
+guessinfostr(Term *t, enum unibi_string s, char *guess)
+{
+ char *val = (char*)unibi_get_str(t->info, s);
+ if (!val)
+ return guess;
+ return val;
+}
+
+static
+char*
+getinfostr(Term *t, enum unibi_string s)
+{
+ char *val = tryinfostr(t, s);
+ if (!val)
+ panicf("required term info string '%s' missing", unibi_name_str(s));
+
+ return val;
+}
+
+static
+char *
+tryextrastr(Term *t, char *name)
+{
+ const char *nm;
+ size_t max = unibi_count_ext_str(t->info);
+ for (size_t i = 0; i < max; i++) {
+ nm = unibi_get_ext_str_name(t->info, i);
+ if (nm && !strcmp(nm, name)) {
+ return (char *)nm;
+ }
+ }
+ return nil;
+}
+
+static
+char *
+guessextrastr(Term *t, char *name, char *guess)
+{
+ char *s;
+ if ((s = tryextrastr(t, name)))
+ return s;
+
+ return guess;
+}
+
+/* formats escape strings and writes to output */
+static void tfmt(Term *t, char *esc, int n, ...);
+static void tclear(Term *t);
+
+// -----------------------------------------------------------------------
+// exported term methods
+
+static
+char *
+ttmpbuf(Term *t, int len)
+{
+ if (t->tmp.len >= len)
+ return t->tmp.b;
+
+ /* TODO: error handling */
+ return (t->tmp.b = realloc(t->tmp.b, len));
+}
+
+void twrite(Term *t, long len, char *s);
+void tlistensigwinch(Term *t);
+
+Term*
+tmake(void)
+{
+ Term *t;
+
+ t = calloc(1, sizeof(*t));
+
+ /* meta data */
+ t->name = getenv("TERM");
+ t->info = unibi_from_term(t->name);
+ if (!t->info)
+ panicf("could not identify terminal");
+
+ t->fd = 1; // stdout
+ tlistensigwinch(t);
+
+ t->mode.mouse = 0;
+ t->mode.cursorvis = 1;
+ t->mode.altscreen = 0;
+
+ t->cap.colors = unibi_get_num(t->info, unibi_max_colors);
+ t->cap.bce = unibi_get_bool(t->info, unibi_back_color_erase);
+
+ /* initialize root window (get current size)*/
+ struct winsize ws = { 0 };
+ if (ioctl(t->fd, TIOCGWINSZ, &ws) == 1)
+ goto bad;
+
+ t->root = wmake(nil, 0, 0, ws.ws_col, ws.ws_row, 0);
+
+ t->root->curvis = 1;
+ t->root->blink = 0;
+
+ t->pen = (Pen){
+ .state = PenNormal,
+ .col = {.fg = -1, .bg = -1},
+ };
+
+ /* fill in output buffers */
+ t->buf.c = t->buf.b;
+ t->tmp.b = nil;
+ t->tmp.len = 0;
+
+ /* get all term info format strings */
+ t->esc.cup = getinfostr(t, unibi_cursor_address);
+ t->esc.vpa = tryinfostr(t, unibi_row_address);
+ t->esc.hpa = tryinfostr(t, unibi_column_address);
+ t->esc.cuu = getinfostr(t, unibi_parm_up_cursor);
+ t->esc.cuu1 = tryinfostr(t, unibi_cursor_up);
+ t->esc.cud = getinfostr(t, unibi_parm_down_cursor);
+ t->esc.cud1 = tryinfostr(t, unibi_cursor_down);
+ t->esc.cuf = getinfostr(t, unibi_parm_right_cursor);
+ t->esc.cuf1 = tryinfostr(t, unibi_cursor_right);
+ t->esc.cub = getinfostr(t, unibi_parm_left_cursor);
+ t->esc.cub1 = tryinfostr(t, unibi_cursor_left);
+ t->esc.ich = getinfostr(t, unibi_parm_ich);
+ t->esc.ich1 = tryinfostr(t, unibi_insert_character);
+ t->esc.dch = getinfostr(t, unibi_parm_dch);
+ t->esc.dch1 = tryinfostr(t, unibi_delete_character);
+ t->esc.il = getinfostr(t, unibi_parm_insert_line);
+ t->esc.il1 = tryinfostr(t, unibi_insert_line);
+ t->esc.dl = getinfostr(t, unibi_parm_delete_line);
+ t->esc.dl1 = tryinfostr(t, unibi_delete_line);
+ t->esc.ech = getinfostr(t, unibi_erase_chars);
+ t->esc.ed2 = getinfostr(t, unibi_clear_screen);
+ t->esc.stbm = getinfostr(t, unibi_change_scroll_region);
+ t->esc.sgr = getinfostr(t, unibi_set_attributes);
+ t->esc.sgr0 = getinfostr(t, unibi_exit_attribute_mode);
+ t->esc.sgr_i0 = tryinfostr(t, unibi_exit_italics_mode);
+ t->esc.sgr_i1 = tryinfostr(t, unibi_enter_italics_mode);
+ t->esc.sgr_fg = getinfostr(t, unibi_set_a_foreground);
+ t->esc.sgr_bg = getinfostr(t, unibi_set_a_background);
+ t->esc.sm_csr = getinfostr(t, unibi_cursor_normal);
+ t->esc.rm_csr = getinfostr(t, unibi_cursor_invisible);
+
+ /* extensions to terminfo */
+ t->esc.ext.rgbf = guessextrastr(t, "setrgbf", "\x1b[38;2;%p1%d;%p2%d;%p3%dm");
+ t->esc.ext.rgbb = guessextrastr(t, "setrgbb", "\x1b[48;2;%p1%d;%p2%d;%p3%dm");
+
+ return t;
+
+bad:
+ panicf("failed to initialize terminal instance");
+ free(t);
+ return nil;
+}
+
+void
+tfree(Term *t)
+{
+ if (t->mode.mouse)
+ twrite(t, 0, vt200.exitmouse);
+ if (!t->mode.cursorvis)
+ tfmt(t, t->esc.rm_csr, 0);
+ if (t->mode.altscreen)
+ twrite(t, 0, vt200.exitalt);
+
+ tfmt(t, t->esc.sgr0, 0);
+ tclear(t);
+ free(t);
+}
+
+/* handle resize events */
+void
+tresize(Term *t)
+{
+ if (t->fd == -1)
+ return;
+
+ struct winsize ws = { 0 };
+ if (ioctl(t->fd, TIOCGWINSZ, &ws) == 1)
+ return;
+
+ printf("[%d,%d]\n", ws.ws_col, ws.ws_row);
+ if (t->root->w != ws.ws_col || t->root->h != ws.ws_row)
+ wresize(t->root, ws.ws_col, ws.ws_row);
+}
+
+static
+void
+sigwinch(int num)
+{
+ Term *it;
+ for (it = sigwinchhead; it; it = it->link)
+ tresize(it);
+}
+
+void
+tlistensigwinch(Term *t)
+{
+ sigset_t new, old;
+ Term *it;
+
+ sigemptyset(&new);
+ sigaddset(&new, SIGWINCH);
+ sigprocmask(SIG_BLOCK, &new, &old);
+
+ if (!sigwinchhead) {
+ sigaction(SIGWINCH, &(struct sigaction){ .sa_handler = sigwinch }, nil);
+ sigwinchhead = t;
+ } else {
+ it = sigwinchhead;
+ while (it->link)
+ it = it->link;
+ it->link = t;
+ }
+
+ sigprocmask(SIG_SETMASK, &old, nil);
+}
+
+void
+tflush(Term *t)
+{
+ if (t->fd != -1)
+ write(t->fd, t->buf.b, t->buf.c - t->buf.b);
+
+ t->buf.c = t->buf.b;
+}
+
+void
+twrite(Term *t, long len, char *s)
+{
+ int n;
+ if (!len)
+ len = strlen(s);
+
+loop:
+ n = MIN(len, arrend(t->buf.b) - t->buf.c);
+ memcpy(t->buf.c, s, n);
+ t->buf.c += n;
+ len -= n;
+ if (len) {
+ tflush(t);
+ goto loop;
+ }
+}
+
+void
+tsetpen(Term *t, Pen new)
+{
+ int c;
+ ushort ic, in;
+ Pen cur = t->pen;
+ if (!memcmp(&new, &cur, sizeof(new)))
+ return;
+
+ /* attributes */
+ tfmt(t, t->esc.sgr, 9,
+ 0, /* standout */
+ new.state & PenUnderline,
+ new.state & PenReverse,
+ new.state & PenBlink,
+ new.state & PenDim,
+ new.state & PenBold,
+ new.state & PenInvis,
+ 0, /* protect */
+ 0); /* alt */
+
+ ic = cur.state & PenItalic;
+ in = new.state & PenItalic;
+ if (ic & ~in)
+ tfmt(t, t->esc.sgr_i0, 0);
+ else if (~ic & in)
+ tfmt(t, t->esc.sgr_i1, 0);
+
+ /* fg/bg color */
+ /* TODO: add a check for if the terminal supports true color */
+ /* TODO: deal w/ negative indices properly */
+ if (new.state & PenRGB) {
+ tfmt(t, t->esc.ext.rgbf, 3, new.rgb.fg.r, new.rgb.fg.g, new.rgb.fg.b);
+ tfmt(t, t->esc.ext.rgbb, 3, new.rgb.bg.r, new.rgb.bg.g, new.rgb.bg.b);
+ } else {
+ tfmt(t, t->esc.sgr_fg, 1, new.col.fg);
+ tfmt(t, t->esc.sgr_bg, 1, new.col.bg);
+ }
+
+ t->pen = new;
+}
+
+static
+void
+tfmt(Term *t, char *esc, int n, ...)
+{
+ int i;
+ long len;
+ va_list args;
+ unibi_var_t param[9];
+ char buf[64], *c = buf;
+
+ if (!esc)
+ panicf("no terminfo escape string given");
+
+ va_start(args, n);
+ for (i = 0; i < arrlen(param) && i < n; i++) {
+ param[i] = unibi_var_from_num(va_arg(args, int));
+ }
+ va_end(args);
+
+ len = unibi_run(esc, param, c, sizeof(buf));
+ if (len >= arrlen(buf)) {
+ c = ttmpbuf(t, len);
+ unibi_run(esc, param, c, len);
+ }
+
+ twrite(t, len, c);
+}
+
+/* absolute move */
+static
+int
+tgoto(Term *t, int row, int col)
+{
+ if (row != -1 && col != -1)
+ tfmt(t, t->esc.cup, 2, row, col);
+ else if (row != -1) {
+ if (!t->esc.vpa)
+ return 0;
+ tfmt(t, t->esc.vpa, 1, row);
+ } else if (col != -1) {
+ if (col == 0) {
+ twrite(t, 1, "\r");
+ return 1;
+ }
+ if (t->esc.hpa)
+ tfmt(t, t->esc.hpa, 1, col);
+ else if (t->esc.cuf) {
+ twrite(t, 1, "\r");
+ tfmt(t, t->esc.cuf, 1, col);
+ } else
+ return 0;
+ } else
+ return 0; /* unreachable */
+
+ return 1;
+}
+
+/* relative move */
+static
+void
+tjump(Term *t, int down, int right)
+{
+ if (down == 1 && t->esc.cud1)
+ tfmt(t, t->esc.cud1, 0);
+ else if (down == -1 && t->esc.cuu1)
+ tfmt(t, t->esc.cuu1, 0);
+ else if (down > 0)
+ tfmt(t, t->esc.cud, 1, down);
+ else if (down < 0)
+ tfmt(t, t->esc.cuu, 1, -down);
+
+ if (right == 1 && t->esc.cuf1)
+ tfmt(t, t->esc.cuf1, 0);
+ else if (right == -1 && t->esc.cub1)
+ tfmt (t, t->esc.cub1, 0);
+ else if (right > 0)
+ tfmt(t, t->esc.cuf, 1, right);
+ else if( right < 0)
+ tfmt(t, t->esc.cub, 1, -right);
+}
+
+static
+void
+tclear(Term *t)
+{
+ tfmt(t, t->esc.ed2, 0);
+}
+
+void
+tblit(Term *t, Window *win)
+{
+ int r, c, n, j;
+ Row *row;
+ char u[UTFmax+1] = {0};
+
+ j = 0;
+ tgoto(t, win->top, win->left);
+ for (r = 0; r < win->h; r++) {
+ row = win->row + r;
+ if (!row->dirty) {
+ j++;
+ continue;
+ }
+
+ if (j) {
+ tjump(t, j, 0);
+ j = 0;
+ }
+
+ for (c = 0; c < win->w; c++) {
+ tsetpen(t, row->cells[c].pen);
+ n = utf8·runetobyte(u, &row->cells[c].txt);
+ twrite(t, n, u);
+ }
+
+ row->dirty = 0;
+ }
+
+ tflush(t);
+}
+
+// -----------------------------------------------------------------------
+// testing
+
+int
+main()
+{
+ int i;
+ Term *t;
+ Window *win;
+
+ t = tmake();
+ win = t->root;
+ tclear(t);
+
+ win->pen = (Pen){
+ .state = PenNormal,
+ .col = {.fg=-1, .bg=-1},
+ };
+ for (i = 0; i < 2000; i++)
+ wputrune(win, 'a');
+
+ tblit(t, win);
+
+ win->cur.row = 10;
+ win->cur.col = 0;
+
+ win->pen = (Pen){
+ .state=PenNormal|PenRGB,
+ .rgb={.fg={200, 100, 100}, .bg={0, 0, 0} },
+ };
+
+ for (i = 0; i < 500; i++)
+ wputrune(win, 'b');
+
+ tblit(t, win);
+
+ sleep(5);
+ wscroll(win, 10);
+ tblit(t, win);
+ sleep(5);
+
+ tfree(t);
+}
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