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	st-copyurl-multiline-20220221-0.8.5.diff (4012B)
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	1 From 30a04d9ecb3998953bdbe42e5617d00d6002869b Mon Sep 17 00:00:00 2001
	2 From: Santtu Lakkala <[email protected]>
	3 Date: Wed, 16 Feb 2022 20:34:20 +0200
	4 Subject: [PATCH] Loop through urls on screen and copy to clipboard
	5
	6 Replace url detection heuristics with a DFA, enabling urls that span
	7 multiple lines. Also fix the selection not to use snapping so that urls
	8 are selected exactly.
	9 ---
	10 config.def.h \| 1 +
	11 st.c \| 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++
	12 st.h \| 1 +
	13 3 files changed, 95 insertions(+)
	14
	15 diff --git a/config.def.h b/config.def.h
	16 index 91ab8ca..3f365c7 100644
	17 --- a/config.def.h
	18 +++ b/config.def.h
	19 @@ -201,6 +201,7 @@ static Shortcut shortcuts[] = {
	20 { TERMMOD, XK_Y, selpaste, {.i = …
	21 { ShiftMask, XK_Insert, selpaste, {.i = …
	22 { TERMMOD, XK_Num_Lock, numlock, {.i = …
	23 + { MODKEY, XK_l, copyurl, {.i = …
	24 };
	25
	26 /*
	27 diff --git a/st.c b/st.c
	28 index 51049ba..5b6d919 100644
	29 --- a/st.c
	30 +++ b/st.c
	31 @@ -152,6 +152,11 @@ typedef struct {
	32 int narg; /* nb of args */
	33 } STREscape;
	34
	35 +typedef struct {
	36 + int state;
	37 + size_t length;
	38 +} URLdfa;
	39 +
	40 static void execsh(char , char *);
	41 static void stty(char **);
	42 static void sigchld(int);
	43 @@ -200,6 +205,7 @@ static void tdefutf8(char);
	44 static int32_t tdefcolor(const int , int , int);
	45 static void tdeftran(char);
	46 static void tstrsequence(uchar);
	47 +static int daddch(URLdfa *, char);
	48
	49 static void drawregion(int, int, int, int);
	50
	51 @@ -2688,3 +2694,90 @@ redraw(void)
	52 tfulldirt();
	53 draw();
	54 }
	55 +
	56 +int
	57 +daddch(URLdfa *dfa, char c)
	58 +{
	59 + /* () and [] can appear in urls, but excluding them here will r…
	60 + * positives when figuring out where a given url ends.
	61 + */
	62 + static const char URLCHARS[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	63 + "abcdefghijklmnopqrstuvwxyz"
	64 + "0123456789-._~:/?#@!$&'*+,;=%";
	65 + static const char RPFX[] = "//:sptth";
	66 +
	67 + if (!strchr(URLCHARS, c)) {
	68 + dfa->length = 0;
	69 + dfa->state = 0;
	70 +
	71 + return 0;
	72 + }
	73 +
	74 + dfa->length++;
	75 +
	76 + if (dfa->state == 2 && c == '/') {
	77 + dfa->state = 0;
	78 + } else if (dfa->state == 3 && c == 'p') {
	79 + dfa->state++;
	80 + } else if (c != RPFX[dfa->state]) {
	81 + dfa->state = 0;
	82 + return 0;
	83 + }
	84 +
	85 + if (dfa->state++ == 7) {
	86 + dfa->state = 0;
	87 + return 1;
	88 + }
	89 +
	90 + return 0;
	91 +}
	92 +
	93 +/*
	94 +** Select and copy the previous url on screen (do nothing if there's no…
	95 +*/
	96 +void
	97 +copyurl(const Arg *arg) {
	98 + int row = 0, /* row of current URL */
	99 + col = 0, /* column of current URL start */
	100 + colend = 0, /* column of last occurrence */
	101 + passes = 0; /* how many rows have been scanned */
	102 +
	103 + const char *c = NULL,
	104 + *match = NULL;
	105 + URLdfa dfa = { 0 };
	106 +
	107 + row = (sel.ob.x >= 0 && sel.nb.y > 0) ? sel.nb.y : term.bot;
	108 + LIMIT(row, term.top, term.bot);
	109 +
	110 + colend = (sel.ob.x >= 0 && sel.nb.y > 0) ? sel.nb.x : term.col;
	111 + LIMIT(colend, 0, term.col);
	112 +
	113 + /*
	114 + ** Scan from (term.row - 1,term.col - 1) to (0,0) and find
	115 + ** next occurrance of a URL
	116 + */
	117 + for (passes = 0; passes < term.row; passes++) {
	118 + /* Read in each column of every row until
	119 + ** we hit previous occurrence of URL
	120 + */
	121 + for (col = colend; col--;)
	122 + if (daddch(&dfa, term.line[row][col].u < 128 ? …
	123 + break;
	124 +
	125 + if (col >= 0)
	126 + break;
	127 +
	128 + if (--row < 0)
	129 + row = term.row - 1;
	130 +
	131 + colend = term.col;
	132 + }
	133 +
	134 + if (passes < term.row) {
	135 + selstart(col, row, 0);
	136 + selextend((col + dfa.length - 1) % term.col, row + (col…
	137 + selextend((col + dfa.length - 1) % term.col, row + (col…
	138 + xsetsel(getsel());
	139 + xclipcopy();
	140 + }
	141 +}
	142 diff --git a/st.h b/st.h
	143 index 519b9bd..0458005 100644
	144 --- a/st.h
	145 +++ b/st.h
	146 @@ -85,6 +85,7 @@ void printscreen(const Arg *);
	147 void printsel(const Arg *);
	148 void sendbreak(const Arg *);
	149 void toggleprinter(const Arg *);
	150 +void copyurl(const Arg *);
	151
	152 int tattrset(int);
	153 void tnew(int, int);
	154 --
	155 2.32.0
	156