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From 30a04d9ecb3998953bdbe42e5617d00d6002869b Mon Sep 17 00:00:00 2001
From: Santtu Lakkala <inz@inz.fi>
Date: Wed, 16 Feb 2022 20:34:20 +0200
Subject: [PATCH] Loop through urls on screen and copy to clipboard
Replace url detection heuristics with a DFA, enabling urls that span
multiple lines. Also fix the selection not to use snapping so that urls
are selected exactly.
---
config.def.h | 1 +
st.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++
st.h | 1 +
3 files changed, 95 insertions(+)
diff --git a/config.def.h b/config.def.h
index 91ab8ca..3f365c7 100644
--- a/config.def.h
+++ b/config.def.h
@@ -201,6 +201,7 @@ static Shortcut shortcuts[] = {
{ TERMMOD, XK_Y, selpaste, {.i = 0} },
{ ShiftMask, XK_Insert, selpaste, {.i = 0} },
{ TERMMOD, XK_Num_Lock, numlock, {.i = 0} },
+ { MODKEY, XK_l, copyurl, {.i = 0} },
};
/*
diff --git a/st.c b/st.c
index 51049ba..5b6d919 100644
--- a/st.c
+++ b/st.c
@@ -152,6 +152,11 @@ typedef struct {
int narg; /* nb of args */
} STREscape;
+typedef struct {
+ int state;
+ size_t length;
+} URLdfa;
+
static void execsh(char *, char **);
static void stty(char **);
static void sigchld(int);
@@ -200,6 +205,7 @@ static void tdefutf8(char);
static int32_t tdefcolor(const int *, int *, int);
static void tdeftran(char);
static void tstrsequence(uchar);
+static int daddch(URLdfa *, char);
static void drawregion(int, int, int, int);
@@ -2688,3 +2694,90 @@ redraw(void)
tfulldirt();
draw();
}
+
+int
+daddch(URLdfa *dfa, char c)
+{
+ /* () and [] can appear in urls, but excluding them here will reduce false
+ * positives when figuring out where a given url ends.
+ */
+ static const char URLCHARS[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789-._~:/?#@!$&'*+,;=%";
+ static const char RPFX[] = "//:sptth";
+
+ if (!strchr(URLCHARS, c)) {
+ dfa->length = 0;
+ dfa->state = 0;
+
+ return 0;
+ }
+
+ dfa->length++;
+
+ if (dfa->state == 2 && c == '/') {
+ dfa->state = 0;
+ } else if (dfa->state == 3 && c == 'p') {
+ dfa->state++;
+ } else if (c != RPFX[dfa->state]) {
+ dfa->state = 0;
+ return 0;
+ }
+
+ if (dfa->state++ == 7) {
+ dfa->state = 0;
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
+** Select and copy the previous url on screen (do nothing if there's no url).
+*/
+void
+copyurl(const Arg *arg) {
+ int row = 0, /* row of current URL */
+ col = 0, /* column of current URL start */
+ colend = 0, /* column of last occurrence */
+ passes = 0; /* how many rows have been scanned */
+
+ const char *c = NULL,
+ *match = NULL;
+ URLdfa dfa = { 0 };
+
+ row = (sel.ob.x >= 0 && sel.nb.y > 0) ? sel.nb.y : term.bot;
+ LIMIT(row, term.top, term.bot);
+
+ colend = (sel.ob.x >= 0 && sel.nb.y > 0) ? sel.nb.x : term.col;
+ LIMIT(colend, 0, term.col);
+
+ /*
+ ** Scan from (term.row - 1,term.col - 1) to (0,0) and find
+ ** next occurrance of a URL
+ */
+ for (passes = 0; passes < term.row; passes++) {
+ /* Read in each column of every row until
+ ** we hit previous occurrence of URL
+ */
+ for (col = colend; col--;)
+ if (daddch(&dfa, term.line[row][col].u < 128 ? term.line[row][col].u : ' '))
+ break;
+
+ if (col >= 0)
+ break;
+
+ if (--row < 0)
+ row = term.row - 1;
+
+ colend = term.col;
+ }
+
+ if (passes < term.row) {
+ selstart(col, row, 0);
+ selextend((col + dfa.length - 1) % term.col, row + (col + dfa.length - 1) / term.col, SEL_REGULAR, 0);
+ selextend((col + dfa.length - 1) % term.col, row + (col + dfa.length - 1) / term.col, SEL_REGULAR, 1);
+ xsetsel(getsel());
+ xclipcopy();
+ }
+}
diff --git a/st.h b/st.h
index 519b9bd..0458005 100644
--- a/st.h
+++ b/st.h
@@ -85,6 +85,7 @@ void printscreen(const Arg *);
void printsel(const Arg *);
void sendbreak(const Arg *);
void toggleprinter(const Arg *);
+void copyurl(const Arg *);
int tattrset(int);
void tnew(int, int);
--
2.32.0
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