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From d5b492049f48dc411b0dd7dc01a403304c20438d Mon Sep 17 00:00:00 2001
From: Jishnu Sen <jishnu1@gmail.com>
Date: Sun, 7 Apr 2024 22:54:46 -0700
Subject: [PATCH] Highlight URLs with control and follow with click
---
config.def.h | 11 +++++++
st.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++
st.h | 9 ++++++
x.c | 24 +++++++++++++-
4 files changed, 132 insertions(+), 1 deletion(-)
diff --git a/config.def.h b/config.def.h
index 91ab8ca..4961830 100644
--- a/config.def.h
+++ b/config.def.h
@@ -472,3 +472,14 @@ static char ascii_printable[] =
" !\"#$%&'()*+,-./0123456789:;<=>?"
"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
"`abcdefghijklmnopqrstuvwxyz{|}~";
+
+/*
+ * Open urls starting with urlprefixes, contatining urlchars
+ * by passing as ARG1 to urlhandler.
+ */
+char* urlhandler = "xdg-open";
+char urlchars[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789-._~:/?#@!$&'*+,;=%";
+char* urlprefixes[] = {"http://", "https://", NULL};
diff --git a/st.c b/st.c
index 51049ba..8f2156c 100644
--- a/st.c
+++ b/st.c
@@ -643,6 +643,95 @@ getsel(void)
return str;
}
+char *
+strstrany(char* s, char** strs) {
+ char *match;
+ for (int i = 0; strs[i]; i++) {
+ if ((match = strstr(s, strs[i]))) {
+ return match;
+ }
+ }
+ return NULL;
+}
+
+void
+highlighturls(void)
+{
+ char *match;
+ char *linestr = calloc(sizeof(char), term.col+1); /* assume ascii */
+ for (int i = term.top; i < term.bot; i++) {
+ int url_start = -1;
+ for (int j = 0; j < term.col; j++) {
+ if (term.line[i][j].u < 127) {
+ linestr[j] = term.line[i][j].u;
+ }
+ linestr[term.col] = '\0';
+ }
+ while ((match = strstrany(linestr + url_start + 1, urlprefixes))) {
+ url_start = match - linestr;
+ for (int c = url_start; c < term.col && strchr(urlchars, linestr[c]); c++) {
+ term.line[i][c].mode |= ATTR_URL;
+ tsetdirt(i, c);
+ }
+ }
+ }
+ free(linestr);
+}
+
+void
+unhighlighturls(void)
+{
+ for (int i = term.top; i < term.bot; i++) {
+ for (int j = 0; j < term.col; j++) {
+ Glyph* g = &term.line[i][j];
+ if (g->mode & ATTR_URL) {
+ g->mode &= ~ATTR_URL;
+ tsetdirt(i, j);
+ }
+ }
+ }
+ return;
+}
+
+void
+followurl(int x, int y) {
+ char *linestr = calloc(sizeof(char), term.col+1); /* assume ascii */
+ char *match;
+ for (int i = 0; i < term.col; i++) {
+ if (term.line[x][i].u < 127) {
+ linestr[i] = term.line[x][i].u;
+ }
+ linestr[term.col] = '\0';
+ }
+ int url_start = -1;
+ while ((match = strstrany(linestr + url_start + 1, urlprefixes))) {
+ url_start = match - linestr;
+ int url_end = url_start;
+ for (int c = url_start; c < term.col && strchr(urlchars, linestr[c]); c++) {
+ url_end++;
+ }
+ if (url_start <= y && y < url_end) {
+ linestr[url_end] = '\0';
+ break;
+ }
+ }
+ if (url_start == -1) {
+ free(linestr);
+ return;
+ }
+
+ pid_t chpid;
+ if ((chpid = fork()) == 0) {
+ if (fork() == 0)
+ execlp(urlhandler, urlhandler, linestr + url_start, NULL);
+ exit(1);
+ }
+ if (chpid > 0)
+ waitpid(chpid, NULL, 0);
+ free(linestr);
+ unhighlighturls();
+}
+
void
selclear(void)
{
diff --git a/st.h b/st.h
index 519b9bd..354e7f9 100644
--- a/st.h
+++ b/st.h
@@ -34,6 +34,7 @@ enum glyph_attribute {
ATTR_WIDE = 1 << 9,
ATTR_WDUMMY = 1 << 10,
ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
+ ATTR_URL = 1 << 14,
};
enum selection_mode {
@@ -105,6 +106,10 @@ void selextend(int, int, int, int);
int selected(int, int);
char *getsel(void);
+void highlighturls(void);
+void unhighlighturls(void);
+void followurl(int, int);
+
size_t utf8encode(Rune, char *);
void *xmalloc(size_t);
@@ -126,3 +131,7 @@ extern unsigned int tabspaces;
extern unsigned int defaultfg;
extern unsigned int defaultbg;
extern unsigned int defaultcs;
+extern char *urlhandler;
+extern char urlchars[];
+extern char *urlprefixes[];
+extern int nurlprefixes;
diff --git a/x.c b/x.c
index 8a16faa..13f68e4 100644
--- a/x.c
+++ b/x.c
@@ -191,6 +191,7 @@ static void usage(void);
static void (*handler[LASTEvent])(XEvent *) = {
[KeyPress] = kpress,
+ [KeyRelease] = kpress,
[ClientMessage] = cmessage,
[ConfigureNotify] = resize,
[VisibilityNotify] = visibility,
@@ -445,6 +446,15 @@ mouseaction(XEvent *e, uint release)
/* ignore Button<N>mask for Button<N> - it's set on release */
uint state = e->xbutton.state & ~buttonmask(e->xbutton.button);
+ if (release == 0 &&
+ e->xbutton.button == Button1 &&
+ (match(ControlMask, state) ||
+ match(ControlMask, state & ~forcemousemod))) {
+ followurl(evrow(e), evcol(e));
+ return 1;
+ }
+
+
for (ms = mshortcuts; ms < mshortcuts + LEN(mshortcuts); ms++) {
if (ms->release == release &&
ms->button == e->xbutton.button &&
@@ -1476,7 +1486,7 @@ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, i
XftDrawGlyphFontSpec(xw.draw, fg, specs, len);
/* Render underline and strikethrough. */
- if (base.mode & ATTR_UNDERLINE) {
+ if (base.mode & ATTR_UNDERLINE || base.mode & ATTR_URL) {
XftDrawRect(xw.draw, fg, winx, winy + dc.font.ascent + 1,
width, 1);
}
@@ -1831,6 +1841,18 @@ kpress(XEvent *ev)
len = XmbLookupString(xw.ime.xic, e, buf, sizeof buf, &ksym, &status);
else
len = XLookupString(e, buf, sizeof buf, &ksym, NULL);
+
+ /* 0. highlight URLs when control held */
+ if (ksym == XK_Control_L) {
+ highlighturls();
+ } else if (ev->type == KeyRelease && e->keycode == XKeysymToKeycode(e->display, XK_Control_L)) {
+ unhighlighturls();
+ }
+
+ /* KeyRelease not relevant to shortcuts */
+ if (ev->type == KeyRelease)
+ return;
+
/* 1. shortcuts */
for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
if (ksym == bp->keysym && match(bp->mod, e->state)) {
--
2.44.0
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