From 9ff7f30cb1e0e743655548c6b10da5ef5641ac00 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Fri, 6 May 2022 05:26:26 -0700
Subject: Toggle highlighting of marker chars.

---
 pw.c | 41 +++++++++++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 6 deletions(-)

(limited to 'pw.c')

diff --git a/pw.c b/pw.c
index 9daaf5e..38d08b4 100644
--- a/pw.c
+++ b/pw.c
@@ -76,7 +76,8 @@ enum status_flags {
   stat_grep = 64,   // grep mode
   stat_force = 128, // force refresh even if clean
   stat_lino = 256,  // render line numbers
-  stat_bkgnd = 512  // running in the background
+  stat_bkgnd = 512, // running in the background
+  stat_hlite = 1024 // running in the background
 };
 
 typedef struct pwstate {
@@ -337,6 +338,29 @@ static void clreol(int nl)
     putchar('\n');
 }
 
+static void hlon(void)
+{
+  printf("\033[7m");
+}
+
+static void hloff(void)
+{
+  printf("\033[m");
+}
+
+#define with_hl(pw, expr) do {                                                \
+  if ((pw)->stat & stat_hlite)                                                \
+    hlon();                                                                   \
+  expr;                                                                       \
+  if ((pw)->stat & stat_hlite)                                                \
+    hloff();                                                                  \
+} while (0)
+
+static void hlchar(pwstate *pw, int ch)
+{
+  with_hl(pw, putchar(ch));
+}
+
 static void drawline(pwstate *pw, const char *line, int lineno)
 {
   const char *oline = line;
@@ -372,7 +396,7 @@ static void drawline(pwstate *pw, const char *line, int lineno)
       len = 0;
     } else if (len - delta <= vsplit2) {
       if (vsplit1) {
-        putchar('|');
+        hlchar(pw, '|');
         delta++;
       }
       fputs(line + delta, stdout);
@@ -382,7 +406,7 @@ static void drawline(pwstate *pw, const char *line, int lineno)
     } else {
       unsigned start = 0;
       if (vsplit1) {
-        putchar('|');
+        hlchar(pw, '|');
         start++;
       }
       for (unsigned i = start; i < vsplit2; i++)
@@ -398,7 +422,7 @@ static void drawline(pwstate *pw, const char *line, int lineno)
     if (pw->hpos || vsplit1 || vsplit2) {
       line += pw->hpos + 1;
       len -= pw->hpos + 1;
-      putchar('>');
+      hlchar(pw, '>');
       columns--;
     }
     if (len < (size_t) columns) {
@@ -407,11 +431,12 @@ static void drawline(pwstate *pw, const char *line, int lineno)
     } else {
       for (int i = 0; i < columns - 1; i++)
         putchar(line[i]);
-      puts("<");
+      hlchar(pw, '<');
+      putchar('\n');
     }
   } else {
     if (endmark)
-      putchar('>');
+      hlchar(pw, '>');
     clreol(1);
   }
 }
@@ -1197,6 +1222,10 @@ int main(int argc, char **argv)
               pw.stat |= stat_force;
             }
             break;
+          case ctrl('i'):
+            pw.stat ^= stat_hlite;
+            pw.stat |= stat_force;
+            break;
           case 'j':
             if (pw.hist > 0) {
               pw.hist--;
-- 
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