2 files changed, 71 insertions, 0 deletions
diff --git a/2024/tcl/04.tcl b/2024/tcl/04.tcl
new file mode 100755
index 0000000..2e1742f
--- /dev/null
+++ b/2024/tcl/04.tcl
@@ -0,0 +1,63 @@
+#!/bin/env tclsh
+
+source lib.tcl
+setup 4
+
+puts {Part 1: XMAS word search count}
+
+set height [llength $input]
+set width [string length [lindex $input 0]]
+set w2 [expr {$height * 2}]
+set w3 [expr {$height * 3}]
+set input [join $input ""]
+
+set xmas_hits 0
+
+for {set i 0} {$i < [string length $input]} {incr i} {
+  set start $xmas_hits
+  if {$width - ($i % $width) > 3 && [sindex $input $i $i+1 $i+2 $i+3] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+  if {$i % $width > 3 && [sindex $input $i $i-1 $i-2 $i-3] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+
+  if {$height - ($i / $width % $height) > 3 && [sindex $input $i $i+$width $i+$w2 $i+$w3] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+  if {$i / $width % $height > 3 && [sindex $input $i $i-$width $i-$w2 $i-$w3] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+
+  # down-right
+  if {$height - ($i / $width % $height) > 3 && $width - ($i % $width) > 3 && [sindex $input $i [expr {$i+$width+1}] [expr {$i+$w2+2}] [expr {$i+$w3+3}]] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+  # down-left
+  if {$height - ($i / $width % $height) > 3 && $i % $width > 3 && [sindex $input $i [expr {$i+$width-1}] [expr {$i+$w2-2}] [expr {$i+$w3-3}]] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+  # up-right
+  if {$i / $width % $height > 3 && $width - ($i % $width) > 3 && [sindex $input $i [expr {$i-$width+1}] [expr {$i-$w2+2}] [expr {$i-$w3+3}]] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+  # up-left
+  if {$i / $width % $height > 3 && $i % $width > 3 && [sindex $input $i [expr {$i-$width-1}] [expr {$i-$w2-2}] [expr {$i-$w3-3}]] == "XMAS"} {
+    puts $i
+    incr xmas_hits
+  }
+}
+
+puts "Count: $xmas_hits"
+
+puts ""
+puts {Part 2: }
+
+puts "2: $"
diff --git a/2024/tcl/lib.tcl b/2024/tcl/lib.tcl
index 698bb9a..2968072 100644
--- a/2024/tcl/lib.tcl
+++ b/2024/tcl/lib.tcl
@@ -39,3 +39,11 @@ proc regroup {pat {var input}} {
   lappend list2 $cur
   set list $list2
 }
+
+proc sindex {str args} {
+  set ret {}
+  foreach arg $args {
+    append ret [string index $str $arg]
+  }
+  return $ret
+}