5 files changed, 39 insertions, 13 deletions
diff --git a/2024/tcl/01.tcl b/2024/tcl/01.tcl
index 2248e11..bf7e82f 100755
--- a/2024/tcl/01.tcl
+++ b/2024/tcl/01.tcl
@@ -5,7 +5,7 @@ setup 1
 
 puts {Part 1: Find the sum of distances between pairs of numbers with the same ordinal in each list.}
 
-while {[gets $input line] != -1} {
+foreach line $input {
   lassign $line ln rn
 
   lappend left_nums $ln
@@ -14,8 +14,6 @@ while {[gets $input line] != -1} {
   dict incr right_num_counts $rn
 }
 
-close $input
-
 set left_nums [lsort -integer $left_nums]
 set right_nums [lsort -integer $right_nums]
 
diff --git a/2024/tcl/02.tcl b/2024/tcl/02.tcl
index dac290e..8cc14f3 100755
--- a/2024/tcl/02.tcl
+++ b/2024/tcl/02.tcl
@@ -22,7 +22,7 @@ proc row_errs {row} {
   return $row_errs
 }
 
-while {[gets $input report] != -1} {
+foreach report $input {
   if ![row_errs $report] { incr safe_count; continue }
   # naive, but handles a case like [1 4 2 3] where removing 2 makes it
   # safe but an iterative approach only trips on [2]. backtracking
@@ -37,8 +37,6 @@ while {[gets $input report] != -1} {
 
 incr dampened_safe_count $safe_count
 
-close $input
-
 puts "Safe sequence count: $safe_count"
 
 puts ""
diff --git a/2024/tcl/03.tcl b/2024/tcl/03.tcl
index d1ff7c9..7f29b9a 100755
--- a/2024/tcl/03.tcl
+++ b/2024/tcl/03.tcl
@@ -1,14 +1,14 @@
 #!/bin/env tclsh
 
 source lib.tcl
-setup 3
+setup 3 data
 
 puts {Part 1: Sum of mul(x,y) calls...}
 
 set mulsum 0
 set mulsum_cf 0
 set cf 1
-foreach {inst a b} [regexp -all -inline {do\(\)|don't\(\)|mul\((\d+),(\d+)\)} [read $input]] {
+foreach {inst a b} [regexp -all -inline {do\(\)|don't\(\)|mul\((\d+),(\d+)\)} $input] {
   switch -- [string range $inst 0 2] {
     mul {
       set inc [expr {$a * $b}]
@@ -26,8 +26,6 @@ foreach {inst a b} [regexp -all -inline {do\(\)|don't\(\)|mul\((\d+),(\d+)\)} [r
   }
 }
 
-close $input
-
 puts "Sum: $mulsum"
 
 puts ""
diff --git a/2024/tcl/lib.tcl b/2024/tcl/lib.tcl
index d816a25..698bb9a 100644
--- a/2024/tcl/lib.tcl
+++ b/2024/tcl/lib.tcl
@@ -1,9 +1,41 @@
-proc setup {n} {
+proc setup {n {mode lines}} {
   puts "Advent of Code 2024 day $n Solution"
   puts "<https://adventofcode.com/2024/day/$n>"
   puts ""
 
   set n [string range 0$n end-1 end]
   upvar input input
-  set input [open input.$n.txt]
+  set fd [open input.$n.txt]
+
+  switch -- $mode {
+    lines {
+      set input [split [string trim [read $fd]] "\r\n"]
+      close $fd
+    }
+    data {
+      set input [read $fd]
+      close $fd
+    }
+    fd {
+      set input $fd
+    }
+  }
+}
+
+proc regroup {pat {var input}} {
+  upvar $var list
+  set list2 {}
+  set cur {}
+  foreach el $list {
+    if {[string match $pat $el]} {
+      if {$cur != {}} {
+        lappend list2 $cur
+        set cur {}
+      }
+    } else {
+      lappend cur $el
+    }
+  }
+  lappend list2 $cur
+  set list $list2
 }
diff --git a/2024/tcl/templ.tcl b/2024/tcl/templ.tcl
index e040b2f..51a96ff 100755
--- a/2024/tcl/templ.tcl
+++ b/2024/tcl/templ.tcl
@@ -5,7 +5,7 @@ setup ?
 
 puts {Part 1: }
 
-while {[gets $input line] != -1} {
+foreach line $input {
 }
 
 close $input