Rewrote prcontext.py in tcl.

llvm-svn: 17708

llvm/test/Scripts/prcontext.tcl

@@ -0,0 +1,36 @@
+#!/usr/bin/tclsh
+#
+# Usage:
+# prcontext <pattern> <# lines of context>
+# (for platforms that don't have grep -C)
+
+
+#
+# Get the arguments
+#
+set pattern [lindex $argv 0]
+set num [lindex $argv 1]
+
+
+#
+# Get all of the lines in the file.
+#
+set lines [split [read stdin] \n]
+
+set index 0
+foreach line $lines {
+    if { [regexp $pattern $line match matchline] } {
+        if { [ expr [expr $index - $num] < 0 ] } {
+            set bottom 0
+        } else {
+            set bottom [expr $index - $num]
+        }
+        set endLineNum [ expr [expr $index + $num] + 1]
+        while {$bottom < $endLineNum} {
+            set output [lindex $lines $bottom]
+            puts $output
+            set bottom [expr $bottom + 1]
+        }
+    }
+    set index [expr $index + 1]
+}