From 4f49b16079b27d7ce633619e4cddfdf2bffbc952 Mon Sep 17 00:00:00 2001
From: cashmere <cashmere@autistici.org>
Date: Fri, 4 Sep 2026 09:05:24 +0200
Subject: initial commit

---
 tools/cvs2fossil/lib/id.tcl | 64 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 tools/cvs2fossil/lib/id.tcl

(limited to 'tools/cvs2fossil/lib/id.tcl')

diff --git a/tools/cvs2fossil/lib/id.tcl b/tools/cvs2fossil/lib/id.tcl
new file mode 100644
index 0000000..331f9a6
--- /dev/null
+++ b/tools/cvs2fossil/lib/id.tcl
@@ -0,0 +1,64 @@
+# # ## ### ##### ######## #############
+
+## A simple class for handling an in-memory index mapping from
+## arbitrary strings to a small numeric id. Can be queried in reverse
+## too, returning the string for the id.
+
+## Id's are starting from 1.
+
+# # ## ### ##### ######## #############
+## Requirements.
+
+package require Tcl  ; # Runtime.
+package require snit ; # OO runtime.
+
+# # ## ### ##### ######## #############
+## Implementation.
+
+snit::type ::vc::tools::id {
+    # # ## ### ##### ######## #############
+
+    constructor {} {}
+
+    # # ## ### ##### ######## #############
+    ## Public API.
+    ## - Put data into the index, incl. query for id of key.
+    ## - Lookup data for id.
+
+    method put {key} {
+	if {[info exists mydata($key)]} { return $mydata($key) }
+	incr mycounter
+
+	set mydata($key)   $mycounter
+	set myinvert($mycounter) $key
+
+	return $mycounter
+    }
+
+    # Explicitly load the database with a mapping.
+    method map {id key} {
+	set mydata($key)   $id
+	set myinvert($id) $key
+    }
+
+    method keyof {id} { return $myinvert($id) }
+    method get   {}   { return [array get mydata] }
+
+    # # ## ### ##### ######## #############
+    ## Internal. State.
+
+    variable mydata   -array {} ; # Map data -> id
+    variable myinvert -array {} ; # Map id -> data
+    variable mycounter        0 ; # Counter for id generation.
+
+    # # ## ### ##### ######## #############
+}
+
+namespace eval ::vc::tools {
+    namespace export id
+}
+
+# # ## ### ##### ######## #############
+## Ready.
+
+package provide vc::tools::id 1.0
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