tkdiff: init at 5.6

TkDiff is a graphical front end to the diff program
https://tkdiff.sourceforge.io/

pkgs/by-name/tk/tkdiff/189.patch

@@ -0,0 +1,71 @@
+Index: tkdiff
+===================================================================
+diff --git a/tkdiff b/tkdiff
+--- a/tkdiff	(revision 188)
++++ b/tkdiff	(revision 189)
+@@ -111,7 +111,7 @@
+ }
+ 
+ # Determine the name of the temporary directory, the rc file name,
+-# and possible VPATH EnvVar, all of which are platform dependent.
++# NULLdev, and possible VPATH EnvVar, all of which are platform dependent.
+ #
+ # Much MAY likely be overridden by a preference in .tkdiffrc,
+ # EXCEPT (obviously) when no such file actually exists yet
+@@ -126,6 +126,9 @@
+             set opts(tmpdir) C:/temp
+         }
+ 
++        # Reserved filename which is actually a NULL device
++        set opts(NULLdev) "nul"
++
+         # Split up and store a VPATH if it exists
+         if {[info exists ::env(VPATH)]} {
+             set finfo(Vpath) [split $::env(VPATH) ";"]
+@@ -145,6 +148,9 @@
+             set opts(tmpdir) $::env(TMPDIR)
+         }  {set opts(tmpdir) /tmp }
+ 
++        # Reserved filename which is actually a NULL device (Unix-like platforms)
++        set opts(NULLdev) "/dev/null"
++
+         # Split up and store a VPATH if it exists
+         if {[info exists ::env(VPATH)]} {
+             set finfo(Vpath) [split $::env(VPATH) ":"]
+@@ -2106,7 +2112,7 @@
+ #           1  Failed   (PLUS a 'pushed' HARD-error message to the caller)
+ ###############################################################################
+ proc get-file {fn ndx {probe 0}} {
+-    global g finfo
++    global g opts finfo
+ 
+     # Ancestor files are stored into a slightly adjusted array element name 
+     #   N.B> 'ndx' AS PASSED *can* be an EXPRESSION (not just a number): resolve!
+@@ -2121,7 +2127,7 @@
+     } elseif {!$tildechk} {
+         # DO NOT REPORT non-existence if this attempt was ONLY a probe
+         if {$probe} { return 1 } { set MSG "File '$fn' does not exist" }
+-    } elseif {[file isfile $fn]} {
++    } elseif {[file isfile $fn] || $fn == $opts(NULLdev)} {
+         set finfo(${A}lbl,$ndx) [shortNm [set finfo(${A}pth,$ndx) "$fn"]]
+     } else { set MSG "'$fn' exists, but is not a file" }
+ 
+@@ -2857,7 +2863,7 @@
+ # Align various label decorations to the CURRENT input file pairing
+ ###############################################################################
+ proc alignDecor {pairnum} {
+-    global g w finfo
++    global g w opts finfo
+ 
+     # Establish if 3way mode is NOW active and what file indices are in use
+     set g(is3way) [info exists finfo(albl,$pairnum)]
+@@ -2874,7 +2880,8 @@
+             set finfo(lbl,$LR) $finfo(ulbl,$ndx($n))    ;# Override lbl display
+         } else {set finfo(lbl,$LR) $finfo(lbl,$ndx($n))}
+ 
+-        if {![info exists finfo(tmp,$ndx($n))]} {
++        if {![info exists finfo(tmp,$ndx($n))] \
++            && $finfo(pth,$ndx($n)) != $opts(NULLdev)} {
+             #   (N.B> Tip data will ALSO be used by report generation heading)
+             set    g(tooltip,${LR}Label) "{$finfo(pth,$ndx($n))\n"
+             append g(tooltip,${LR}Label) \

pkgs/by-name/tk/tkdiff/package.nix

@@ -0,0 +1,43 @@
+{ diffutils, fetchzip, lib, makeBinaryWrapper, stdenv, tk }:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "tkdiff";
+  version = "5.6";
+
+  src = fetchzip {
+    url = "mirror://sourceforge/tkdiff/tkdiff-${builtins.replaceStrings ["."] ["-"] finalAttrs.version}.zip";
+    hash = "sha256-EpbIdjsejkkTaSpoZRM5AHz0r1Cio+YzRryK0BoghBk=";
+  };
+
+  # fix regression: allow /dev/null again. eg: "tkdiff /dev/null file"
+  # svn diff --git -r188:189 https://svn.code.sf.net/p/tkdiff/code/trunk
+  patches = [ ./189.patch ];
+
+  nativeBuildInputs = [ makeBinaryWrapper ];
+
+  installPhase = ''
+    runHook preInstall
+
+    install -Dm755 -t $out/bin tkdiff
+    wrapProgram $out/bin/tkdiff \
+      --prefix PATH : ${lib.makeBinPath [ diffutils tk ]}
+
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "A graphical front end to the diff program";
+    homepage = "https://tkdiff.sourceforge.io/";
+    license = lib.licenses.gpl2Plus;
+    longDescription = ''
+      TkDiff is a graphical front end to the diff program. It provides a
+      side-by-side view of the differences between two text files, along
+      with several innovative features such as diff bookmarks, a graphical
+      map of differences for quick navigation, and a facility for slicing
+      diff regions to achieve exactly the merge output desired.
+    '';
+    mainProgram = "tkdiff";
+    maintainers = with lib.maintainers; [ robert-manchester ];
+    platforms = tk.meta.platforms;
+  };
+})