fix: get time and git revision from nix typst environment

.rev

@@ -0,0 +1 @@
+UNSTABLE_DO_NOT_USE

cv.typ

@@ -76,10 +76,6 @@
   Nix and NixOS, Docker and NixOS based service deployment and system administration.
 ]
 
-#cv-line[Other][
-  Git and Mercurial Version Control.
-]
-
 = Papers
 
 == Preprints

flake.nix

@@ -54,11 +54,11 @@
               dest = "icons";
               src = "${inputs.font-awesome}/svgs/regular";
             }
+            {
+              src = ./.rev;
+              dest = ".rev";
+            }
           ];
-
-          XDG_CACHE_HOME = typstPackagesCache;
-
-          SOURCE_DATE_EPOCH = builtins.toString self.lastModified;
         };
 
         typstPackagesSrc = "${inputs.typst-packages}/packages";
@@ -79,6 +79,18 @@
           commonArgs
           // {
             inherit src;
+
+            XDG_CACHE_HOME = typstPackagesCache;
+
+            SOURCE_DATE_EPOCH = builtins.toString self.lastModified;
+
+            preBuild =
+              if (self ? rev) then
+                ''
+                  echo ${self.rev} >> .rev
+                ''
+              else
+                "";
           }
         );
 
@@ -88,6 +100,18 @@
           commonArgs
           // {
             inherit src;
+
+            XDG_CACHE_HOME = typstPackagesCache;
+
+            SOURCE_DATE_EPOCH = builtins.toString self.lastModified;
+
+            preBuild =
+              if (self ? rev) then
+                ''
+                  echo ${self.rev} >> .rev
+                ''
+              else
+                "";
           }
         );
 

template.typ

@@ -1,5 +1,7 @@
 #import "@preview/fontawesome:0.5.0": *
 
+#let git_rev = read("./.rev", encoding: "utf8")
+
 #let _cv-line(left, right, ..args) = {
   set block(below: 0pt)
   table(
@@ -144,6 +146,8 @@
     #v(1fr, weak: false)
     #name\
     #datetime.today().display("[month repr:long] [day], [year]")
+
+    #text(size: 8pt)[Built from revision #git_rev]
   ]
 ]