auto add date

.github/workflows/publish.yml

@@ -16,6 +16,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: quarto-dev/quarto-actions/setup@v2
     - run:
+        python auto_add_date.py posts/*.ipynb
         quarto render
     - uses: actions/upload-pages-artifact@v3
       with:

auto_add_date.py

@@ -0,0 +1,26 @@
+import sys
+import nbformat
+import subprocess as subp
+
+for fn in sys.argv[1:]:
+    with open(fn) as f:
+        nb = nbformat.read(f, as_version=4)
+
+    r = subp.run(
+        ["git", "log", "--follow", "--format=%ad", "--date=short", fn], stdout=subp.PIPE
+    )
+    dates = [x for x in r.stdout.decode().split("\n") if x]
+    date = dates[-1]
+
+    if nb.cells and nb.cells[0].cell_type != "raw":
+        front_matter = f"""
+---
+date: {date}
+---
+"""
+        print(f"adding frontmatter to {fn}\n{front_matter}")
+
+        nb.cells = [nbformat.v4.new_raw_cell(front_matter)] + nb.cells
+
+    with open(fn, "w") as f:
+        nbformat.write(nb, f)

index.qmd

@@ -4,8 +4,8 @@ listing:
   sort: "date desc"
   type: default
   categories: false
-  sort-ui: false
-  filter-ui: false
+  sort-ui: true
+  filter-ui: true
 page-layout: full
 title-block-banner: true
 ---

posts/exceptions.md

@@ -1,3 +1,7 @@
+---
+date : 2020-04-05
+---
+
 # C++ exceptions in high-performance code
 
 Here is a collection of advice on using exceptions in high-performance libraries. There has been a lot of discussion in the Boost community about exceptions lately, since [some people want to](http://open-std.org/JTC1/SC22/WG21/docs/papers/2018/p0709r0.pdf) [improve error reporting in C++](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1095r0.pdf), which led to the development of [Boost.Outcome](https://www.boost.org/doc/libs/1_72_0/libs/outcome/doc/html/index.html) and similar libraries. Here we deal with classic C++ exceptions.