{ depot, pkgs, lib, ... }:
let
bins = depot.nix.getBins pkgs.lowdown [ "lowdown" ]
// depot.nix.getBins pkgs.cdb [ "cdbget" "cdbmake" "cdbdump" ]
// depot.nix.getBins pkgs.coreutils [ "mv" "cat" "printf" "test" ]
// depot.nix.getBins pkgs.s6-networking [ "s6-tcpserver" ]
// depot.nix.getBins pkgs.time [ "time" ]
;
# /
# TODO: use
toplevel = [
{
route = [ "notes" ];
name = "Notes";
page = { cssFile }: router cssFile;
}
{
route = [ "projects" ];
name = "Projects";
# page = projects;
}
];
# /notes/*
notes = [
{
route = [ "notes" "an-idealized-conflang" ];
name = "An Idealized Configuration Language";
page = { cssFile }: markdownToHtml {
name = "an-idealized-conflang";
markdown = ./notes/an-idealized-conflang.md;
inherit cssFile;
};
}
{
route = [ "notes" "rust-string-conversions" ];
name = "Converting between different String types in Rust";
page = { cssFile }: markdownToHtml {
name = "rust-string-conversions";
markdown = ./notes/rust-string-conversions.md;
inherit cssFile;
};
}
{
route = [ "notes" "preventing-oom" ];
name = "Preventing out-of-memory (OOM) errors on Linux";
page = { cssFile }: markdownToHtml {
name = "preventing-oom";
markdown = ./notes/preventing-oom.md;
inherit cssFile;
};
}
];
projects = [
{
name = "lorri";
description = "<code>nix-shell</code> replacement for projects";
link = "https://github.com/nix-community/lorri";
}
{
name = "netencode";
description = ''A human-readble nested data exchange format inspired by <a href="https://en.wikipedia.org/wiki/Netstring">netstrings</a> and <a href="https://en.wikipedia.org/wiki/Bencode">bencode</a>.'';
link = depotCgitLink { relativePath = "users/Profpatsch/netencode/README.md"; };
}
{
name = "yarn2nix";
description = ''nix dependency generator for the <a href="https://yarnpkg.com/"><code>yarn</code> Javascript package manager</a>'';
link = "https://github.com/Profpatsch/yarn2nix";
}
];
posts = [
{
date = "2017-05-04";
title = "Ligature Emulation in Emacs";
subtitle = "It’s not pretty, but the results are";
description = "How to set up ligatures using <code>prettify-symbols-mode</code> and the Hasklig/FiraCode fonts.";
page = { cssFile }: markdownToHtml {
name = "2017-05-04-ligature-emluation-in-emacs";
markdown = ./posts/2017-05-04-ligature-emulation-in-emacs.md;
inherit cssFile;
};
route = [ "posts" "2017-05-04-ligature-emluation-in-emacs" ];
tags = [ "emacs" ];
}
];
# convert a markdown file to html via lowdown
markdownToHtml =
{ name
, # the file to convert
markdown
, # css file to add to the final result, as { route }
cssFile
}:
depot.nix.runExecline "${name}.html" { } ([
"importas"
"out"
"out"
(depot.users.Profpatsch.lib.debugExec "")
bins.lowdown
"-s"
"-Thtml"
] ++
(lib.optional (cssFile != null) ([ "-M" "css=${mkRoute cssFile.route}" ]))
++ [
"-o"
"$out"
markdown
]);
# takes a { route … } attrset and converts the route lists to an absolute path
fullRoute = attrs: lib.pipe attrs [
(map (x@{ route, ... }: x // { route = mkRoute route; }))
];
# a cdb from route to a netencoded version of data for each route
router = cssFile: lib.pipe (notes ++ posts) [
(map (r: with depot.users.Profpatsch.lens;
lib.pipe r [
(over (field "route") mkRoute)
(over (field "page") (_ { inherit cssFile; }))
]))
(map (x: {
name = x.route;
value = depot.users.Profpatsch.netencode.gen.dwim x;
}))
lib.listToAttrs
(cdbMake "router")
];
# Create a link to the given source file/directory, given the relative path in the depot repo.
# Checks that the file exists at evaluation time.
depotCgitLink =
{
# relative path from the depot root (without leading /).
relativePath
}:
assert
(lib.assertMsg
(builtins.pathExists (depot.path.origSrc + "/${relativePath}"))
"depotCgitLink: path /${relativePath} does not exist in depot, and depot.path was ${toString depot.path}");
"https://code.tvl.fyi/tree/${relativePath}";
# look up a route by path ($1)
router-lookup = cssFile: depot.nix.writeExecline "router-lookup" { readNArgs = 1; } [
cdbLookup
(router cssFile)
"$1"
];
runExeclineStdout = name: args: cmd: depot.nix.runExecline name args ([
"importas"
"-ui"
"out"
"out"
"redirfd"
"-w"
"1"
"$out"
] ++ cmd);
notes-index-html =
let o = fullRoute notes;
in ''
<ul>
${scope o (o: ''
<li><a href="${str o.route}">${esc o.name}</a></li>
'')}
</ul>
'';
notes-index = pkgs.writeText "notes-index.html" notes-index-html;
# A simple mustache-inspired string interpolation combinator
# that takes an object and a template (a function from o to string)
# and returns a string.
scope = o: tpl:
if builtins.typeOf o == "list" then
lib.concatMapStringsSep "\n" tpl o
else if builtins.typeOf o == "set" then
tpl o
else throw "${lib.generators.toPretty {} o} not allowed in template";
# string-escape html (TODO)
str = s: s;
# html-escape (TODO)
esc = s: s;
html = s: s;
projects-index-html =
let o = projects;
in ''
<dl>
${scope o (o: ''
<dt><a href="${str o.link}">${esc o.name}</a></dt>
<dd>${html o.description}</dd>
'')}
</dl>
'';
projects-index = pkgs.writeText "projects-index.html" projects-index-html;
posts-index-html =
let o = fullRoute posts;
in ''
<dl>
${scope o (o: ''
<dt>${str o.date} <a href="${str o.route}">${esc o.title}</a></dt>
<dd>${html o.description}</dd>
'')}
</dl>
'';
posts-index = pkgs.writeText "projects-index.html" posts-index-html;
arglibNetencode = val: depot.nix.writeExecline "arglib-netencode" { } [
"export"
"ARGLIB_NETENCODE"
(depot.users.Profpatsch.netencode.gen.dwim val)
"$@"
];
# A simple http server that serves the site. Yes, it’s horrible.
site-server = { cssFile, port }: depot.nix.writeExecline "blog-server" { } [
(depot.users.Profpatsch.lib.runInEmptyEnv [ "PATH" ])
bins.s6-tcpserver
"127.0.0.1"
port
bins.time
"--format=time: %es"
"--"
runOr
return400
"pipeline"
[
(arglibNetencode {
what = "request";
})
depot.users.Profpatsch.read-http
]
depot.users.Profpatsch.netencode.record-splice-env
runOr
return500
"importas"
"-i"
"path"
"path"
"if"
[ depot.tools.eprintf "GET \${path}\n" ]
runOr
return404
"backtick"
"-ni"
"TEMPLATE_DATA"
[
# TODO: factor this out of here, this is routing not serving
"ifelse"
[ bins.test "$path" "=" "/notes" ]
[
"export"
"content-type"
"text/html"
"export"
"serve-file"
notes-index
depot.users.Profpatsch.netencode.env-splice-record
]
"ifelse"
[ bins.test "$path" "=" "/projects" ]
[
"export"
"content-type"
"text/html"
"export"
"serve-file"
projects-index
depot.users.Profpatsch.netencode.env-splice-record
]
"ifelse"
[ bins.test "$path" "=" "/posts" ]
[
"export"
"content-type"
"text/html"
"export"
"serve-file"
posts-index
depot.users.Profpatsch.netencode.env-splice-record
]
# TODO: ignore potential query arguments. See 404 message
"pipeline"
[ (router-lookup cssFile) "$path" ]
depot.users.Profpatsch.netencode.record-splice-env
"importas"
"-ui"
"page"
"page"
"export"
"content-type"
"text/html"
"export"
"serve-file"
"$page"
depot.users.Profpatsch.netencode.env-splice-record
]
runOr
return500
"if"
[
"pipeline"
[
bins.printf
''
HTTP/1.1 200 OK
Content-Type: {{{content-type}}}; charset=UTF-8
Connection: close
''
]
depot.users.Profpatsch.netencode.netencode-mustache
]
"pipeline"
[ "importas" "t" "TEMPLATE_DATA" bins.printf "%s" "$t" ]
depot.users.Profpatsch.netencode.record-splice-env
"importas"
"-ui"
"serve-file"
"serve-file"
bins.cat
"$serve-file"
];
# run argv or $1 if argv returns a failure status code.
runOr = depot.nix.writeExecline "run-or" { readNArgs = 1; } [
"foreground"
[ "$@" ]
"importas"
"?"
"?"
"ifelse"
[ bins.test "$?" "-eq" "0" ]
[ ]
"if"
[ depot.tools.eprintf "runOr: exited \${?}, running \${1}\n" ]
"$1"
];
return400 = depot.nix.writeExecline "return400" { } [
bins.printf
"%s"
''
HTTP/1.1 400 Bad Request
Content-Type: text/plain; charset=UTF-8
Connection: close
''
];
return404 = depot.nix.writeExecline "return404" { } [
bins.printf
"%s"
''
HTTP/1.1 404 Not Found
Content-Type: text/plain; charset=UTF-8
Connection: close
This page doesn’t exist! Query arguments are not handled at the moment.
''
];
return500 = depot.nix.writeExecline "return500" { } [
bins.printf
"%s"
''
HTTP/1.1 500 Internal Server Error
Content-Type: text/plain; charset=UTF-8
Connection: close
Encountered an internal server error. Please try again.
''
];
capture-stdin = depot.nix.writers.rustSimple
{
name = "capture-stdin";
dependencies = [ depot.users.Profpatsch.execline.exec-helpers ];
} ''
extern crate exec_helpers;
use std::io::Read;
fn main() {
let (args, prog) = exec_helpers::args_for_exec("capture-stdin", 1);
let valname = &args[1];
let mut v : Vec<u8> = vec![];
std::io::stdin().lock().read_to_end(&mut v).unwrap();
exec_helpers::exec_into_args("capture-stdin", prog, vec![(valname, v)]);
}
'';
# go from a list of path elements to an absolute route string
mkRoute = route: "/" + lib.concatMapStringsSep "/" urlencodeAscii route;
# urlencodes, but only ASCII characters
# https://en.wikipedia.org/wiki/Percent-encoding
urlencodeAscii = urlPiece:
let
raw = [ "!" "#" "$" "%" "&" "'" "(" ")" "*" "+" "," "/" ":" ";" "=" "?" "@" "[" "]" ];
enc = [ "%21" "%23" "%24" "%25" "%26" "%27" "%28" "%29" "%2A" "%2B" "%2C" "%2F" "%3A" "%3B" "%3D" "%3F" "%40" "%5B" "%5D" ];
rest = [ "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z" "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z" "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "-" "_" "." "~" ];
in
assert lib.assertMsg (lib.all (c: builtins.elem c (raw ++ rest)) (lib.stringToCharacters urlPiece))
"urlencodeAscii: the urlPiece must only contain valid url ASCII characters, was: ${urlPiece}";
builtins.replaceStrings raw enc urlPiece;
# create a cdb record entry, as required by the cdbmake tool
cdbRecord = key: val:
"+${toString (builtins.stringLength key)},${toString (builtins.stringLength val)}:"
+ "${key}->${val}\n";
# create a full cdbmake input from an attribute set of keys to values (strings)
cdbRecords =
with depot.nix.yants;
defun [ (attrs (either drv string)) string ]
(attrs:
(lib.concatStrings (lib.mapAttrsToList cdbRecord attrs)) + "\n");
# run cdbmake on a list of key/value pairs (strings
cdbMake = name: attrs: depot.nix.runExecline "${name}.cdb"
{
stdin = cdbRecords attrs;
} [
"importas"
"out"
"out"
depot.users.Profpatsch.lib.eprint-stdin
"if"
[ bins.cdbmake "db" "tmp" ]
bins.mv
"db"
"$out"
];
# look up a key ($2) in the given cdb ($1)
cdbLookup = depot.nix.writeExecline "cdb-lookup" { readNArgs = 2; } [
# cdb ($1) on stdin
"redirfd"
"-r"
"0"
"$1"
# key ($2) lookup
bins.cdbget
"$2"
];
in
depot.nix.readTree.drvTargets {
inherit
router
depotCgitLink
site-server
notes-index
notes-index-html
projects-index
projects-index-html
posts-index-html
;
}
