init: debian indexer

Add an indexer for debian packages based on debians popularity contest.

options:
	- outputFile
	- maxPackages
	- exclusions
	- inclusions

Co-authored-by: Ctem <c@ctem.me>

src/indexers/debian-popcon/default.nix

@@ -0,0 +1,65 @@
+{...}: {
+  indexBin = {
+    utils,
+    coreutils,
+    curl,
+    gnused,
+    gawk,
+    jq,
+    ...
+  }:
+    utils.writePureShellScript
+    [coreutils curl jq gnused gawk]
+    ''
+      cd $WORKDIR
+
+      input=''${1:?"please provide an input as a JSON file"}
+
+      outFile=$(jq '.outputFile' -c -r $input)
+      maxPackages=$(jq '.maxPackages' -c -r $input)
+      exclusions=$(jq '.modifications.exclusions' -c -r $input)
+      additions=$(jq '.modifications.additions' -c -r $input)
+
+      tmpFile="$TMPDIR/tmp.json"
+      helpFile="$TMPDIR/help.json"
+
+      url="https://popcon.debian.org/by_vote"
+      curl -k "$url" > "$tmpFile"
+
+      # remove top comment line
+      sed -i '/^#/d' $tmpFile
+      head -n$maxPackages $tmpFile > $helpFile
+      mv $helpFile $tmpFile
+      awk '{print $2}' $tmpFile > $helpFile
+
+      # remove enclosing square brackets
+      additions=''${additions:1}
+      additions=''${additions::-1}
+
+      # remove double quotes from each package name
+      additions=$(echo $additions | sed 's/,/ /g')
+      for pkg in $additions;do
+        pkg="''${pkg%\"}"
+        pkg="''${pkg#\"}"
+        echo $pkg >> $helpFile
+      done
+
+      # remove enclosing square brackets
+      exclusions=''${exclusions:1}
+      exclusions=''${exclusions::-1}
+
+      # remove double quotes from each package name
+      exclusions=$(echo $exclusions | sed 's/,/ /g')
+      for pkg in $exclusions;do
+        pkg="''${pkg%\"}"
+        pkg="''${pkg#\"}"
+        sed -i -e "/$pkg/d" $helpFile
+      done
+
+      jq -R -s -c 'split("\n")' < $helpFile >$tmpFile
+      sed -i -e 's/,""//g' $tmpFile
+      sed -i -e 's/\["/\["debian:/g' $tmpFile
+      sed -i -e 's/,"/,"debian:/g' $tmpFile
+      mv "$tmpFile" "$(realpath $outFile)"
+    '';
+}

src/specifications/indexers/debian-popcon/input.example.json

@@ -0,0 +1,8 @@
+{
+  "outputFile": "index.json",
+  "maxPackages": 200,
+  "modifications": {
+    "exclusions": ["apt"],
+    "additions": ["htop"]
+  }
+}