feat(bud): implement a 'cfg' command for managing profiles

bud/cfg.bash

@@ -0,0 +1,166 @@
+#!/usr/bin/env bash
+
+set -e -o pipefail
+
+function echo () {
+  printf "$1\n"
+}
+
+# Turns an attr path specified like "nixos.profiles.profile" into
+# it's proper devos structured filesystem path
+function parse_attrpath () {
+  attr_origpath="$1"
+
+  if [[ $attr_origpath == "nixos."* ]]; then
+    attr_path="${attr_origpath/nixos./}"
+    attr_path="${attr_path//./\/}"
+  elif [[ $attr_origpath == "hm."* ]]; then
+    attr_path="${attr_origpath/hm./}"
+    attr_path="users/${attr_path//./\/}"
+  else
+    echo "Please make sure your profile path starts with either 'nixos.' or 'hm.'!"
+    exit 1
+  fi
+
+  printf "$attr_path"
+}
+
+# Parses source URLs like "owner/repo" or "gitlab:owner/repo"
+# and turns them into a proper URL
+function parse_sourceurl () {
+  url="$1"
+
+  if [[ $url == "github:"* ]]; then
+    url="${url/"github:"/}"
+    url="https://github.com/$url"
+  elif [[ $url == "gitlab:"* ]]; then
+    url="${url/"gitlab:"/}"
+    url="https://gitlab.com/$url"
+  elif [[ $url != "http"* ]]; then
+    url="https://github.com/$url"
+  fi
+
+  printf "$url"
+}
+
+# Creates a repository path in the cache from an URL
+function make_repo_path () {
+  url="$1"
+
+  repo_name="${url##*/}"
+  repo_tmp="${url/\/$repo_name/}"
+  repo_owner="${repo_tmp##*/}"
+
+  printf "$GIT_CACHE/$repo_owner-$repo_name"
+}
+
+# Clones a repository into cache if it does not exist
+# otherwise update the repository
+function fetch_repo () {
+  url="$1"
+  repo_path="$2"
+
+  mkdir -p "$repo_path"
+  git clone --depth 1 "$url" "$repo_path" \
+    || git --git-dir "$repo_path/.git" --work-tree "$repo_path" pull
+
+  if [[ $? != 0 ]]; then
+    echo "Failed to fetch '$url' with git, error code: $?"
+    exit 2
+  fi
+}
+
+function print_source_help () {
+  echo "'source' can be either a git repository URL, 'github:owner/repo' or 'gitlab:owner/repo'"
+  echo "if 'source' is given as 'owner/repo', it will default to 'github:owner/repo'"
+}
+
+GIT_CACHE="$HOME/.cache/bud/git"
+
+case "$1" in
+  "show")
+    shift 1
+
+    url="$1"
+
+    if [[ -z "$url" ]]; then
+      echo "Show profiles available in the specified source\n"
+      echo "Usage: show source\n"
+      print_source_help
+      echo "if 'source' is '.', it will show your own profiles"
+      exit 1
+    fi
+
+    if [[ "$url" == "." ]]; then
+      repo_path="."
+    else
+      url=$(parse_sourceurl "$url")
+      repo_path=$(make_repo_path "$url")
+
+      fetch_repo "$url" "$repo_path" || exit $?
+    fi
+
+    echo "nixos profiles:"
+    exa -Th "$repo_path/profiles" | grep -v "default.nix" | tail -n +2 || echo "no nixos profiles found"
+    echo "home-manager profiles:"
+    exa -Th "$repo_path/users/profiles" | grep -v "default.nix" | tail -n +2 || echo "no home-manager profiles found"
+    ;;
+  "remove")
+    shift 1
+
+    attr_origpath=$1
+
+    if [[ -z "$attr_origpath" ]]; then
+      echo "Remove a profile from your config\n"
+      echo "Usage: remove (nixos|hm).profiles.[PROFILE]"
+      exit 1
+    fi
+
+    attr_path=$(parse_attrpath "$attr_origpath") || exit $?
+
+    if [[ -e "$attr_path" ]]; then
+      rm -r "$attr_path"
+      echo "deleted cfg '$attr_origpath'"
+    else
+      echo "cfg '$attr_origpath' does not exist in your config"
+      exit 1
+    fi
+    ;;
+  "add")
+    shift 1
+
+    url=$1
+    attr_origpath=$2
+
+    if [[ -z "$url" || -z "$attr_origpath" ]]; then
+      echo "Add a profile from the specified source\n"
+      echo "Usage: add source (nixos|hm).profiles.[PROFILE]\n"
+      print_source_help
+      exit 1
+    fi
+
+    attr_path=$(parse_attrpath "$attr_origpath") || exit $?
+    url=$(parse_sourceurl "$url")
+    repo_path=$(make_repo_path "$url")
+    repo_attr_path="$repo_path/$attr_path"
+
+    fetch_repo "$url" "$repo_path" || exit $?
+
+    if [[ -e "$repo_attr_path" ]]; then
+      mkdir -p "$attr_path"
+      cp -r "$repo_attr_path"/* "$attr_path/"
+      echo "Added profile '$attr_origpath'!"
+    else
+      echo "Profile '$attr_origpath' does not exist in user repository!"
+      exit 3
+    fi
+    ;;
+  *)
+    echo "Available subcommands are:"
+    echo "  - 'add': Add a profile from the specified source"
+    echo "  - 'show': Show profiles available in the specified source"
+    echo "  - 'remove': Remove a profile from your config\n"
+    echo "run 'bud cfg command' for more info about a command"
+    exit 1
+    ;;
+esac

bud/default.nix

@@ -6,5 +6,11 @@
       help = "Copy the desired template to DEST";
       script = ./get.bash;
     };
+    cfg = {
+      writer = budUtils.writeBashWithPaths [ git coreutils exa gnugrep ];
+      synopsis = "cfg [SUBCOMMAND]";
+      help = "Manage profiles (add, remove, etc.) for your configuration";
+      script = ./cfg.bash;
+    };
   };
 }