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Diffstat (limited to 'infra/libkookie/nixpkgs/pkgs/build-support/nix-gitignore/default.nix')
| -rw-r--r-- | infra/libkookie/nixpkgs/pkgs/build-support/nix-gitignore/default.nix | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/infra/libkookie/nixpkgs/pkgs/build-support/nix-gitignore/default.nix b/infra/libkookie/nixpkgs/pkgs/build-support/nix-gitignore/default.nix new file mode 100644 index 000000000000..fba09adc2d41 --- /dev/null +++ b/infra/libkookie/nixpkgs/pkgs/build-support/nix-gitignore/default.nix @@ -0,0 +1,180 @@ +# https://github.com/siers/nix-gitignore/ + +{ lib, runCommand }: + +# An interesting bit from the gitignore(5): +# - A slash followed by two consecutive asterisks then a slash matches +# - zero or more directories. For example, "a/**/b" matches "a/b", +# - "a/x/b", "a/x/y/b" and so on. + +with builtins; + +let + debug = a: trace a a; + last = l: elemAt l ((length l) - 1); + + throwIfOldNix = let required = "2.0"; in + if compareVersions nixVersion required == -1 + then throw "nix (v${nixVersion} =< v${required}) is too old for nix-gitignore" + else true; +in rec { + # [["good/relative/source/file" true] ["bad.tmpfile" false]] -> root -> path + filterPattern = patterns: root: + let + filters = map (pair: relPath: if match (head pair) relPath == null then true else last pair) patterns; + in + name: _type: + let + relPath = lib.removePrefix ((toString root) + "/") name; + in foldl' (acc: f: if acc == true then f relPath else acc) true filters; + + # string -> [[regex bool]] + gitignoreToPatterns = gitignore: + assert throwIfOldNix; + let + # ignore -> bool + isComment = i: (match "^(#.*|$)" i) != null; + + # ignore -> [ignore bool] + computeNegation = l: + let split = match "^(!?)(.*)" l; + in [(elemAt split 1) (head split == "!")]; + + # ignore -> regex + substWildcards = + let + special = "^$.+{}()"; + escs = "\\*?"; + splitString = + let recurse = str : [(substring 0 1 str)] ++ + (if str == "" then [] else (recurse (substring 1 (stringLength(str)) str) )); + in str : recurse str; + chars = s: filter (c: c != "" && !isList c) (splitString s); + escape = s: map (c: "\\" + c) (chars s); + in + replaceStrings + ((chars special) ++ (escape escs) ++ ["**/" "**" "*" "?"]) + ((escape special) ++ (escape escs) ++ ["(.*/)?" ".*" "[^/]*" "[^/]"]); + + # (regex -> regex) -> regex -> regex + mapAroundCharclass = f: r: # rl = regex or list + let slightFix = replaceStrings ["\\]"] ["]"]; + in + concatStringsSep "" + (map (rl: if isList rl then slightFix (elemAt rl 0) else f rl) + (split "(\\[([^\\\\]|\\\\.)+])" r)); + + # regex -> regex + handleSlashPrefix = l: + let + split = (match "^(/?)(.*)" l); + findSlash = l: if (match ".+/.+" l) != null then "" else l; + hasSlash = mapAroundCharclass findSlash l != l; + in + (if (elemAt split 0) == "/" || hasSlash + then "^" + else "(^|.*/)" + ) + (elemAt split 1); + + # regex -> regex + handleSlashSuffix = l: + let split = (match "^(.*)/$" l); + in if split != null then (elemAt split 0) + "($|/.*)" else l; + + # (regex -> regex) -> [regex, bool] -> [regex, bool] + mapPat = f: l: [(f (head l)) (last l)]; + in + map (l: # `l' for "line" + mapPat (l: handleSlashSuffix (handleSlashPrefix (mapAroundCharclass substWildcards l))) + (computeNegation l)) + (filter (l: !isList l && !isComment l) + (split "\n" gitignore)); + + gitignoreFilter = ign: let + patterns = gitignoreToPatterns ign; + in root: filterPattern patterns root; + + # string|[string|file] (→ [string|file] → [string]) -> string + gitignoreCompileIgnore = file_str_patterns: root: + let + onPath = f: a: if typeOf a == "path" then f a else a; + str_patterns = map (onPath readFile) (lib.toList file_str_patterns); + in concatStringsSep "\n" str_patterns; + + gitignoreFilterPure = filter: patterns: root: let + compiledFilter = gitignoreCompileIgnore patterns root; + filterFn = gitignoreFilter compiledFilter; + in name: type: filterFn root name type && filter name type; + + # This is a very hacky way of programming this! + # A better way would be to reuse existing filtering by making multiple gitignore functions per each root. + # Then for each file find the set of roots with gitignores (and functions). + # This would make gitignoreFilterSource very different from gitignoreFilterPure. + # rootPath → gitignoresConcatenated + compileRecursiveGitignore = root: + let + dirOrIgnore = file: type: baseNameOf file == ".gitignore" || type == "directory"; + ignores = builtins.filterSource dirOrIgnore root; + in readFile ( + runCommand "${baseNameOf root}-recursive-gitignore" {} '' + cd ${ignores} + + find -type f -exec sh -c ' + rel="$(realpath --relative-to=. "$(dirname "$1")")/" + if [ "$rel" = "./" ]; then rel=""; fi + + awk -v prefix="$rel" -v root="$1" -v top="$(test -z "$rel" && echo 1)" " + BEGIN { print \"# \"root } + + /^!?[^\\/]+\/?$/ { + match(\$0, /^!?/, negation) + sub(/^!?/, \"\") + + if (top) { middle = \"\" } else { middle = \"**/\" } + + print negation[0] prefix middle \$0 + } + + /^!?(\\/|.*\\/.+$)/ { + match(\$0, /^!?/, negation) + sub(/^!?/, \"\") + + if (!top) sub(/^\//, \"\") + + print negation[0] prefix \$0 + } + + END { print \"\" } + " "$1" + ' sh {} \; > $out + ''); + + withGitignoreFile = patterns: root: + lib.toList patterns ++ [(root + "/.gitignore")]; + + withRecursiveGitignoreFile = patterns: root: + lib.toList patterns ++ [(compileRecursiveGitignore root)]; + + # filterSource derivatives + + gitignoreFilterSourcePure = filter: patterns: root: + filterSource (gitignoreFilterPure filter patterns root) root; + + gitignoreFilterSource = filter: patterns: root: + gitignoreFilterSourcePure filter (withGitignoreFile patterns root) root; + + gitignoreFilterRecursiveSource = filter: patterns: root: + gitignoreFilterSourcePure filter (withRecursiveGitignoreFile patterns root) root; + + # "Filter"-less alternatives + + gitignoreSourcePure = gitignoreFilterSourcePure (_: _: true); + gitignoreSource = patterns: let type = typeOf patterns; in + if (type == "string" && pathExists patterns) || type == "path" + then throw + "type error in gitignoreSource(patterns -> source -> path), " + "use [] or \"\" if there are no additional patterns" + else gitignoreFilterSource (_: _: true) patterns; + + gitignoreRecursiveSource = gitignoreFilterSourcePure (_: _: true); +} |