Beware that stdenv doesn't build. It seems something more will be needed than just resolution of merge conflicts.
472 lines
13 KiB
Nix
472 lines
13 KiB
Nix
/* String manipulation functions. */
|
||
|
||
let lib = import ./default.nix;
|
||
|
||
inherit (builtins) length;
|
||
|
||
in
|
||
|
||
rec {
|
||
|
||
inherit (builtins) stringLength substring head tail isString replaceStrings;
|
||
|
||
/* Concatenate a list of strings.
|
||
|
||
Example:
|
||
concatStrings ["foo" "bar"]
|
||
=> "foobar"
|
||
*/
|
||
concatStrings =
|
||
if builtins ? concatStringsSep then
|
||
builtins.concatStringsSep ""
|
||
else
|
||
lib.foldl' (x: y: x + y) "";
|
||
|
||
/* Map a function over a list and concatenate the resulting strings.
|
||
|
||
Example:
|
||
concatMapStrings (x: "a" + x) ["foo" "bar"]
|
||
=> "afooabar"
|
||
*/
|
||
concatMapStrings = f: list: concatStrings (map f list);
|
||
|
||
/* Like `concatMapStrings' except that the f functions also gets the
|
||
position as a parameter.
|
||
|
||
Example:
|
||
concatImapStrings (pos: x: "${toString pos}-${x}") ["foo" "bar"]
|
||
=> "1-foo2-bar"
|
||
*/
|
||
concatImapStrings = f: list: concatStrings (lib.imap f list);
|
||
|
||
/* Place an element between each element of a list
|
||
|
||
Example:
|
||
intersperse "/" ["usr" "local" "bin"]
|
||
=> ["usr" "/" "local" "/" "bin"].
|
||
*/
|
||
intersperse = separator: list:
|
||
if list == [] || length list == 1
|
||
then list
|
||
else tail (lib.concatMap (x: [separator x]) list);
|
||
|
||
/* Concatenate a list of strings with a separator between each element
|
||
|
||
Example:
|
||
concatStringsSep "/" ["usr" "local" "bin"]
|
||
=> "usr/local/bin"
|
||
*/
|
||
concatStringsSep = builtins.concatStringsSep or (separator: list:
|
||
concatStrings (intersperse separator list));
|
||
|
||
/* First maps over the list and then concatenates it.
|
||
|
||
Example:
|
||
concatMapStringsSep "-" (x: toUpper x) ["foo" "bar" "baz"]
|
||
=> "FOO-BAR-BAZ"
|
||
*/
|
||
concatMapStringsSep = sep: f: list: concatStringsSep sep (map f list);
|
||
|
||
/* First imaps over the list and then concatenates it.
|
||
|
||
Example:
|
||
|
||
concatImapStringsSep "-" (pos: x: toString (x / pos)) [ 6 6 6 ]
|
||
=> "6-3-2"
|
||
*/
|
||
concatImapStringsSep = sep: f: list: concatStringsSep sep (lib.imap f list);
|
||
|
||
/* Construct a Unix-style search path consisting of each `subDir"
|
||
directory of the given list of packages.
|
||
|
||
Example:
|
||
makeSearchPath "bin" ["/root" "/usr" "/usr/local"]
|
||
=> "/root/bin:/usr/bin:/usr/local/bin"
|
||
makeSearchPath "bin" ["/"]
|
||
=> "//bin"
|
||
*/
|
||
makeSearchPath = subDir: packages:
|
||
concatStringsSep ":" (map (path: path + "/" + subDir) packages);
|
||
|
||
/* Construct a library search path (such as RPATH) containing the
|
||
libraries for a set of packages
|
||
|
||
Example:
|
||
makeLibraryPath [ "/usr" "/usr/local" ]
|
||
=> "/usr/lib:/usr/local/lib"
|
||
pkgs = import <nixpkgs> { }
|
||
makeLibraryPath [ pkgs.openssl pkgs.zlib ]
|
||
=> "/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r/lib:/nix/store/wwh7mhwh269sfjkm6k5665b5kgp7jrk2-zlib-1.2.8/lib"
|
||
*/
|
||
makeLibraryPath = pkgs: makeSearchPath "lib"
|
||
# try to guess the right output of each pkg
|
||
(map (pkg: pkg.lib or (pkg.out or pkg)) pkgs);
|
||
|
||
/* Construct a binary search path (such as $PATH) containing the
|
||
binaries for a set of packages.
|
||
|
||
Example:
|
||
makeBinPath ["/root" "/usr" "/usr/local"]
|
||
=> "/root/bin:/usr/bin:/usr/local/bin"
|
||
*/
|
||
makeBinPath = makeSearchPath "bin";
|
||
|
||
|
||
/* Construct a perl search path (such as $PERL5LIB)
|
||
|
||
FIXME(zimbatm): this should be moved in perl-specific code
|
||
|
||
Example:
|
||
pkgs = import <nixpkgs> { }
|
||
makePerlPath [ pkgs.perlPackages.NetSMTP ]
|
||
=> "/nix/store/n0m1fk9c960d8wlrs62sncnadygqqc6y-perl-Net-SMTP-1.25/lib/perl5/site_perl"
|
||
*/
|
||
makePerlPath = makeSearchPath "lib/perl5/site_perl";
|
||
|
||
/* Dependening on the boolean `cond', return either the given string
|
||
or the empty string. Useful to contatenate against a bigger string.
|
||
|
||
Example:
|
||
optionalString true "some-string"
|
||
=> "some-string"
|
||
optionalString false "some-string"
|
||
=> ""
|
||
*/
|
||
optionalString = cond: string: if cond then string else "";
|
||
|
||
/* Determine whether a string has given prefix.
|
||
|
||
Example:
|
||
hasPrefix "foo" "foobar"
|
||
=> true
|
||
hasPrefix "foo" "barfoo"
|
||
=> false
|
||
*/
|
||
hasPrefix = pref: str:
|
||
substring 0 (stringLength pref) str == pref;
|
||
|
||
/* Determine whether a string has given suffix.
|
||
|
||
Example:
|
||
hasSuffix "foo" "foobar"
|
||
=> false
|
||
hasSuffix "foo" "barfoo"
|
||
=> true
|
||
*/
|
||
hasSuffix = suff: str:
|
||
let
|
||
lenStr = stringLength str;
|
||
lenSuff = stringLength suff;
|
||
in lenStr >= lenSuff &&
|
||
substring (lenStr - lenSuff) lenStr str == suff;
|
||
|
||
/* Convert a string to a list of characters (i.e. singleton strings).
|
||
This allows you to, e.g., map a function over each character. However,
|
||
note that this will likely be horribly inefficient; Nix is not a
|
||
general purpose programming language. Complex string manipulations
|
||
should, if appropriate, be done in a derivation.
|
||
Also note that Nix treats strings as a list of bytes and thus doesn't
|
||
handle unicode.
|
||
|
||
Example:
|
||
stringToCharacters ""
|
||
=> [ ]
|
||
stringToCharacters "abc"
|
||
=> [ "a" "b" "c" ]
|
||
stringToCharacters "💩"
|
||
=> [ "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" ]
|
||
*/
|
||
stringToCharacters = s:
|
||
map (p: substring p 1 s) (lib.range 0 (stringLength s - 1));
|
||
|
||
/* Manipulate a string character by character and replace them by
|
||
strings before concatenating the results.
|
||
|
||
Example:
|
||
stringAsChars (x: if x == "a" then "i" else x) "nax"
|
||
=> "nix"
|
||
*/
|
||
stringAsChars = f: s:
|
||
concatStrings (
|
||
map f (stringToCharacters s)
|
||
);
|
||
|
||
/* Escape occurrence of the elements of ‘list’ in ‘string’ by
|
||
prefixing it with a backslash.
|
||
|
||
Example:
|
||
escape ["(" ")"] "(foo)"
|
||
=> "\\(foo\\)"
|
||
*/
|
||
escape = list: replaceChars list (map (c: "\\${c}") list);
|
||
|
||
/* Escape all characters that have special meaning in the Bourne shell.
|
||
|
||
Example:
|
||
escapeShellArg "so([<>])me"
|
||
=> "so\\(\\[\\<\\>\\]\\)me"
|
||
*/
|
||
escapeShellArg = lib.escape (stringToCharacters "\\ ';$`()|<>\t*[]");
|
||
|
||
/* Obsolete - use replaceStrings instead. */
|
||
replaceChars = builtins.replaceStrings or (
|
||
del: new: s:
|
||
let
|
||
substList = lib.zipLists del new;
|
||
subst = c:
|
||
let found = lib.findFirst (sub: sub.fst == c) null substList; in
|
||
if found == null then
|
||
c
|
||
else
|
||
found.snd;
|
||
in
|
||
stringAsChars subst s);
|
||
|
||
# Case conversion utilities.
|
||
lowerChars = stringToCharacters "abcdefghijklmnopqrstuvwxyz";
|
||
upperChars = stringToCharacters "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
|
||
|
||
/* Converts an ASCII string to lower-case.
|
||
|
||
Example:
|
||
toLower "HOME"
|
||
=> "home"
|
||
*/
|
||
toLower = replaceChars upperChars lowerChars;
|
||
|
||
/* Converts an ASCII string to upper-case.
|
||
|
||
Example:
|
||
toLower "home"
|
||
=> "HOME"
|
||
*/
|
||
toUpper = replaceChars lowerChars upperChars;
|
||
|
||
/* Appends string context from another string. This is an implementation
|
||
detail of Nix.
|
||
|
||
Strings in Nix carry an invisible `context' which is a list of strings
|
||
representing store paths. If the string is later used in a derivation
|
||
attribute, the derivation will properly populate the inputDrvs and
|
||
inputSrcs.
|
||
|
||
Example:
|
||
pkgs = import <nixpkgs> { };
|
||
addContextFrom pkgs.coreutils "bar"
|
||
=> "bar"
|
||
*/
|
||
addContextFrom = a: b: substring 0 0 a + b;
|
||
|
||
/* Cut a string with a separator and produces a list of strings which
|
||
were separated by this separator.
|
||
|
||
NOTE: this function is not performant and should be avoided
|
||
|
||
Example:
|
||
splitString "." "foo.bar.baz"
|
||
=> [ "foo" "bar" "baz" ]
|
||
splitString "/" "/usr/local/bin"
|
||
=> [ "" "usr" "local" "bin" ]
|
||
*/
|
||
splitString = _sep: _s:
|
||
let
|
||
sep = addContextFrom _s _sep;
|
||
s = addContextFrom _sep _s;
|
||
sepLen = stringLength sep;
|
||
sLen = stringLength s;
|
||
lastSearch = sLen - sepLen;
|
||
startWithSep = startAt:
|
||
substring startAt sepLen s == sep;
|
||
|
||
recurse = index: startAt:
|
||
let cutUntil = i: [(substring startAt (i - startAt) s)]; in
|
||
if index < lastSearch then
|
||
if startWithSep index then
|
||
let restartAt = index + sepLen; in
|
||
cutUntil index ++ recurse restartAt restartAt
|
||
else
|
||
recurse (index + 1) startAt
|
||
else
|
||
cutUntil sLen;
|
||
in
|
||
recurse 0 0;
|
||
|
||
/* Return the suffix of the second argument if the first argument matches
|
||
its prefix.
|
||
|
||
Example:
|
||
removePrefix "foo." "foo.bar.baz"
|
||
=> "bar.baz"
|
||
removePrefix "xxx" "foo.bar.baz"
|
||
=> "foo.bar.baz"
|
||
*/
|
||
removePrefix = pre: s:
|
||
let
|
||
preLen = stringLength pre;
|
||
sLen = stringLength s;
|
||
in
|
||
if hasPrefix pre s then
|
||
substring preLen (sLen - preLen) s
|
||
else
|
||
s;
|
||
|
||
/* Return the prefix of the second argument if the first argument matches
|
||
its suffix.
|
||
|
||
Example:
|
||
removeSuffix "front" "homefront"
|
||
=> "home"
|
||
removeSuffix "xxx" "homefront"
|
||
=> "homefront"
|
||
*/
|
||
removeSuffix = suf: s:
|
||
let
|
||
sufLen = stringLength suf;
|
||
sLen = stringLength s;
|
||
in
|
||
if sufLen <= sLen && suf == substring (sLen - sufLen) sufLen s then
|
||
substring 0 (sLen - sufLen) s
|
||
else
|
||
s;
|
||
|
||
/* Return true iff string v1 denotes a version older than v2.
|
||
|
||
Example:
|
||
versionOlder "1.1" "1.2"
|
||
=> true
|
||
versionOlder "1.1" "1.1"
|
||
=> false
|
||
*/
|
||
versionOlder = v1: v2: builtins.compareVersions v2 v1 == 1;
|
||
|
||
/* Return true iff string v1 denotes a version equal to or newer than v2.
|
||
|
||
Example:
|
||
versionAtLeast "1.1" "1.0"
|
||
=> true
|
||
versionAtLeast "1.1" "1.1"
|
||
=> true
|
||
versionAtLeast "1.1" "1.2"
|
||
=> false
|
||
*/
|
||
versionAtLeast = v1: v2: !versionOlder v1 v2;
|
||
|
||
/* This function takes an argument that's either a derivation or a
|
||
derivation's "name" attribute and extracts the version part from that
|
||
argument.
|
||
|
||
Example:
|
||
getVersion "youtube-dl-2016.01.01"
|
||
=> "2016.01.01"
|
||
getVersion pkgs.youtube-dl
|
||
=> "2016.01.01"
|
||
*/
|
||
getVersion = x: (builtins.parseDrvName (x.name or x)).version;
|
||
|
||
/* Extract name with version from URL. Ask for separator which is
|
||
supposed to start extension.
|
||
|
||
Example:
|
||
nameFromURL "https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2" "-"
|
||
=> "nix"
|
||
nameFromURL "https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2" "_"
|
||
=> "nix-1.7-x86"
|
||
*/
|
||
nameFromURL = url: sep:
|
||
let
|
||
components = splitString "/" url;
|
||
filename = lib.last components;
|
||
name = builtins.head (splitString sep filename);
|
||
in assert name != filename; name;
|
||
|
||
/* Create an --{enable,disable}-<feat> string that can be passed to
|
||
standard GNU Autoconf scripts.
|
||
|
||
Example:
|
||
enableFeature true "shared"
|
||
=> "--enable-shared"
|
||
enableFeature false "shared"
|
||
=> "--disable-shared"
|
||
*/
|
||
enableFeature = enable: feat: "--${if enable then "enable" else "disable"}-${feat}";
|
||
|
||
/* Create a fixed width string with additional prefix to match
|
||
required width.
|
||
|
||
Example:
|
||
fixedWidthString 5 "0" (toString 15)
|
||
=> "00015"
|
||
*/
|
||
fixedWidthString = width: filler: str:
|
||
let
|
||
strw = lib.stringLength str;
|
||
reqWidth = width - (lib.stringLength filler);
|
||
in
|
||
assert strw <= width;
|
||
if strw == width then str else filler + fixedWidthString reqWidth filler str;
|
||
|
||
/* Format a number adding leading zeroes up to fixed width.
|
||
|
||
Example:
|
||
fixedWidthNumber 5 15
|
||
=> "00015"
|
||
*/
|
||
fixedWidthNumber = width: n: fixedWidthString width "0" (toString n);
|
||
|
||
/* Check whether a value is a store path.
|
||
|
||
Example:
|
||
isStorePath "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/bin/python"
|
||
=> false
|
||
isStorePath "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/"
|
||
=> true
|
||
isStorePath pkgs.python
|
||
=> true
|
||
*/
|
||
isStorePath = x: builtins.substring 0 1 (toString x) == "/" && dirOf (builtins.toPath x) == builtins.storeDir;
|
||
|
||
/* Convert string to int
|
||
Obviously, it is a bit hacky to use fromJSON that way.
|
||
|
||
Example:
|
||
toInt "1337"
|
||
=> 1337
|
||
toInt "-4"
|
||
=> -4
|
||
toInt "3.14"
|
||
=> error: floating point JSON numbers are not supported
|
||
*/
|
||
toInt = str:
|
||
let may_be_int = builtins.fromJSON str; in
|
||
if builtins.isInt may_be_int
|
||
then may_be_int
|
||
else throw "Could not convert ${str} to int.";
|
||
|
||
/* Read a list of paths from `file', relative to the `rootPath'. Lines
|
||
beginning with `#' are treated as comments and ignored. Whitespace
|
||
is significant.
|
||
|
||
NOTE: this function is not performant and should be avoided
|
||
|
||
Example:
|
||
readPathsFromFile /prefix
|
||
./pkgs/development/libraries/qt-5/5.4/qtbase/series
|
||
=> [ "/prefix/dlopen-resolv.patch" "/prefix/tzdir.patch"
|
||
"/prefix/dlopen-libXcursor.patch" "/prefix/dlopen-openssl.patch"
|
||
"/prefix/dlopen-dbus.patch" "/prefix/xdg-config-dirs.patch"
|
||
"/prefix/nix-profiles-library-paths.patch"
|
||
"/prefix/compose-search-path.patch" ]
|
||
*/
|
||
readPathsFromFile = rootPath: file:
|
||
let
|
||
root = toString rootPath;
|
||
lines =
|
||
builtins.map (lib.removeSuffix "\n")
|
||
(lib.splitString "\n" (builtins.readFile file));
|
||
removeComments = lib.filter (line: !(lib.hasPrefix "#" line));
|
||
relativePaths = removeComments lines;
|
||
absolutePaths = builtins.map (path: builtins.toPath (root + "/" + path)) relativePaths;
|
||
in
|
||
absolutePaths;
|
||
}
|