Nixpkgs Users and Contributors Guide

List of Examples

• 8.1. Printing when the predicate is false
• 8.2. Ensuring a user provided a possible value
• 8.3. Extracting a value from a nested attribute set
• 8.4. No value at the path, instead using the default
• 8.5. A nested value does exist inside a set
• 8.6. Creating a new nested attribute set
• 8.7. Succesfully getting a value from an attribute set
• 8.8. Throwing after failing to get a value from an attribute set
• 8.9. Getting several values from an attribute set
• 8.10. Getting missing values from an attribute set
• 8.11.
• 8.12. Collect an attribute from a list of attribute sets.
• 8.13. Filtering an attributeset
• 8.14. Recursively filtering an attribute set
• 8.15. Combining an attribute of lists in to one attribute set
• 8.16. Collecting all lists from an attribute set
• 8.17. Collecting all attribute-sets which contain the outPath attribute name.
• 8.18. Creating a name value pair
• 8.19. Modifying each value of an attribute set
• 8.20. Change the name and value of each attribute of an attribute set
• 8.21. Combine attribute values and names in to a list
• 8.22. A contrived example of using lib.attrsets.mapAttrsRecursive
• 8.23. Only convert attribute values to JSON if the containing attribute set is marked for recursion
• 8.24. Generate an attrset based on names only
• 8.25. A package is a derivation
• 8.26. Anything else is not a derivation
• 8.27. Return the provided attribute set when cond is true
• 8.28. Return an empty attribute set when cond is false
• 8.29. Summing a list of attribute sets of numbers
• 8.30. Summing a list of attribute sets of numbers
• 8.31. Combining a list of attribute sets
• 8.32. Recursively merging two attribute sets
• 8.33. Recursively merging two attribute sets
• 8.34. lib.strings.concatStrings usage example
• 8.35. lib.strings.concatMapStrings usage example
• 8.36. lib.strings.concatImapStrings usage example
• 8.37. lib.strings.intersperse usage example
• 8.38. lib.strings.concatStringsSep usage example
• 8.39. lib.strings.concatMapStringsSep usage example
• 8.40. lib.strings.concatImapStringsSep usage example
• 8.41. lib.strings.makeSearchPath usage example
• 8.42. lib.strings.makeSearchPathOutput usage example
• 8.43. lib.strings.makeLibraryPath usage example
• 8.44. lib.strings.makeBinPath usage example
• 8.45. lib.strings.optionalString usage example
• 8.46. lib.strings.hasPrefix usage example
• 8.47. lib.strings.hasSuffix usage example
• 8.48. lib.strings.hasInfix usage example
• 8.49. lib.strings.stringToCharacters usage example
• 8.50. lib.strings.stringAsChars usage example
• 8.51. lib.strings.escape usage example
• 8.52. lib.strings.escapeShellArg usage example
• 8.53. lib.strings.escapeShellArgs usage example
• 8.54. lib.strings.escapeNixString usage example
• 8.55. lib.strings.toLower usage example
• 8.56. lib.strings.toUpper usage example
• 8.57. lib.strings.addContextFrom usage example
• 8.58. lib.strings.splitString usage example
• 8.59. lib.strings.removePrefix usage example
• 8.60. lib.strings.removeSuffix usage example
• 8.61. lib.strings.versionOlder usage example
• 8.62. lib.strings.versionAtLeast usage example
• 8.63. lib.strings.getVersion usage example
• 8.64. lib.strings.nameFromURL usage example
• 8.65. lib.strings.enableFeature usage example
• 8.66. lib.strings.enableFeatureAs usage example
• 8.67. lib.strings.withFeature usage example
• 8.68. lib.strings.withFeatureAs usage example
• 8.69. lib.strings.fixedWidthString usage example
• 8.70. lib.strings.fixedWidthNumber usage example
• 8.71. lib.strings.isStorePath usage example
• 8.72. lib.strings.toInt usage example
• 8.73. lib.strings.readPathsFromFile usage example
• 8.74. lib.strings.fileContents usage example
• 8.75. lib.trivial.const usage example
• 8.76. lib.trivial.concat usage example
• 8.77. lib.trivial.mergeAttrs usage example
• 8.78. lib.trivial.flip usage example
• 8.79. lib.trivial.mapNullable usage example
• 8.80. lib.trivial.mod usage example
• 8.81. lib.trivial.splitByAndCompare usage example
• 8.82. lib.lists.singleton usage example
• 8.83. lib.lists.forEach usage example
• 8.84. lib.lists.foldr usage example
• 8.85. lib.lists.foldl usage example
• 8.86. lib.lists.imap0 usage example
• 8.87. lib.lists.imap1 usage example
• 8.88. lib.lists.concatMap usage example
• 8.89. lib.lists.flatten usage example
• 8.90. lib.lists.remove usage example
• 8.91. lib.lists.findSingle usage example
• 8.92. lib.lists.findFirst usage example
• 8.93. lib.lists.any usage example
• 8.94. lib.lists.all usage example
• 8.95. lib.lists.count usage example
• 8.96. lib.lists.optional usage example
• 8.97. lib.lists.optionals usage example
• 8.98. lib.lists.toList usage example
• 8.99. lib.lists.range usage example
• 8.100. lib.lists.partition usage example
• 8.101. lib.lists.groupBy' usage example
• 8.102. lib.lists.zipListsWith usage example
• 8.103. lib.lists.zipLists usage example
• 8.104. lib.lists.reverseList usage example
• 8.105. lib.lists.listDfs usage example
• 8.106. lib.lists.toposort usage example
• 8.107. lib.lists.sort usage example
• 8.108. lib.lists.compareLists usage example
• 8.109. lib.lists.naturalSort usage example
• 8.110. lib.lists.take usage example
• 8.111. lib.lists.drop usage example
• 8.112. lib.lists.sublist usage example
• 8.113. lib.lists.last usage example
• 8.114. lib.lists.init usage example
• 8.115. lib.lists.crossLists usage example
• 8.116. lib.lists.unique usage example
• 8.117. lib.lists.intersectLists usage example
• 8.118. lib.lists.subtractLists usage example
• 8.119. lib.debug.traceIf usage example
• 8.120. lib.debug.traceValFn usage example
• 8.121. lib.debug.traceVal usage example
• 8.122. lib.debug.traceSeq usage example
• 8.123. lib.debug.traceSeqN usage example
• 8.124. lib.debug.testAllTrue usage example
• 8.125. lib.options.isOption usage example
• 8.126. lib.options.mkOption usage example
• 8.127. lib.options.mkEnableOption usage example
• 8.128. lib.options.getValues usage example
• 8.129. lib.options.getFiles usage example
• 8.130. lib.options.showOption usage example
• 8.131. Docker build
• 8.132. Impurely Defining a Docker Layer's Creation Date
• 8.133. Docker pull
• 8.134. Docker export
• 8.135. Shadow base files
• 8.136. Making a Hello World Snap
• 8.137. Making a Graphical Snap
• 10.1. bower.json
• 10.2. buildBowerComponents
• 10.3. Example build script (gulpfile.js)
• 10.4. Full example — default.nix
• 10.5. buildGoModule
• 10.6. buildGoPackage
• 10.7. deps.nix
• 10.8. Nix expression for a Qt package (default.nix)
• 10.9. Adding a Qt library to all-packages.nix
• 10.10. Adding a Qt application to all-packages.nix
• 16.1. Sample template for a package update review
• 16.2. Sample template for a new package review
• 16.3. Sample template for a module update review
• 16.4. Sample template for a new module review