rules: Add support for pkg-config

3 files changed, 249 insertions, 2 deletions

diff --git a/CC/EXPRESSIONS b/CC/EXPRESSIONS
index 57418d6..c1c11f3 100644
--- a/CC/EXPRESSIONS
+++ b/CC/EXPRESSIONS
@@ -333,6 +333,114 @@
       }
     }
   }
+, "pkg-config":
+  { "vars":
+    [ "pkg-name"
+    , "pkg-prefix"
+    , "pkg-version"
+    , "pkg-cflags"
+    , "pkg-ldflags"
+    , "pkg-libs"
+    , "flat-libs"
+    ]
+  , "imports": {"contains": ["", "contains"]}
+  , "expression":
+    { "type": "singleton_map"
+    , "key":
+      {"type": "join", "$1": [{"type": "var", "name": "pkg-name"}, ".pc"]}
+    , "value":
+      { "type": "BLOB"
+      , "data":
+        { "type": "join"
+        , "separator": "\n"
+        , "$1":
+          [ { "type": "join"
+            , "$1":
+              [ "prefix="
+              , {"type": "var", "name": "pkg-prefix", "default": "/"}
+              ]
+            }
+          , "libdir=${prefix}/lib"
+          , "includedir=${prefix}/include"
+          , { "type": "join"
+            , "$1": ["Name: ", {"type": "var", "name": "pkg-name"}]
+            }
+          , { "type": "join"
+            , "$1":
+              [ "Version: "
+              , {"type": "var", "name": "pkg-version", "default": "unknown"}
+              ]
+            }
+          , { "type": "join"
+            , "$1":
+              [ "Description: Pkg-config for "
+              , {"type": "var", "name": "pkg-name"}
+              , ", generated by JustBuild"
+              ]
+            }
+          , "URL: unknown"
+          , { "type": "join"
+            , "separator": " "
+            , "$1":
+              { "type": "++"
+              , "$1":
+                [ ["Cflags:", "-I${includedir}"]
+                , {"type": "var", "name": "pkg-cflags"}
+                ]
+              }
+            }
+          , { "type": "join"
+            , "separator": " "
+            , "$1":
+              { "type": "++"
+              , "$1":
+                [ ["Libs:"]
+                , { "type": "if"
+                  , "cond": {"type": "var", "name": "flat-libs"}
+                  , "then": ["-L${libdir}"]
+                  }
+                , { "type": "let*"
+                  , "bindings":
+                    [ [ "list"
+                      , { "type": "keys"
+                        , "$1": {"type": "var", "name": "pkg-libs"}
+                        }
+                      ]
+                    ]
+                  , "body":
+                    { "type": "foreach"
+                    , "var": "item"
+                    , "range": {"type": "var", "name": "pkg-ldflags"}
+                    , "body":
+                      { "type": "if"
+                      , "cond": {"type": "CALL_EXPRESSION", "name": "contains"}
+                      , "then":
+                        { "type": "join"
+                        , "$1":
+                          { "type": "if"
+                          , "cond": {"type": "var", "name": "flat-libs"}
+                          , "then":
+                            [ "-l:"
+                            , { "type": "basename"
+                              , "$1": {"type": "var", "name": "item"}
+                              }
+                            ]
+                          , "else":
+                            ["${libdir}/", {"type": "var", "name": "item"}]
+                          }
+                        }
+                      , "else": {"type": "var", "name": "item"}
+                      }
+                    }
+                  }
+                ]
+              }
+            }
+          ]
+        }
+      }
+    }
+  }
 , "objects":
   { "vars":
     [ "COMPILER"
@@ -684,6 +792,7 @@
     , "ldflags"
     , "private-ldflags"
     , "stage"
+    , "pkg-name"
     , "extra-provides"
     , "public-fieldnames"
     , "private-fieldnames"
@@ -748,6 +857,12 @@
             }
           }
         ]
+      , [ "package"
+        , { "type": "singleton_map"
+          , "key": "name"
+          , "value": {"type": "var", "name": "pkg-name"}
+          }
+        ]
       ]
     , "body":
       { "type": "RESULT"
@@ -764,6 +879,7 @@
               , "link-args"
               , "run-libs"
               , "run-libs-args"
+              , "package"
               ]
             }
           , { "type": "var"
@@ -941,6 +1057,7 @@
     , "ldflags"
     , "private-ldflags"
     , "soversion"
+    , "pkg-name"
     , "extra-provides"
     , "deps-transition"
     , "public-fieldnames"
@@ -1023,6 +1140,20 @@
             }
           }
         ]
+      , [ "package"
+        , { "type": "let*"
+          , "bindings":
+            [ ["name", {"type": "var", "name": "pkg-name"}]
+            , [ "version"
+              , { "type": "join"
+                , "separator": "."
+                , "$1": {"type": "var", "name": "soversion"}
+                }
+              ]
+            ]
+          , "body": {"type": "env", "vars": ["name", "version"]}
+          }
+        ]
       ]
     , "body":
       { "type": "RESULT"
@@ -1039,6 +1170,7 @@
               , "link-args"
               , "run-libs"
               , "run-libs-args"
+              , "package"
               ]
             }
           , { "type": "var"
diff --git a/CC/RULES b/CC/RULES
index 00f3da6..91fcf3d 100644
--- a/CC/RULES
+++ b/CC/RULES
@@ -142,6 +142,7 @@
     , "ldflags"
     , "private-ldflags"
     , "soversion"
+    , "pkg-name"
     ]
   , "config_fields": ["shared"]
   , "config_vars":
@@ -222,6 +223,10 @@
       [ "The SOVERSION for shared libraries. Individual version components are"
       , "joined with \".\"."
       ]
+    , "pkg-name":
+      [ "Name to use for pkg-config files. If this field is empty, the field"
+      , "\"name\" is used instead."
+      ]
     }
   , "config_doc":
     { "CC":
@@ -393,6 +398,14 @@
       , ["ldflags", {"type": "FIELD", "name": "ldflags"}]
       , ["private-ldflags", {"type": "FIELD", "name": "private-ldflags"}]
       , ["soversion", {"type": "FIELD", "name": "soversion"}]
+      , [ "pkg-name"
+        , { "type": "if"
+          , "cond": {"type": "FIELD", "name": "pkg-name"}
+          , "then":
+            {"type": "join", "$1": {"type": "FIELD", "name": "pkg-name"}}
+          , "else": {"type": "var", "name": "name"}
+          }
+        ]
       , [ "deps-transition"
         , {"type": "CALL_EXPRESSION", "name": "fPIC transition"}
         ]
@@ -570,10 +583,12 @@
   { "doc":
     [ "Install target's artifacts with transitive dependencies. Depending on"
     , "the target, artifacts and dependencies will be installed to"
-    , "subdirectories \"bin\", \"include\", and \"lib\"."
+    , "subdirectories \"bin\", \"include\", and \"lib\". For library targets,"
+    , "a pkg-config file is generated and provided in \"share/pkgconfig\"."
     ]
+  , "config_vars": ["PREFIX"]
   , "target_fields": ["targets"]
-  , "string_fields": ["flat-libs"]
+  , "string_fields": ["flat-libs", "prefix"]
   , "imports":
     { "compile-deps": "compile-deps"
     , "compile-args-deps": "compile-args-deps"
@@ -581,6 +596,7 @@
     , "link-args-deps": "link-args-deps"
     , "run-libs-deps": "run-libs-deps"
     , "run-libs-args-deps": "run-libs-args-deps"
+    , "pkg-config": "pkg-config"
     }
   , "field_doc":
     { "targets": ["Targets to install artifacts from."]
@@ -589,6 +605,19 @@
       , "conflicts may occur if any of the (transitive) libraries happen to"
       , "have the same base name."
       ]
+    , "prefix":
+      [ "The prefix used for pkg-config files. The path will be made absolute"
+      , "and individual directory components are joined with \"/\". If no"
+      , "prefix is specified, the value from the config variable \"PREFIX\" is"
+      , "taken, with the default value being \"/\"."
+      ]
+    }
+  , "config_doc":
+    { "PREFIX":
+      [ "The absolute path that is used as prefix inside generated pkg-config"
+      , "files. The default value for this variable is \"/\". This variable"
+      , "is ignored if the field \"prefix\" is set."
+      ]
     }
   , "artifacts_doc":
     ["Installed artifacts in subdirectories (\"bin\"/\"include\"/\"lib\")."]
@@ -684,6 +713,72 @@
                       }
                     }
                   ]
+                , [ "pkg-name"
+                  , { "type": "lookup"
+                    , "key": "name"
+                    , "map": {"type": "var", "name": "package"}
+                    }
+                  ]
+                , [ "pkg-config"
+                  , { "type": "if"
+                    , "cond": {"type": "var", "name": "pkg-name"}
+                    , "then":
+                      { "type": "let*"
+                      , "bindings":
+                        [ [ "pkg-prefix"
+                          , { "type": "if"
+                            , "cond": {"type": "FIELD", "name": "prefix"}
+                            , "then":
+                              { "type": "join"
+                              , "separator": "/"
+                              , "$1":
+                                { "type": "++"
+                                , "$1":
+                                  [[""], {"type": "FIELD", "name": "prefix"}]
+                                }
+                              }
+                            , "else":
+                              {"type": "var", "name": "PREFIX", "default": "/"}
+                            }
+                          ]
+                        , [ "pkg-version"
+                          , { "type": "lookup"
+                            , "key": "version"
+                            , "map": {"type": "var", "name": "package"}
+                            }
+                          ]
+                        , [ "pkg-cflags"
+                          , { "type": "DEP_PROVIDES"
+                            , "dep": {"type": "var", "name": "target"}
+                            , "provider": "compile-args"
+                            , "default": []
+                            }
+                          ]
+                        , [ "pkg-ldflags"
+                          , { "type": "++"
+                            , "$1":
+                              [ { "type": "DEP_PROVIDES"
+                                , "dep": {"type": "var", "name": "target"}
+                                , "provider": "link-args"
+                                , "default": []
+                                }
+                              , { "type": "DEP_PROVIDES"
+                                , "dep": {"type": "var", "name": "target"}
+                                , "provider": "run-libs-args"
+                                , "default": []
+                                }
+                              ]
+                            }
+                          ]
+                        , ["pkg-libs", {"type": "var", "name": "libraries"}]
+                        , ["flat-libs", {"type": "FIELD", "name": "flat-libs"}]
+                        ]
+                      , "body":
+                        {"type": "CALL_EXPRESSION", "name": "pkg-config"}
+                      }
+                    , "else": {"type": "empty_map"}
+                    }
+                  ]
                 ]
               , "body":
                 { "type": "map_union"
@@ -704,6 +799,10 @@
                     , "msg": "install libraries may not overlap"
                     , "$1": {"type": "var", "name": "libraries"}
                     }
+                  , { "type": "to_subdir"
+                    , "subdir": "share/pkgconfig"
+                    , "$1": {"type": "var", "name": "pkg-config"}
+                    }
                   ]
                 }
               }
diff --git a/EXPRESSIONS b/EXPRESSIONS
index b974026..55976f4 100644
--- a/EXPRESSIONS
+++ b/EXPRESSIONS
@@ -226,4 +226,20 @@
       }
     }
   }
+, "contains":
+  { "vars": ["list", "item"]
+  , "expression":
+    { "type": "or"
+    , "$1":
+      { "type": "foreach"
+      , "var": "entry"
+      , "range": {"type": "var", "name": "list"}
+      , "body":
+        { "type": "=="
+        , "$1": {"type": "var", "name": "entry"}
+        , "$2": {"type": "var", "name": "item"}
+        }
+      }
+    }
+  }
 }