[librsvg] Visual Studio builds: Add scripts to generate .pc files

[Chun-wei Fan <fanchunwei src gnome org>]

commit 9b56f3f7dcfbca6a0fd491ef17aa301fdf5457ed
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Mar 3 17:19:43 2017 +0800

    Visual Studio builds: Add scripts to generate .pc files
    
    Integration into the Visual Studio process will follow, this uses Python
    to generate librsvg-2.0.pc.

 win32/Makefile.am |    3 +
 win32/pc_base.py  |  124 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 win32/replace.py  |  109 ++++++++++++++++++++++++++++++++++++++++++++++
 win32/rsvgpc.py   |   33 ++++++++++++++
 4 files changed, 269 insertions(+), 0 deletions(-)
---
diff --git a/win32/Makefile.am b/win32/Makefile.am
index dfe3961..fb64889 100644
--- a/win32/Makefile.am
+++ b/win32/Makefile.am
@@ -28,4 +28,7 @@ EXTRA_DIST = \
        introspection-msvc.mak  \
        detectenv-msvc.mak      \
        rsvg-rust.mak           \
+       pc_base.py              \
+       replace.py              \
+       rsvgpc.py               \
        $(GENERATED_ITEMS)
diff --git a/win32/pc_base.py b/win32/pc_base.py
new file mode 100644
index 0000000..f7976e8
--- /dev/null
+++ b/win32/pc_base.py
@@ -0,0 +1,124 @@
+#!/usr/bin/python
+#
+# Simple utility script to generate the basic info
+# needed in a .pc (pkg-config) file, used especially
+# for introspection purposes
+
+# This can be used in various projects where
+# there is the need to generate .pc files,
+# and is copied from GLib's $(srcroot)/win32
+
+# Author: Fan, Chun-wei
+# Date: March 10, 2016
+
+import os
+import sys
+import argparse
+
+class BasePCItems:
+    def __init__(self):
+        self.base_replace_items = {}
+        self.exec_prefix = ''
+        self.includedir = ''
+        self.libdir = ''
+        self.prefix = ''
+        self.srcdir = os.path.dirname(__file__)
+        self.top_srcdir = self.srcdir + '\\..'
+        self.version = ''
+
+    def setup(self, argv, parser=None):
+        if parser is None:
+            parser = argparse.ArgumentParser(description='Setup basic .pc file info')
+        parser.add_argument('--prefix', help='prefix of the installed library',
+                            required=True)
+        parser.add_argument('--exec-prefix',
+                            help='prefix of the installed programs, \
+                                  if different from the prefix')
+        parser.add_argument('--includedir',
+                            help='includedir of the installed library, \
+                                  if different from ${prefix}/include')
+        parser.add_argument('--libdir',
+                            help='libdir of the installed library, \
+                                  if different from ${prefix}/lib')
+        parser.add_argument('--version', help='Version of the package',
+                            required=True)
+        args = parser.parse_args()
+
+        self.version = args.version
+
+        # check whether the prefix and exec_prefix are valid
+        if not os.path.exists(args.prefix):
+            raise SystemExit('Specified prefix \'%s\' is invalid' % args.prefix)
+
+        # use absolute paths for prefix
+        self.prefix = os.path.abspath(args.prefix).replace('\\','/')
+
+        # check and setup the exec_prefix
+        if getattr(args, 'exec_prefix', None) is None:
+            exec_prefix_use_shorthand = True
+            self.exec_prefix = '${prefix}'
+        else:
+            if args.exec_prefix.startswith('${prefix}'):
+                exec_prefix_use_shorthand = True
+                input_exec_prefix = args.prefix + args.exec_prefix[len('${prefix}'):]
+            else:
+                exec_prefix_use_shorthand = False
+                input_exec_prefix = args.exec_prefix
+            if not os.path.exists(input_exec_prefix):
+                raise SystemExit('Specified exec_prefix \'%s\' is invalid' %
+                                  args.exec_prefix)
+            if exec_prefix_use_shorthand is True:
+                self.exec_prefix = args.exec_prefix.replace('\\','/')
+            else:
+                self.exec_prefix = os.path.abspath(input_exec_prefix).replace('\\','/')
+
+        # check and setup the includedir
+        if getattr(args, 'includedir', None) is None:
+            self.includedir = '${prefix}/include'
+        else:
+            if args.includedir.startswith('${prefix}'):
+                includedir_use_shorthand = True
+                input_includedir = args.prefix + args.includedir[len('${prefix}'):]
+            else:
+                if args.includedir.startswith('${exec_prefix}'):
+                    includedir_use_shorthand = True
+                    input_includedir = input_exec_prefix + args.includedir[len('${exec_prefix}'):]
+                else:
+                    includedir_use_shorthand = False
+                    input_includedir = args.includedir
+            if not os.path.exists(input_includedir):
+                raise SystemExit('Specified includedir \'%s\' is invalid' %
+                                  args.includedir)
+            if includedir_use_shorthand is True:
+                self.includedir = args.includedir.replace('\\','/')
+            else:
+                self.includedir = os.path.abspath(input_includedir).replace('\\','/')
+
+        # check and setup the libdir
+        if getattr(args, 'libdir', None) is None:
+            self.libdir = '${prefix}/lib'
+        else:
+            if args.libdir.startswith('${prefix}'):
+                libdir_use_shorthand = True
+                input_libdir = args.prefix + args.libdir[len('${prefix}'):]
+            else:
+                if args.libdir.startswith('${exec_prefix}'):
+                    libdir_use_shorthand = True
+                    input_libdir = input_exec_prefix + args.libdir[len('${exec_prefix}'):]
+                else:
+                    libdir_use_shorthand = False
+                    input_libdir = args.libdir
+            if not os.path.exists(input_libdir):
+                raise SystemExit('Specified libdir \'%s\' is invalid' %
+                                             args.libdir)
+            if libdir_use_shorthand is True:
+                self.libdir = args.libdir.replace('\\','/')
+            else:
+                self.libdir = os.path.abspath(input_libdir).replace('\\','/')
+
+        # setup dictionary for replacing items in *.pc.in
+        self.base_replace_items.update({'@VERSION@': self.version})
+        self.base_replace_items.update({'@prefix@': self.prefix})
+        self.base_replace_items.update({'@exec_prefix@': self.exec_prefix})
+        self.base_replace_items.update({'@libdir@': self.libdir})
+        self.base_replace_items.update({'@includedir@': self.includedir})
diff --git a/win32/replace.py b/win32/replace.py
new file mode 100644
index 0000000..0cb269a
--- /dev/null
+++ b/win32/replace.py
@@ -0,0 +1,109 @@
+#!/usr/bin/python
+#
+# Simple utility script to manipulate
+# certain types of strings in a file
+
+# This can be used in various projects where
+# there is the need to replace strings in files,
+# and is copied from GLib's $(srcroot)/win32
+
+# Author: Fan, Chun-wei
+# Date: September 03, 2014
+
+import os
+import sys
+import re
+import string
+import argparse
+
+valid_actions = ['remove-prefix',
+                 'replace-var',
+                 'replace-str',
+                 'remove-str']
+
+def replace_multi(src, dest, replace_items):
+    with open(src, 'r') as s:
+        with open(dest, 'w') as d:
+            for line in s:
+                replace_dict = dict((re.escape(key), value) \
+                               for key, value in replace_items.items())
+                replace_pattern = re.compile("|".join(replace_dict.keys()))
+                d.write(replace_pattern.sub(lambda m: \
+                        replace_dict[re.escape(m.group(0))], line))
+
+def replace(src, dest, instring, outstring):
+    replace_item = {instring: outstring}
+    replace_multi(src, dest, replace_item)
+
+def check_required_args(args, params):
+    for param in params:
+        if getattr(args, param, None) is None:
+            raise SystemExit('%s: error: --%s argument is required' % (__file__, param))
+
+def warn_ignored_args(args, params):
+    for param in params:
+        if getattr(args, param, None) is not None:
+            print('%s: warning: --%s argument is ignored' % (__file__, param))
+
+def main(argv):
+
+    parser = argparse.ArgumentParser(description='Process strings in a file.')
+    parser.add_argument('-a',
+                        '--action',
+                        help='Action to carry out.  Can be one of:\n'
+                             'remove-prefix\n'
+                             'replace-var\n'
+                             'replace-str\n'
+                             'remove-str',
+                        choices=valid_actions)
+    parser.add_argument('-i', '--input', help='Input file')
+    parser.add_argument('-o', '--output', help='Output file')
+    parser.add_argument('--instring', help='String to replace or remove')
+    parser.add_argument('--var', help='Autotools variable name to replace')
+    parser.add_argument('--outstring',
+                        help='New String to replace specified string or variable')
+    parser.add_argument('--removeprefix', help='Prefix of string to remove')
+
+    args = parser.parse_args()
+
+    input_string = ''
+    output_string = ''
+
+    # We must have action, input, output for all operations
+    check_required_args(args, ['action','input','output'])
+
+    # Build the arguments by the operation that is to be done,
+    # to be fed into replace()
+
+    # Get rid of prefixes from a string
+    if args.action == 'remove-prefix':
+        check_required_args(args, ['instring','removeprefix'])
+        warn_ignored_args(args, ['outstring','var'])
+        input_string = args.removeprefix + args.instring
+        output_string = args.instring
+
+    # Replace an m4-style variable (those surrounded by @...@)
+    if args.action == 'replace-var':
+        check_required_args(args, ['var','outstring'])
+        warn_ignored_args(args, ['instring','removeprefix'])
+        input_string = '@' + args.var + '@'
+        output_string = args.outstring
+
+    # Replace a string
+    if args.action == 'replace-str':
+        check_required_args(args, ['instring','outstring'])
+        warn_ignored_args(args, ['var','removeprefix'])
+        input_string = args.instring
+        output_string = args.outstring
+
+    # Remove a string
+    if args.action == 'remove-str':
+        check_required_args(args, ['instring'])
+        warn_ignored_args(args, ['var','outstring','removeprefix'])
+        input_string = args.instring
+        output_string = ''
+
+    replace(args.input, args.output, input_string, output_string)
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))
diff --git a/win32/rsvgpc.py b/win32/rsvgpc.py
new file mode 100644
index 0000000..d72616b
--- /dev/null
+++ b/win32/rsvgpc.py
@@ -0,0 +1,33 @@
+#!/usr/bin/python
+#
+# Utility script to generate .pc files for GLib
+# for Visual Studio builds, to be used for
+# building introspection files
+
+# Author: Fan, Chun-wei
+# Date: March 10, 2016
+
+import os
+import sys
+
+from replace import replace_multi
+from pc_base import BasePCItems
+
+def main(argv):
+    rsvg_api_ver = '2.0'
+    base_pc = BasePCItems()
+
+    base_pc.setup(argv)
+    pkg_replace_items = {'@RSVG_API_MAJOR_VERSION@': rsvg_api_ver,
+                         '@RSVG_API_VERSION@': rsvg_api_ver,
+                         ' -lm': ''}
+
+    pkg_replace_items.update(base_pc.base_replace_items)
+
+    # Generate librsvg-$(rsvg_api_ver).pc
+    replace_multi(base_pc.top_srcdir + '/librsvg.pc.in',
+                  base_pc.srcdir + '/librsvg-' + rsvg_api_ver + '.pc',
+                  pkg_replace_items)
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))