Remplacement de buildsongbook par la classe SongbookBuilder (#21)

songbook

@@ -12,7 +12,7 @@ import os.path
 import textwrap
 import sys
 
-from songbook_core.build import buildsongbook, DEFAULT_STEPS
+from songbook_core.build import SongbookBuilder, DEFAULT_STEPS
 from songbook_core import __STR_VERSION__
 from songbook_core import errors
 
@@ -105,13 +105,11 @@ def main():
         songbook['datadir'] = os.path.dirname(songbook_path)
 
     try:
-        buildsongbook(
-                songbook,
-                basename,
-                steps=options.steps,
-                interactive=True,
-                logger=logger,
-                )
+        sb_builder = SongbookBuilder(songbook, basename, logger=logger)
+        sb_builder.interactive = True
+        sb_builder.unsafe = True
+
+        sb_builder.build_steps(options.steps)
     except errors.SongbookError as error:
         logger.error(error)
         sys.exit(1)

songbook_core/build.py

@@ -24,6 +24,18 @@ DEFAULT_AUTHWORDS = {
         "sep": ["and"],
         }
 DEFAULT_STEPS = ['tex', 'pdf', 'sbx', 'pdf', 'clean']
+GENERATED_EXTENSIONS = [
+        "_auth.sbx",
+        "_auth.sxd",
+        ".aux",
+        ".log",
+        ".out",
+        ".sxc",
+        ".tex",
+        "_title.sbx",
+        "_title.sxd",
+        ]
+
 
 
 # pylint: disable=too-few-public-methods
@@ -123,58 +135,39 @@ class Songbook(object):
         renderer.render_tex(output, context)
 
 
-def clean(basename):
-    """Clean (some) temporary files used during compilation.
-
-    Depending of the LaTeX modules used in the template, there may be others
-    that are not deleted by this function."""
-    generated_extensions = [
-            "_auth.sbx",
-            "_auth.sxd",
-            ".aux",
-            ".log",
-            ".out",
-            ".sxc",
-            ".tex",
-            "_title.sbx",
-            "_title.sxd",
-            ]
+class SongbookBuilder(object):
+    """Provide methods to compile a songbook."""
 
-    for ext in generated_extensions:
-        if os.path.isfile(basename + ext):
-            try:
-                os.unlink(basename + ext)
-            except Exception as exception:
-                raise errors.CleaningError(basename + ext, exception)
+    # Representation of the .sb songbook configuration file.
+    songbook = {}
+    # Basename of the songbook to be built.
+    basename = None
+    # if False, do not expect anything from stdin.
+    interactive = False
+    # if True, allow unsafe option, like adding the --shell-escape to pdflatex
+    unsafe = False
+    # Options to add to pdflatex
+    _pdflatex_options = []
+    # Dictionary of functions that have been called by self._run_once(). Keys
+    # are function; values are return values of functions.
+    _called_functions = {}
 
+    def __init__(self, raw_songbook, basename, logger):
+        self.songbook = Songbook(raw_songbook, basename)
+        self.basename = basename
+        self.logger = logger
 
-def buildsongbook(
-        raw_songbook,
-        basename,
-        steps=None,
-        interactive=False,
-        logger=logging.getLogger(),
-        ):
-    """Build a songbook
+    def _run_once(self, function, *args, **kwargs):
+        """Run function if it has not been run yet.
 
-    Arguments:
-    - raw_songbook: Python representation of the .sb songbook configuration
-      file.
-    - steps: list of steps to perform to compile songbook. Available steps are:
-      - tex: build .tex file from templates;
-      - pdf: compile .tex using pdflatex;
-      - sbx: compile song and author indexes;
-      - clean: remove temporary files,
-      - any string beginning with a sharp sign (#): it is interpreted as a
-        command to run in a shell.
-    - basename: basename of the songbook to be built.
-    - interactive: in False, do not expect anything from stdin.
+        If it as, return the previous return value.
         """
+        if function not in self._called_functions:
+            self._called_functions[function] = function(*args, **kwargs)
+        return self._called_functions[function]
 
-    if steps is None:
-        steps = DEFAULT_STEPS
-
-    songbook = Songbook(raw_songbook, basename)
+    def _set_latex(self):
+        """Set TEXINPUTS and LaTeX options."""
         if not 'TEXINPUTS' in os.environ.keys():
             os.environ['TEXINPUTS'] = ''
         os.environ['TEXINPUTS'] += os.pathsep + os.path.join(
@@ -182,43 +175,85 @@ def buildsongbook(
                 'latex',
                 )
         os.environ['TEXINPUTS'] += os.pathsep + os.path.join(
-            songbook.config['datadir'],
+                self.songbook.config['datadir'],
                 'latex',
                 )
 
-    # pdflatex options
-    pdflatex_options = []
-    pdflatex_options.append("--shell-escape")  # Lilypond compilation
-    if not interactive:
-        pdflatex_options.append("-halt-on-error")
+        if self.unsafe:
+            self._pdflatex_options.append("--shell-escape")
+        if not self.interactive:
+            self._pdflatex_options.append("-halt-on-error")
+
+    def build_steps(self, steps=None):
+        """Perform steps on the songbook by calling relevant self.build_*()
+
+        Arguments:
+        - steps: list of steps to perform to compile songbook. Available steps
+          are:
+          - tex: build .tex file from templates;
+          - pdf: compile .tex using pdflatex;
+          - sbx: compile song and author indexes;
+          - clean: remove temporary files,
+          - any string beginning with a sharp sign (#): it is interpreted as a
+            command to run in a shell.
+        """
+        if not steps:
+            steps = DEFAULT_STEPS
 
-    # Compilation
         for step in steps:
             if step == 'tex':
-            # Building .tex file from templates
-            with codecs.open("{}.tex".format(basename), 'w', 'utf-8') as output:
-                songbook.write_tex(output)
+                self.build_tex()
             elif step == 'pdf':
-            if subprocess.call(["pdflatex"] + pdflatex_options + [basename]):
-                raise errors.LatexCompilationError(basename)
+                self.build_pdf()
             elif step == 'sbx':
-            # Make index
-            sxd_files = glob.glob("%s_*.sxd" % basename)
+                self.build_sbx()
+            elif step == 'clean':
+                self.clean()
+            elif step.startswith("%"):
+                self.build_custom(step[1:])
+            else:
+                # Unknown step name
+                raise errors.UnknownStep(step)
+
+    def build_tex(self):
+        """Build .tex file from templates"""
+        self._run_once(self._set_latex)
+        with codecs.open(
+                "{}.tex".format(self.basename), 'w', 'utf-8',
+                ) as output:
+            self.songbook.write_tex(output)
+
+    def build_pdf(self):
+        """Build .pdf file from .tex file"""
+        if subprocess.call(
+                ["pdflatex"] + self._pdflatex_options + [self.basename]
+                ):
+            raise errors.LatexCompilationError(self.basename)
+
+    def build_sbx(self):
+        """Make index"""
+        sxd_files = glob.glob("%s_*.sxd" % self.basename)
         for sxd_file in sxd_files:
-                logger.info("processing " + sxd_file)
+            self.logger.info("processing " + sxd_file)
             idx = process_sxd(sxd_file)
-                index_file = open(sxd_file[:-3] + "sbx", "w")
+            with open(sxd_file[:-3] + "sbx", "w") as index_file:
                 index_file.write(idx.entries_to_str().encode('utf8'))
-                index_file.close()
-        elif step == 'clean':
-            # Cleaning
-            clean(basename)
-        elif step.startswith("%"):
-            # Shell command
-            command = step[1:]
+
+    @staticmethod
+    def build_custom(command):
+        """Run a shell command"""
         exit_code = subprocess.call(command, shell=True)
         if exit_code:
             raise errors.StepCommandError(command, exit_code)
-        else:
-            # Unknown step name
-            raise errors.UnknownStep(step)
+
+    def clean(self):
+        """Clean (some) temporary files used during compilation.
+
+        Depending of the LaTeX modules used in the template, there may be others
+        that are not deleted by this function."""
+        for ext in GENERATED_EXTENSIONS:
+            if os.path.isfile(self.basename + ext):
+                try:
+                    os.unlink(self.basename + ext)
+                except Exception as exception:
+                    raise errors.CleaningError(self.basename + ext, exception)