1 files changed, 99 insertions, 0 deletions
diff --git a/packages/gitbook/src/utils/error.js b/packages/gitbook/src/utils/error.js
new file mode 100644
index 0000000..925b5ff
--- /dev/null
+++ b/packages/gitbook/src/utils/error.js
@@ -0,0 +1,99 @@
+const is = require('is');
+
+const TypedError = require('error/typed');
+const WrappedError = require('error/wrapped');
+
+
+// Enforce as an Error object, and cleanup message
+function enforce(err) {
+    if (is.string(err)) err = new Error(err);
+    err.message = err.message.replace(/^Error: /, '');
+
+    return err;
+}
+
+// Random error wrappers during parsing/generation
+const ParsingError = WrappedError({
+    message: 'Parsing Error: {origMessage}',
+    type: 'parse'
+});
+const OutputError = WrappedError({
+    message: 'Output Error: {origMessage}',
+    type: 'generate'
+});
+
+// A file does not exists
+const FileNotFoundError = TypedError({
+    type: 'file.not-found',
+    message: 'No "{filename}" file (or is ignored)',
+    filename: null
+});
+
+// A file cannot be parsed
+const FileNotParsableError = TypedError({
+    type: 'file.not-parsable',
+    message: '"{filename}" file cannot be parsed',
+    filename: null
+});
+
+// A file is outside the scope
+const FileOutOfScopeError = TypedError({
+    type: 'file.out-of-scope',
+    message: '"{filename}" not in "{root}"',
+    filename: null,
+    root: null,
+    code: 'EACCESS'
+});
+
+// A file is outside the scope
+const RequireInstallError = TypedError({
+    type: 'install.required',
+    message: '"{cmd}" is not installed.\n{install}',
+    cmd: null,
+    code: 'ENOENT',
+    install: ''
+});
+
+// Error for nunjucks templates
+const TemplateError = WrappedError({
+    message: 'Error compiling template "{filename}": {origMessage}',
+    type: 'template',
+    filename: null
+});
+
+// Error for nunjucks templates
+const PluginError = WrappedError({
+    message: 'Error with plugin "{plugin}": {origMessage}',
+    type: 'plugin',
+    plugin: null
+});
+
+// Error with the book's configuration
+const ConfigurationError = WrappedError({
+    message: 'Error with book\'s configuration: {origMessage}',
+    type: 'configuration'
+});
+
+// Error during ebook generation
+const EbookError = WrappedError({
+    message: 'Error during ebook generation: {origMessage}\n{stdout}',
+    type: 'ebook',
+    stdout: ''
+});
+
+module.exports = {
+    enforce,
+
+    ParsingError,
+    OutputError,
+    RequireInstallError,
+
+    FileNotParsableError,
+    FileNotFoundError,
+    FileOutOfScopeError,
+
+    TemplateError,
+    PluginError,
+    ConfigurationError,
+    EbookError
+};