X-Git-Url: http://nitlanguage.org

diff --git a/src/toolcontext.nit b/src/toolcontext.nit
index 92a4824..8196aeb 100644
--- a/src/toolcontext.nit
+++ b/src/toolcontext.nit
@@ -41,9 +41,21 @@ class Message
 
 	# The human-readable description of the message.
 	#
-	# It should be short and fit on a single line.
-	# It should also have meaningful information first in case
-	# on truncation by an IDE for instance.
+	# eg. "Error: cannot find method `foo`."
+	#
+	# A good message should:
+	#
+	# * start with a message type like "Error:", "Syntax Error:", "Warning:".
+	#   The type is capitalized and terminated by a column.
+	#   The rest on the message starts with a lowercase letter and is terminated with a dot.
+	#
+	# * be short and fit on a single line.
+	#
+	# * have meaningful information first.
+	#   This helps the reader and remain usable
+	#   when truncated, by an IDE for instance.
+	#
+	# * enclose identifiers, keywords and pieces of code with back-quotes.
 	var text: String
 
 	# Comparisons are made on message locations.
@@ -54,6 +66,11 @@ class Message
 		return location.as(not null) < other.location.as(not null)
 	end
 
+	redef fun ==(other): Bool do
+		if not other isa Message then return false
+		return location == other.location and tag == other.tag and text == other.text
+	end
+
 	redef fun to_s: String
 	do
 		var l = location
@@ -91,6 +108,24 @@ class Message
 	end
 end
 
+redef class Location
+	# Errors and warnings associated to this location.
+	var messages: nullable Array[Message]
+
+	# Add a message to `self`
+	#
+	# See `messages`
+	private fun add_message(m: Message)
+	do
+		var ms = messages
+		if ms == null then
+			ms = new Array[Message]
+			messages = ms
+		end
+		ms.add m
+	end
+end
+
 # Global context for tools
 class ToolContext
 	# Number of errors
@@ -176,14 +211,22 @@ class ToolContext
 	end
 
 	# Display an error
-	fun error(l: nullable Location, s: String)
+	#
+	# Return the message (to add information)
+	fun error(l: nullable Location, s: String): Message
 	do
-		messages.add(new Message(l,null,s))
+		var m = new Message(l,null,s)
+		if messages.has(m) then return m
+		if l != null then l.add_message m
+		messages.add m
 		error_count = error_count + 1
 		if opt_stop_on_first_error.value then check_errors
+		return m
 	end
 
 	# Add an error, show errors and quit
+	#
+	# Because the program will quit, nothing is returned.
 	fun fatal_error(l: nullable Location, s: String)
 	do
 		error(l,s)
@@ -200,14 +243,20 @@ class ToolContext
 	# * They always are real issues (no false positive)
 	#
 	# First-level warnings are displayed by default (except if option `-q` is given).
-	fun warning(l: nullable Location, tag: String, text: String)
+	#
+	# Return the message (to add information) or null if the warning is disabled
+	fun warning(l: nullable Location, tag: String, text: String): nullable Message
 	do
-		if opt_warning.value.has("no-{tag}") then return
-		if not opt_warning.value.has(tag) and opt_warn.value == 0 then return
-		if is_warning_blacklisted(l, tag) then return
-		messages.add(new Message(l, tag, text))
+		if opt_warning.value.has("no-{tag}") then return null
+		if not opt_warning.value.has(tag) and opt_warn.value == 0 then return null
+		if is_warning_blacklisted(l, tag) then return null
+		var m = new Message(l, tag, text)
+		if messages.has(m) then return null
+		if l != null then l.add_message m
+		messages.add m
 		warning_count = warning_count + 1
 		if opt_stop_on_first_error.value then check_errors
+		return m
 	end
 
 	# Display a second-level warning.
@@ -223,14 +272,20 @@ class ToolContext
 	#
 	# In order to prevent warning inflation à la Java, second-level warnings are not displayed by
 	# default and require an additional option `-W`.
-	fun advice(l: nullable Location, tag: String, text: String)
+	#
+	# Return the message (to add information) or null if the warning is disabled
+	fun advice(l: nullable Location, tag: String, text: String): nullable Message
 	do
-		if opt_warning.value.has("no-{tag}") then return
-		if not opt_warning.value.has(tag) and opt_warn.value <= 1 then return
-		if is_warning_blacklisted(l, tag) then return
-		messages.add(new Message(l, tag, text))
+		if opt_warning.value.has("no-{tag}") then return null
+		if not opt_warning.value.has(tag) and opt_warn.value <= 1 then return null
+		if is_warning_blacklisted(l, tag) then return null
+		var m = new Message(l, tag, text)
+		if messages.has(m) then return null
+		if l != null then l.add_message m
+		messages.add m
 		warning_count = warning_count + 1
 		if opt_stop_on_first_error.value then check_errors
+		return m
 	end
 
 	# Display an info
@@ -310,6 +365,9 @@ class ToolContext
 	# Option --stop-on-first-error
 	var opt_stop_on_first_error = new OptionBool("Stop on first error", "--stop-on-first-error")
 
+	# Option --keep-going
+	var opt_keep_going = new OptionBool("Continue after errors, whatever the consequences", "--keep-going")
+
 	# Option --no-color
 	var opt_no_color = new OptionBool("Do not use color to display errors and warnings", "--no-color")
 
@@ -324,7 +382,7 @@ class ToolContext
 
 	init
 	do
-		option_context.add_option(opt_warn, opt_warning, opt_quiet, opt_stop_on_first_error, opt_no_color, opt_log, opt_log_dir, opt_nit_dir, opt_help, opt_version, opt_set_dummy_tool, opt_verbose, opt_bash_completion, opt_stub_man)
+		option_context.add_option(opt_warn, opt_warning, opt_quiet, opt_stop_on_first_error, opt_keep_going, opt_no_color, opt_log, opt_log_dir, opt_nit_dir, opt_help, opt_version, opt_set_dummy_tool, opt_verbose, opt_bash_completion, opt_stub_man)
 
 		# Hide some internal options
 		opt_stub_man.hidden = true
@@ -430,6 +488,8 @@ The Nit language documentation and the source code of its tools and libraries ma
 		# Set verbose level
 		verbose_level = opt_verbose.value
 
+		if opt_keep_going.value then keep_going = true
+
 		if self.opt_quiet.value then self.opt_warn.value = 0
 
 		if opt_log_dir.value != null then log_directory = opt_log_dir.value.as(not null)
@@ -467,7 +527,7 @@ The Nit language documentation and the source code of its tools and libraries ma
 		var res = opt_nit_dir.value
 		if res != null then
 			if not check_nit_dir(res) then
-				fatal_error(null, "Fatal Error: the value of --nit-dir does not seem to be a valid base Nit directory: {res}")
+				fatal_error(null, "Fatal Error: the value of --nit-dir does not seem to be a valid base Nit directory: {res}.")
 			end
 			return res
 		end
@@ -476,7 +536,7 @@ The Nit language documentation and the source code of its tools and libraries ma
 		res = "NIT_DIR".environ
 		if not res.is_empty then
 			if not check_nit_dir(res) then
-				fatal_error(null, "Fatal Error: the value of NIT_DIR does not seem to be a valid base Nit directory: {res}")
+				fatal_error(null, "Fatal Error: the value of NIT_DIR does not seem to be a valid base Nit directory: {res}.")
 			end
 			return res
 		end
@@ -500,7 +560,7 @@ The Nit language documentation and the source code of its tools and libraries ma
 			if check_nit_dir(res) then return res.simplify_path
 		end
 
-		fatal_error(null, "Fatal Error: Cannot locate a valid base nit directory. It is quite unexpected. Try to set the environment variable `NIT_DIR` or to use the `--nit-dir` option.")
+		fatal_error(null, "Fatal Error: cannot locate a valid base Nit directory. It is quite unexpected. Try to set the environment variable `NIT_DIR` or to use the `--nit-dir` option.")
 		abort
 	end