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binary: rejigger ripgrep's handling of binary files

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This commit attempts to surface binary filtering in a slightly more
user friendly way. Namely, before, ripgrep would silently stop
searching a file if it detected a NUL byte, even if it had previously
printed a match. This can lead to the user quite reasonably assuming
that there are no more matches, since a partial search is fairly
unintuitive. (ripgrep has this behavior by default because it really
wants to NOT search binary files at all, just like it doesn't search
gitignored or hidden files.)

With this commit, if a match has already been printed and ripgrep detects
a NUL byte, then it will print a warning message indicating that the search
stopped prematurely.

Moreover, this commit adds a new flag, --binary, which causes ripgrep to
stop filtering binary files, but in a way that still avoids dumping
binary data into terminals. That is, the --binary flag makes ripgrep
behave more like grep's default behavior.

For files explicitly specified in a search, e.g., `rg foo some-file`,
then no binary filtering is applied (just like no gitignore and no
hidden file filtering is applied). Instead, ripgrep behaves as if you
gave the --binary flag for all explicitly given files.

This was a fairly invasive change, and potentially increases the UX
complexity of ripgrep around binary files. (Before, there were two
binary modes, where as now there are three.) However, ripgrep is now a
bit louder with warning messages when binary file detection might
otherwise be hiding potential matches, so hopefully this is a net
improvement.

Finally, the `-uuu` convenience now maps to `--no-ignore --hidden
--binary`, since this is closer to the actualy intent of the
`--unrestricted` flag, i.e., to reduce ripgrep's smart filtering. As a
consequence, `rg -uuu foo` should now search roughly the same number of
bytes as `grep -r foo`, and `rg -uuua foo` should search roughly the
same number of bytes as `grep -ra foo`. (The "roughly" weasel word is
used because grep's and ripgrep's binary file detection might differ
somewhat---perhaps based on buffer sizes---which can impact exactly what
is and isn't searched.)

See the numerous tests in tests/binary.rs for intended behavior.

Fixes #306, Fixes #855
This commit is contained in:
Andrew Gallant
2019-04-08 19:28:38 -04:00
parent bd222ae93f
commit a7d26c8f14
22 changed files with 1324 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

315
tests/binary.rs Normal file
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use crate::util::{Dir, TestCommand};
// This file contains a smattering of tests specifically for checking ripgrep's
// handling of binary files. There's quite a bit of discussion on this in this
// bug report: https://github.com/BurntSushi/ripgrep/issues/306
// Our haystack is the first 500 lines of Gutenberg's copy of "A Study in
// Scarlet," with a NUL byte at line 237: `abcdef\x00`.
//
// The position and size of the haystack is, unfortunately, significant. In
// particular, the NUL byte is specifically inserted at some point *after* the
// first 8192 bytes, which corresponds to the initial capacity of the buffer
// that ripgrep uses to read files. (grep for DEFAULT_BUFFER_CAPACITY.) The
// position of the NUL byte ensures that we can execute some search on the
// initial buffer contents without ever detecting any binary data. Moreover,
// when using a memory map for searching, only the first 8192 bytes are
// scanned for a NUL byte, so no binary bytes are detected at all when using
// a memory map (unless our query matches line 237).
//
// One last note: in the tests below, we use --no-mmap heavily because binary
// detection with memory maps is a bit different. Namely, NUL bytes are only
// searched for in the first few KB of the file and in a match. Normally, NUL
// bytes are searched for everywhere.
//
// TODO: Add tests for binary file detection when using memory maps.
const HAY: &'static [u8] = include_bytes!("./data/sherlock-nul.txt");
// This tests that ripgrep prints a warning message if it finds and prints a
// match in a binary file before detecting that it is a binary file. The point
// here is to notify that user that the search of the file is only partially
// complete.
//
// This applies to files that are *implicitly* searched via a recursive
// directory traversal. In particular, this results in a WARNING message being
// printed. We make our file "implicit" by doing a recursive search with a glob
// that matches our file.
rgtest!(after_match1_implicit, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "Project Gutenberg EBook", "-g", "hay",
]);
let expected = "\
hay:1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
WARNING: stopped searching binary file hay after match (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.stdout());
});
// Like after_match1_implicit, except we provide a file to search
// explicitly. This results in identical behavior, but a different message.
rgtest!(after_match1_explicit, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "Project Gutenberg EBook", "hay",
]);
let expected = "\
1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
Binary file matches (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.stdout());
});
// Like after_match1_explicit, except we feed our content on stdin.
rgtest!(after_match1_stdin, |_: Dir, mut cmd: TestCommand| {
cmd.args(&[
"--no-mmap", "-n", "Project Gutenberg EBook",
]);
let expected = "\
1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
Binary file matches (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.pipe(HAY));
});
// Like after_match1_implicit, but provides the --binary flag, which
// disables binary filtering. Thus, this matches the behavior of ripgrep as
// if the file were given explicitly.
rgtest!(after_match1_implicit_binary, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "--binary", "Project Gutenberg EBook", "-g", "hay",
]);
let expected = "\
hay:1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
Binary file hay matches (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.stdout());
});
// Like after_match1_implicit, but enables -a/--text, so no binary
// detection should be performed.
rgtest!(after_match1_implicit_text, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "--text", "Project Gutenberg EBook", "-g", "hay",
]);
let expected = "\
hay:1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
";
eqnice!(expected, cmd.stdout());
});
// Like after_match1_implicit_text, but enables -a/--text, so no binary
// detection should be performed.
rgtest!(after_match1_explicit_text, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "--text", "Project Gutenberg EBook", "hay",
]);
let expected = "\
1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
";
eqnice!(expected, cmd.stdout());
});
// Like after_match1_implicit, except this asks ripgrep to print all matching
// files.
//
// This is an interesting corner case that one might consider a bug, however,
// it's unlikely to be fixed. Namely, ripgrep probably shouldn't print `hay`
// as a matching file since it is in fact a binary file, and thus should be
// filtered out by default. However, the --files-with-matches flag will print
// out the path of a matching file as soon as a match is seen and then stop
// searching completely. Therefore, the NUL byte is never actually detected.
//
// The only way to fix this would be to kill ripgrep's performance in this case
// and continue searching the entire file for a NUL byte. (Similarly if the
// --quiet flag is set. See the next test.)
rgtest!(after_match1_implicit_path, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-l", "Project Gutenberg EBook", "-g", "hay",
]);
eqnice!("hay\n", cmd.stdout());
});
// Like after_match1_implicit_path, except this indicates that a match was
// found with no other output. (This is the same bug described above, but
// manifest as an exit code with no output.)
rgtest!(after_match1_implicit_quiet, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-q", "Project Gutenberg EBook", "-g", "hay",
]);
eqnice!("", cmd.stdout());
});
// This sets up the same test as after_match1_implicit_path, but instead of
// just printing the matching files, this includes the full count of matches.
// In this case, we need to search the entire file, so ripgrep correctly
// detects the binary data and suppresses output.
rgtest!(after_match1_implicit_count, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-c", "Project Gutenberg EBook", "-g", "hay",
]);
cmd.assert_err();
});
// Like after_match1_implicit_count, except the --binary flag is provided,
// which makes ripgrep disable binary data filtering even for implicit files.
rgtest!(after_match1_implicit_count_binary, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-c", "--binary",
"Project Gutenberg EBook",
"-g", "hay",
]);
eqnice!("hay:1\n", cmd.stdout());
});
// Like after_match1_implicit_count, except the file path is provided
// explicitly, so binary filtering is disabled and a count is correctly
// reported.
rgtest!(after_match1_explicit_count, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-c", "Project Gutenberg EBook", "hay",
]);
eqnice!("1\n", cmd.stdout());
});
// This tests that a match way before the NUL byte is shown, but a match after
// the NUL byte is not.
rgtest!(after_match2_implicit, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n",
"Project Gutenberg EBook|a medical student",
"-g", "hay",
]);
let expected = "\
hay:1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
WARNING: stopped searching binary file hay after match (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.stdout());
});
// Like after_match2_implicit, but enables -a/--text, so no binary
// detection should be performed.
rgtest!(after_match2_implicit_text, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "--text",
"Project Gutenberg EBook|a medical student",
"-g", "hay",
]);
let expected = "\
hay:1:The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
hay:236:\"And yet you say he is not a medical student?\"
";
eqnice!(expected, cmd.stdout());
});
// This tests that ripgrep *silently* quits before finding a match that occurs
// after a NUL byte.
rgtest!(before_match1_implicit, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "Heaven", "-g", "hay",
]);
cmd.assert_err();
});
// This tests that ripgrep *does not* silently quit before finding a match that
// occurs after a NUL byte when a file is explicitly searched.
rgtest!(before_match1_explicit, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "Heaven", "hay",
]);
let expected = "\
Binary file matches (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.stdout());
});
// Like before_match1_implicit, but enables the --binary flag, which
// disables binary filtering. Thus, this matches the behavior of ripgrep as if
// the file were given explicitly.
rgtest!(before_match1_implicit_binary, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "--binary", "Heaven", "-g", "hay",
]);
let expected = "\
Binary file hay matches (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.stdout());
});
// Like before_match1_implicit, but enables -a/--text, so no binary
// detection should be performed.
rgtest!(before_match1_implicit_text, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "--text", "Heaven", "-g", "hay",
]);
let expected = "\
hay:238:\"No. Heaven knows what the objects of his studies are. But here we
";
eqnice!(expected, cmd.stdout());
});
// This tests that ripgrep *silently* quits before finding a match that occurs
// before a NUL byte, but within the same buffer as the NUL byte.
rgtest!(before_match2_implicit, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "a medical student", "-g", "hay",
]);
cmd.assert_err();
});
// This tests that ripgrep *does not* silently quit before finding a match that
// occurs before a NUL byte, but within the same buffer as the NUL byte. Even
// though the match occurs before the NUL byte, ripgrep still doesn't print it
// because it has already scanned ahead to detect the NUL byte. (This matches
// the behavior of GNU grep.)
rgtest!(before_match2_explicit, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "a medical student", "hay",
]);
let expected = "\
Binary file matches (found \"\\u{0}\" byte around offset 9741)
";
eqnice!(expected, cmd.stdout());
});
// Like before_match1_implicit, but enables -a/--text, so no binary
// detection should be performed.
rgtest!(before_match2_implicit_text, |dir: Dir, mut cmd: TestCommand| {
dir.create_bytes("hay", HAY);
cmd.args(&[
"--no-mmap", "-n", "--text", "a medical student", "-g", "hay",
]);
let expected = "\
hay:236:\"And yet you say he is not a medical student?\"
";
eqnice!(expected, cmd.stdout());
});

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tests/data/sherlock-nul.txt Normal file
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The Project Gutenberg EBook of A Study In Scarlet, by Arthur Conan Doyle
This eBook is for the use of anyone anywhere at no cost and with
almost no restrictions whatsoever. You may copy it, give it away or
re-use it under the terms of the Project Gutenberg License included
with this eBook or online at www.gutenberg.org
Title: A Study In Scarlet
Author: Arthur Conan Doyle
Posting Date: July 12, 2008 [EBook #244]
Release Date: April, 1995
[Last updated: February 17, 2013]
Language: English
*** START OF THIS PROJECT GUTENBERG EBOOK A STUDY IN SCARLET ***
Produced by Roger Squires
A STUDY IN SCARLET.
By A. Conan Doyle
[1]
Original Transcriber's Note: This etext is prepared directly
from an 1887 edition, and care has been taken to duplicate the
original exactly, including typographical and punctuation
vagaries.
Additions to the text include adding the underscore character to
indicate italics, and textual end-notes in square braces.
Project Gutenberg Editor's Note: In reproofing and moving old PG
files such as this to the present PG directory system it is the
policy to reformat the text to conform to present PG Standards.
In this case however, in consideration of the note above of the
original transcriber describing his care to try to duplicate the
original 1887 edition as to typography and punctuation vagaries,
no changes have been made in this ascii text file. However, in
the Latin-1 file and this html file, present standards are
followed and the several French and Spanish words have been
given their proper accents.
Part II, The Country of the Saints, deals much with the Mormon Church.
A STUDY IN SCARLET.
PART I.
(_Being a reprint from the reminiscences of_ JOHN H. WATSON, M.D., _late
of the Army Medical Department._) [2]
CHAPTER I. MR. SHERLOCK HOLMES.
IN the year 1878 I took my degree of Doctor of Medicine of the
University of London, and proceeded to Netley to go through the course
prescribed for surgeons in the army. Having completed my studies there,
I was duly attached to the Fifth Northumberland Fusiliers as Assistant
Surgeon. The regiment was stationed in India at the time, and before
I could join it, the second Afghan war had broken out. On landing at
Bombay, I learned that my corps had advanced through the passes, and
was already deep in the enemy's country. I followed, however, with many
other officers who were in the same situation as myself, and succeeded
in reaching Candahar in safety, where I found my regiment, and at once
entered upon my new duties.
The campaign brought honours and promotion to many, but for me it had
nothing but misfortune and disaster. I was removed from my brigade and
attached to the Berkshires, with whom I served at the fatal battle of
Maiwand. There I was struck on the shoulder by a Jezail bullet, which
shattered the bone and grazed the subclavian artery. I should have
fallen into the hands of the murderous Ghazis had it not been for the
devotion and courage shown by Murray, my orderly, who threw me across a
pack-horse, and succeeded in bringing me safely to the British lines.
Worn with pain, and weak from the prolonged hardships which I had
undergone, I was removed, with a great train of wounded sufferers, to
the base hospital at Peshawar. Here I rallied, and had already improved
so far as to be able to walk about the wards, and even to bask a little
upon the verandah, when I was struck down by enteric fever, that curse
of our Indian possessions. For months my life was despaired of, and
when at last I came to myself and became convalescent, I was so weak and
emaciated that a medical board determined that not a day should be lost
in sending me back to England. I was dispatched, accordingly, in the
troopship "Orontes," and landed a month later on Portsmouth jetty, with
my health irretrievably ruined, but with permission from a paternal
government to spend the next nine months in attempting to improve it.
I had neither kith nor kin in England, and was therefore as free as
air--or as free as an income of eleven shillings and sixpence a day will
permit a man to be. Under such circumstances, I naturally gravitated to
London, that great cesspool into which all the loungers and idlers of
the Empire are irresistibly drained. There I stayed for some time at
a private hotel in the Strand, leading a comfortless, meaningless
existence, and spending such money as I had, considerably more freely
than I ought. So alarming did the state of my finances become, that
I soon realized that I must either leave the metropolis and rusticate
somewhere in the country, or that I must make a complete alteration in
my style of living. Choosing the latter alternative, I began by making
up my mind to leave the hotel, and to take up my quarters in some less
pretentious and less expensive domicile.
On the very day that I had come to this conclusion, I was standing at
the Criterion Bar, when some one tapped me on the shoulder, and turning
round I recognized young Stamford, who had been a dresser under me at
Barts. The sight of a friendly face in the great wilderness of London is
a pleasant thing indeed to a lonely man. In old days Stamford had never
been a particular crony of mine, but now I hailed him with enthusiasm,
and he, in his turn, appeared to be delighted to see me. In the
exuberance of my joy, I asked him to lunch with me at the Holborn, and
we started off together in a hansom.
"Whatever have you been doing with yourself, Watson?" he asked in
undisguised wonder, as we rattled through the crowded London streets.
"You are as thin as a lath and as brown as a nut."
I gave him a short sketch of my adventures, and had hardly concluded it
by the time that we reached our destination.
"Poor devil!" he said, commiseratingly, after he had listened to my
misfortunes. "What are you up to now?"
"Looking for lodgings." [3] I answered. "Trying to solve the problem
as to whether it is possible to get comfortable rooms at a reasonable
price."
"That's a strange thing," remarked my companion; "you are the second man
to-day that has used that expression to me."
"And who was the first?" I asked.
"A fellow who is working at the chemical laboratory up at the hospital.
He was bemoaning himself this morning because he could not get someone
to go halves with him in some nice rooms which he had found, and which
were too much for his purse."
"By Jove!" I cried, "if he really wants someone to share the rooms and
the expense, I am the very man for him. I should prefer having a partner
to being alone."
Young Stamford looked rather strangely at me over his wine-glass. "You
don't know Sherlock Holmes yet," he said; "perhaps you would not care
for him as a constant companion."
"Why, what is there against him?"
"Oh, I didn't say there was anything against him. He is a little queer
in his ideas--an enthusiast in some branches of science. As far as I
know he is a decent fellow enough."
"A medical student, I suppose?" said I.
"No--I have no idea what he intends to go in for. I believe he is well
up in anatomy, and he is a first-class chemist; but, as far as I know,
he has never taken out any systematic medical classes. His studies are
very desultory and eccentric, but he has amassed a lot of out-of-the way
knowledge which would astonish his professors."
"Did you never ask him what he was going in for?" I asked.
"No; he is not a man that it is easy to draw out, though he can be
communicative enough when the fancy seizes him."
"I should like to meet him," I said. "If I am to lodge with anyone, I
should prefer a man of studious and quiet habits. I am not strong
enough yet to stand much noise or excitement. I had enough of both in
Afghanistan to last me for the remainder of my natural existence. How
could I meet this friend of yours?"
"He is sure to be at the laboratory," returned my companion. "He either
avoids the place for weeks, or else he works there from morning to
night. If you like, we shall drive round together after luncheon."
"Certainly," I answered, and the conversation drifted away into other
channels.
As we made our way to the hospital after leaving the Holborn, Stamford
gave me a few more particulars about the gentleman whom I proposed to
take as a fellow-lodger.
"You mustn't blame me if you don't get on with him," he said; "I know
nothing more of him than I have learned from meeting him occasionally in
the laboratory. You proposed this arrangement, so you must not hold me
responsible."
"If we don't get on it will be easy to part company," I answered. "It
seems to me, Stamford," I added, looking hard at my companion, "that you
have some reason for washing your hands of the matter. Is this fellow's
temper so formidable, or what is it? Don't be mealy-mouthed about it."
"It is not easy to express the inexpressible," he answered with a laugh.
"Holmes is a little too scientific for my tastes--it approaches to
cold-bloodedness. I could imagine his giving a friend a little pinch of
the latest vegetable alkaloid, not out of malevolence, you understand,
but simply out of a spirit of inquiry in order to have an accurate idea
of the effects. To do him justice, I think that he would take it himself
with the same readiness. He appears to have a passion for definite and
exact knowledge."
"Very right too."
"Yes, but it may be pushed to excess. When it comes to beating the
subjects in the dissecting-rooms with a stick, it is certainly taking
rather a bizarre shape."
"Beating the subjects!"
"Yes, to verify how far bruises may be produced after death. I saw him
at it with my own eyes."
"And yet you say he is not a medical student?"
abcdef
"No. Heaven knows what the objects of his studies are. But here we
are, and you must form your own impressions about him." As he spoke, we
turned down a narrow lane and passed through a small side-door, which
opened into a wing of the great hospital. It was familiar ground to me,
and I needed no guiding as we ascended the bleak stone staircase and
made our way down the long corridor with its vista of whitewashed
wall and dun-coloured doors. Near the further end a low arched passage
branched away from it and led to the chemical laboratory.
This was a lofty chamber, lined and littered with countless bottles.
Broad, low tables were scattered about, which bristled with retorts,
test-tubes, and little Bunsen lamps, with their blue flickering flames.
There was only one student in the room, who was bending over a distant
table absorbed in his work. At the sound of our steps he glanced round
and sprang to his feet with a cry of pleasure. "I've found it! I've
found it," he shouted to my companion, running towards us with a
test-tube in his hand. "I have found a re-agent which is precipitated
by hoemoglobin, [4] and by nothing else." Had he discovered a gold mine,
greater delight could not have shone upon his features.
"Dr. Watson, Mr. Sherlock Holmes," said Stamford, introducing us.
"How are you?" he said cordially, gripping my hand with a strength
for which I should hardly have given him credit. "You have been in
Afghanistan, I perceive."
"How on earth did you know that?" I asked in astonishment.
"Never mind," said he, chuckling to himself. "The question now is about
hoemoglobin. No doubt you see the significance of this discovery of
mine?"
"It is interesting, chemically, no doubt," I answered, "but
practically----"
"Why, man, it is the most practical medico-legal discovery for years.
Don't you see that it gives us an infallible test for blood stains. Come
over here now!" He seized me by the coat-sleeve in his eagerness, and
drew me over to the table at which he had been working. "Let us have
some fresh blood," he said, digging a long bodkin into his finger, and
drawing off the resulting drop of blood in a chemical pipette. "Now, I
add this small quantity of blood to a litre of water. You perceive that
the resulting mixture has the appearance of pure water. The proportion
of blood cannot be more than one in a million. I have no doubt, however,
that we shall be able to obtain the characteristic reaction." As he
spoke, he threw into the vessel a few white crystals, and then added
some drops of a transparent fluid. In an instant the contents assumed a
dull mahogany colour, and a brownish dust was precipitated to the bottom
of the glass jar.
"Ha! ha!" he cried, clapping his hands, and looking as delighted as a
child with a new toy. "What do you think of that?"
"It seems to be a very delicate test," I remarked.
"Beautiful! beautiful! The old Guiacum test was very clumsy and
uncertain. So is the microscopic examination for blood corpuscles. The
latter is valueless if the stains are a few hours old. Now, this appears
to act as well whether the blood is old or new. Had this test been
invented, there are hundreds of men now walking the earth who would long
ago have paid the penalty of their crimes."
"Indeed!" I murmured.
"Criminal cases are continually hinging upon that one point. A man is
suspected of a crime months perhaps after it has been committed. His
linen or clothes are examined, and brownish stains discovered upon them.
Are they blood stains, or mud stains, or rust stains, or fruit stains,
or what are they? That is a question which has puzzled many an expert,
and why? Because there was no reliable test. Now we have the Sherlock
Holmes' test, and there will no longer be any difficulty."
His eyes fairly glittered as he spoke, and he put his hand over his
heart and bowed as if to some applauding crowd conjured up by his
imagination.
"You are to be congratulated," I remarked, considerably surprised at his
enthusiasm.
"There was the case of Von Bischoff at Frankfort last year. He would
certainly have been hung had this test been in existence. Then there was
Mason of Bradford, and the notorious Muller, and Lefevre of Montpellier,
and Samson of New Orleans. I could name a score of cases in which it
would have been decisive."
"You seem to be a walking calendar of crime," said Stamford with a
laugh. "You might start a paper on those lines. Call it the 'Police News
of the Past.'"
"Very interesting reading it might be made, too," remarked Sherlock
Holmes, sticking a small piece of plaster over the prick on his finger.
"I have to be careful," he continued, turning to me with a smile, "for I
dabble with poisons a good deal." He held out his hand as he spoke, and
I noticed that it was all mottled over with similar pieces of plaster,
and discoloured with strong acids.
"We came here on business," said Stamford, sitting down on a high
three-legged stool, and pushing another one in my direction with
his foot. "My friend here wants to take diggings, and as you were
complaining that you could get no one to go halves with you, I thought
that I had better bring you together."
Sherlock Holmes seemed delighted at the idea of sharing his rooms with
me. "I have my eye on a suite in Baker Street," he said, "which would
suit us down to the ground. You don't mind the smell of strong tobacco,
I hope?"
"I always smoke 'ship's' myself," I answered.
"That's good enough. I generally have chemicals about, and occasionally
do experiments. Would that annoy you?"
"By no means."
"Let me see--what are my other shortcomings. I get in the dumps at
times, and don't open my mouth for days on end. You must not think I am
sulky when I do that. Just let me alone, and I'll soon be right. What
have you to confess now? It's just as well for two fellows to know the
worst of one another before they begin to live together."
I laughed at this cross-examination. "I keep a bull pup," I said, "and
I object to rows because my nerves are shaken, and I get up at all sorts
of ungodly hours, and I am extremely lazy. I have another set of vices
when I'm well, but those are the principal ones at present."
"Do you include violin-playing in your category of rows?" he asked,
anxiously.
"It depends on the player," I answered. "A well-played violin is a treat
for the gods--a badly-played one----"
"Oh, that's all right," he cried, with a merry laugh. "I think we may
consider the thing as settled--that is, if the rooms are agreeable to
you."
"When shall we see them?"
"Call for me here at noon to-morrow, and we'll go together and settle
everything," he answered.
"All right--noon exactly," said I, shaking his hand.
We left him working among his chemicals, and we walked together towards
my hotel.
"By the way," I asked suddenly, stopping and turning upon Stamford, "how
the deuce did he know that I had come from Afghanistan?"
My companion smiled an enigmatical smile. "That's just his little
peculiarity," he said. "A good many people have wanted to know how he
finds things out."
"Oh! a mystery is it?" I cried, rubbing my hands. "This is very piquant.
I am much obliged to you for bringing us together. 'The proper study of
mankind is man,' you know."
"You must study him, then," Stamford said, as he bade me good-bye.
"You'll find him a knotty problem, though. I'll wager he learns more
about you than you about him. Good-bye."
"Good-bye," I answered, and strolled on to my hotel, considerably
interested in my new acquaintance.
CHAPTER II. THE SCIENCE OF DEDUCTION.
WE met next day as he had arranged, and inspected the rooms at No. 221B,
[5] Baker Street, of which he had spoken at our meeting. They
consisted of a couple of comfortable bed-rooms and a single large
airy sitting-room, cheerfully furnished, and illuminated by two broad
windows. So desirable in every way were the apartments, and so moderate
did the terms seem when divided between us, that the bargain was
concluded upon the spot, and we at once entered into possession.
That very evening I moved my things round from the hotel, and on the
following morning Sherlock Holmes followed me with several boxes and
portmanteaus. For a day or two we were busily employed in unpacking and
laying out our property to the best advantage. That done, we
gradually began to settle down and to accommodate ourselves to our new
surroundings.
Holmes was certainly not a difficult man to live with. He was quiet
in his ways, and his habits were regular. It was rare for him to be
up after ten at night, and he had invariably breakfasted and gone out
before I rose in the morning. Sometimes he spent his day at the chemical
laboratory, sometimes in the dissecting-rooms, and occasionally in long
walks, which appeared to take him into the lowest portions of the City.
Nothing could exceed his energy when the working fit was upon him; but
now and again a reaction would seize him, and for days on end he would
lie upon the sofa in the sitting-room, hardly uttering a word or moving
a muscle from morning to night. On these occasions I have noticed such
a dreamy, vacant expression in his eyes, that I might have suspected him
of being addicted to the use of some narcotic, had not the temperance
and cleanliness of his whole life forbidden such a notion.
As the weeks went by, my interest in him and my curiosity as to his
aims in life, gradually deepened and increased. His very person and
appearance were such as to strike the attention of the most casual
observer. In height he was rather over six feet, and so excessively
lean that he seemed to be considerably taller. His eyes were sharp and
piercing, save during those intervals of torpor to which I have alluded;
and his thin, hawk-like nose gave his whole expression an air of
alertness and decision. His chin, too, had the prominence and squareness
which mark the man of determination. His hands were invariably
blotted with ink and stained with chemicals, yet he was possessed of
extraordinary delicacy of touch, as I frequently had occasion to observe
when I watched him manipulating his fragile philosophical instruments.
The reader may set me down as a hopeless busybody, when I confess how
much this man stimulated my curiosity, and how often I endeavoured
to break through the reticence which he showed on all that concerned
himself. Before pronouncing judgment, however, be it remembered, how
objectless was my life, and how little there was to engage my attention.
My health forbade me from venturing out unless the weather was
exceptionally genial, and I had no friends who would call upon me and
break the monotony of my daily existence. Under these circumstances, I
eagerly hailed the little mystery which hung around my companion, and
spent much of my time in endeavouring to unravel it.
He was not studying medicine. He had himself, in reply to a question,
confirmed Stamford's opinion upon that point. Neither did he appear to
have pursued any course of reading which might fit him for a degree in
science or any other recognized portal which would give him an entrance
into the learned world. Yet his zeal for certain studies was remarkable,
and within eccentric limits his knowledge was so extraordinarily ample
and minute that his observations have fairly astounded me. Surely no man
would work so hard or attain such precise information unless he had some
definite end in view. Desultory readers are seldom remarkable for the
exactness of their learning. No man burdens his mind with small matters
unless he has some very good reason for doing so.
His ignorance was as remarkable as his knowledge. Of contemporary
literature, philosophy and politics he appeared to know next to nothing.
Upon my quoting Thomas Carlyle, he inquired in the naivest way who he
might be and what he had done. My surprise reached a climax, however,
when I found incidentally that he was ignorant of the Copernican Theory
and of the composition of the Solar System. That any civilized human
being in this nineteenth century should not be aware that the earth
travelled round the sun appeared to be to me such an extraordinary fact
that I could hardly realize it.
"You appear to be astonished," he said, smiling at my expression of
surprise. "Now that I do know it I shall do my best to forget it."
"To forget it!"
"You see," he explained, "I consider that a man's brain originally is
like a little empty attic, and you have to stock it with such furniture
as you choose. A fool takes in all the lumber of every sort that he
comes across, so that the knowledge which might be useful to him gets
crowded out, or at best is jumbled up with a lot of other things so that
he has a difficulty in laying his hands upon it. Now the skilful workman
is very careful indeed as to what he takes into his brain-attic. He will
have nothing but the tools which may help him in doing his work, but of
these he has a large assortment, and all in the most perfect order. It
is a mistake to think that that little room has elastic walls and can
distend to any extent. Depend upon it there comes a time when for every
addition of knowledge you forget something that you knew before. It is
of the highest importance, therefore, not to have useless facts elbowing
out the useful ones."

2
tests/feature.rs
View File

@@ -72,7 +72,7 @@ rgtest!(f7_stdin, |dir: Dir, mut cmd: TestCommand| {
sherlock:For the Doctor Watsons of this world, as opposed to the Sherlock
sherlock:be, to a very large extent, the result of luck. Sherlock Holmes
";
eqnice!(expected, cmd.arg("-f-").pipe("Sherlock"));
eqnice!(expected, cmd.arg("-f-").pipe(b"Sherlock"));
});
// See: https://github.com/BurntSushi/ripgrep/issues/20

34
tests/misc.rs
View File

@@ -752,12 +752,11 @@ rgtest!(unrestricted2, |dir: Dir, mut cmd: TestCommand| {
rgtest!(unrestricted3, |dir: Dir, mut cmd: TestCommand| {
dir.create("sherlock", SHERLOCK);
dir.create("file", "foo\x00bar\nfoo\x00baz\n");
dir.create("hay", "foo\x00bar\nfoo\x00baz\n");
cmd.arg("-uuu").arg("foo");
let expected = "\
file:foo\x00bar
file:foo\x00baz
Binary file hay matches (found \"\\u{0}\" byte around offset 3)
";
eqnice!(expected, cmd.stdout());
});
@@ -950,10 +949,35 @@ rgtest!(compressed_failing_gzip, |dir: Dir, mut cmd: TestCommand| {
cmd.assert_non_empty_stderr();
});
rgtest!(binary_nosearch, |dir: Dir, mut cmd: TestCommand| {
rgtest!(binary_convert, |dir: Dir, mut cmd: TestCommand| {
dir.create("file", "foo\x00bar\nfoo\x00baz\n");
cmd.arg("foo").arg("file");
cmd.arg("--no-mmap").arg("foo").arg("file");
let expected = "\
Binary file matches (found \"\\u{0}\" byte around offset 3)
";
eqnice!(expected, cmd.stdout());
});
rgtest!(binary_convert_mmap, |dir: Dir, mut cmd: TestCommand| {
dir.create("file", "foo\x00bar\nfoo\x00baz\n");
cmd.arg("--mmap").arg("foo").arg("file");
let expected = "\
Binary file matches (found \"\\u{0}\" byte around offset 3)
";
eqnice!(expected, cmd.stdout());
});
rgtest!(binary_quit, |dir: Dir, mut cmd: TestCommand| {
dir.create("file", "foo\x00bar\nfoo\x00baz\n");
cmd.arg("--no-mmap").arg("foo").arg("-gfile");
cmd.assert_err();
});
rgtest!(binary_quit_mmap, |dir: Dir, mut cmd: TestCommand| {
dir.create("file", "foo\x00bar\nfoo\x00baz\n");
cmd.arg("--mmap").arg("foo").arg("-gfile");
cmd.assert_err();
});

2
tests/multiline.rs
View File

@@ -88,7 +88,7 @@ rgtest!(stdin, |_: Dir, mut cmd: TestCommand| {
1:For the Doctor Watsons of this world, as opposed to the Sherlock
2:Holmeses, success in the province of detective work must always
";
eqnice!(expected, cmd.pipe(SHERLOCK));
eqnice!(expected, cmd.pipe(SHERLOCK.as_bytes()));
});
// Test that multiline search and contextual matches work.

2
tests/tests.rs
View File

@@ -7,6 +7,8 @@ mod hay;
// Utilities for making tests nicer to read and easier to write.
mod util;
// Tests for ripgrep's handling of binary files.
mod binary;
// Tests related to most features in ripgrep. If you're adding something new
// to ripgrep, tests should probably go in here.
mod feature;

4
tests/util.rs
View File

@@ -297,7 +297,7 @@ impl TestCommand {
}
/// Pipe `input` to a command, and collect the output.
pub fn pipe(&mut self, input: &str) -> String {
pub fn pipe(&mut self, input: &[u8]) -> String {
self.cmd.stdin(process::Stdio::piped());
self.cmd.stdout(process::Stdio::piped());
self.cmd.stderr(process::Stdio::piped());
@@ -309,7 +309,7 @@ impl TestCommand {
let mut stdin = child.stdin.take().expect("expected standard input");
let input = input.to_owned();
let worker = thread::spawn(move || {
write!(stdin, "{}", input)
stdin.write_all(&input)
});
let output = self.expect_success(child.wait_with_output().unwrap());