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Add diff for "deno fmt --check" (denoland#5599)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,171 @@ | ||
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license. | ||
use crate::colors; | ||
use dissimilar::{diff as difference, Chunk}; | ||
use std::fmt; | ||
use std::fmt::Write; | ||
|
||
fn fmt_add() -> String { | ||
format!("{}", colors::green_bold("+".to_string())) | ||
} | ||
|
||
fn fmt_add_text(x: String) -> String { | ||
format!("{}", colors::green(x)) | ||
} | ||
|
||
fn fmt_add_text_highlight(x: String) -> String { | ||
format!("{}", colors::white_on_green(x)) | ||
} | ||
|
||
fn fmt_rem() -> String { | ||
format!("{}", colors::red_bold("-".to_string())) | ||
} | ||
|
||
fn fmt_rem_text(x: String) -> String { | ||
format!("{}", colors::red(x)) | ||
} | ||
|
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fn fmt_rem_text_highlight(x: String) -> String { | ||
format!("{}", colors::white_on_red(x)) | ||
} | ||
|
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fn write_line_diff( | ||
diff: &mut String, | ||
orig_line: &mut usize, | ||
edit_line: &mut usize, | ||
line_number_width: usize, | ||
orig: &mut String, | ||
edit: &mut String, | ||
) -> fmt::Result { | ||
let split = orig.split('\n').enumerate(); | ||
for (i, s) in split { | ||
write!( | ||
diff, | ||
"{:0width$}{} ", | ||
*orig_line + i, | ||
colors::gray("|".to_string()), | ||
width = line_number_width | ||
)?; | ||
write!(diff, "{}", fmt_rem())?; | ||
write!(diff, "{}", s)?; | ||
writeln!(diff)?; | ||
} | ||
|
||
let split = edit.split('\n').enumerate(); | ||
for (i, s) in split { | ||
write!( | ||
diff, | ||
"{:0width$}{} ", | ||
*edit_line + i, | ||
colors::gray("|".to_string()), | ||
width = line_number_width | ||
)?; | ||
write!(diff, "{}", fmt_add())?; | ||
write!(diff, "{}", s)?; | ||
writeln!(diff)?; | ||
} | ||
|
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*orig_line += orig.split('\n').count(); | ||
*edit_line += edit.split('\n').count(); | ||
|
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orig.clear(); | ||
edit.clear(); | ||
|
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Ok(()) | ||
} | ||
|
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/// Print diff of the same file_path, before and after formatting. | ||
/// | ||
/// Diff format is loosely based on Github diff formatting. | ||
pub fn diff(orig_text: &str, edit_text: &str) -> Result<String, fmt::Error> { | ||
let lines = edit_text.split('\n').count(); | ||
let line_number_width = lines.to_string().chars().count(); | ||
|
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let mut diff = String::new(); | ||
|
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let mut text1 = orig_text.to_string(); | ||
let mut text2 = edit_text.to_string(); | ||
|
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if !text1.ends_with('\n') { | ||
writeln!(text1)?; | ||
} | ||
if !text2.ends_with('\n') { | ||
writeln!(text2)?; | ||
} | ||
|
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let mut orig_line: usize = 1; | ||
let mut edit_line: usize = 1; | ||
let mut orig: String = String::new(); | ||
let mut edit: String = String::new(); | ||
let mut changes = false; | ||
|
||
let chunks = difference(&text1, &text2); | ||
for chunk in chunks { | ||
match chunk { | ||
Chunk::Delete(s) => { | ||
let split = s.split('\n').enumerate(); | ||
for (i, s) in split { | ||
if i > 0 { | ||
orig.push_str("\n"); | ||
} | ||
orig.push_str(&fmt_rem_text_highlight(s.to_string())); | ||
} | ||
changes = true | ||
} | ||
Chunk::Insert(s) => { | ||
let split = s.split('\n').enumerate(); | ||
for (i, s) in split { | ||
if i > 0 { | ||
edit.push_str("\n"); | ||
} | ||
edit.push_str(&fmt_add_text_highlight(s.to_string())); | ||
} | ||
changes = true | ||
} | ||
Chunk::Equal(s) => { | ||
let split = s.split('\n').enumerate(); | ||
for (i, s) in split { | ||
if i > 0 { | ||
if changes { | ||
write_line_diff( | ||
&mut diff, | ||
&mut orig_line, | ||
&mut edit_line, | ||
line_number_width, | ||
&mut orig, | ||
&mut edit, | ||
)?; | ||
changes = false | ||
} else { | ||
orig.clear(); | ||
edit.clear(); | ||
orig_line += 1; | ||
edit_line += 1; | ||
} | ||
} | ||
orig.push_str(&fmt_rem_text(s.to_string())); | ||
edit.push_str(&fmt_add_text(s.to_string())); | ||
} | ||
} | ||
} | ||
} | ||
Ok(diff) | ||
} | ||
|
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#[test] | ||
fn test_diff() { | ||
let simple_console_log_unfmt = "console.log('Hello World')"; | ||
let simple_console_log_fmt = "console.log(\"Hello World\");"; | ||
assert_eq!( | ||
colors::strip_ansi_codes( | ||
&diff(simple_console_log_unfmt, simple_console_log_fmt).unwrap() | ||
), | ||
"1| -console.log('Hello World')\n1| +console.log(\"Hello World\");\n" | ||
); | ||
|
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let line_number_unfmt = "\n\n\n\nconsole.log(\n'Hello World'\n)"; | ||
let line_number_fmt = "console.log(\n\"Hello World\"\n);"; | ||
assert_eq!( | ||
colors::strip_ansi_codes(&diff(line_number_unfmt, line_number_fmt).unwrap()), | ||
"1| -\n2| -\n3| -\n4| -\n5| -console.log(\n1| +console.log(\n6| -'Hello World'\n2| +\"Hello World\"\n7| -)\n3| +);\n" | ||
) | ||
} |
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