From 16755b26e2540aa7c26ca07ba8b8b44acb90f12f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Renault?= <clement@meilisearch.com>
Date: Wed, 2 Dec 2020 10:43:22 +0100
Subject: [PATCH] Make the export words FST export infos subcommand outputs to
 stdout

---
 src/subcommand/infos.rs | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/src/subcommand/infos.rs b/src/subcommand/infos.rs
index 1093c0f48..54ce620cb 100644
--- a/src/subcommand/infos.rs
+++ b/src/subcommand/infos.rs
@@ -135,15 +135,11 @@ enum Command {
         word2: String,
     },
 
-    /// Outputs the words FST to disk.
+    /// Outputs the words FST to standard output.
     ///
     /// One can use the FST binary helper to dissect and analyze it,
     /// you can install it using `cargo install fst-bin`.
-    ExportWordsFst {
-        /// The path where the FST will be written.
-        #[structopt(short, long, default_value = "words.fst")]
-        output: PathBuf,
-    },
+    ExportWordsFst,
 
     /// Outputs the documents as JSON lines to the standard output.
     ///
@@ -187,7 +183,7 @@ pub fn run(opt: Opt) -> anyhow::Result<()> {
         WordPairProximitiesDocids { full_display, word1, word2 } => {
             word_pair_proximities_docids(&index, &rtxn, !full_display, word1, word2)
         },
-        ExportWordsFst { output } => export_words_fst(&index, &rtxn, output),
+        ExportWordsFst => export_words_fst(&index, &rtxn),
         ExportDocuments => export_documents(&index, &rtxn),
         PatchToNewExternalIds => {
             drop(rtxn);
@@ -485,15 +481,15 @@ fn facet_stats(index: &Index, rtxn: &heed::RoTxn, field_name: String) -> anyhow:
     Ok(())
 }
 
-fn export_words_fst(index: &Index, rtxn: &heed::RoTxn, output: PathBuf) -> anyhow::Result<()> {
-    use std::fs::File;
+fn export_words_fst(index: &Index, rtxn: &heed::RoTxn) -> anyhow::Result<()> {
     use std::io::Write as _;
 
-    let mut output = File::create(&output)
-        .with_context(|| format!("failed to create {} file", output.display()))?;
-
+    let mut stdout = io::stdout();
     let words_fst = index.words_fst(rtxn)?;
-    output.write_all(words_fst.as_fst().as_bytes())?;
+    stdout.write_all(words_fst.as_fst().as_bytes())?;
+
+    Ok(())
+}
 
 fn export_documents(index: &Index, rtxn: &heed::RoTxn) -> anyhow::Result<()> {
     use std::io::{BufWriter, Write as _};