From 3d313c5956510a807c2ce7d1ffd9c3bfbb708444 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Mon, 19 May 2025 14:47:03 -0400
Subject: Add --prefix flag

---
 CHANGES.md      | 1 +
 docs/tomo.1.md  | 3 +++
 man/man1/tomo.1 | 3 +++
 src/tomo.c      | 7 +++++++
 4 files changed, 14 insertions(+)

diff --git a/CHANGES.md b/CHANGES.md
index 8524fd9d..f071f7fa 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -6,6 +6,7 @@
   configuration for module aliases.
 - Programs can use `--version` as a CLI flag to print a Tomo program's version
   number and exit.
+- Added `tomo --prefix` to print the Tomo install prefix.
 - Added Path.sibling()
 
 ## v0.2
diff --git a/docs/tomo.1.md b/docs/tomo.1.md
index 7ccf0397..4207de6a 100644
--- a/docs/tomo.1.md
+++ b/docs/tomo.1.md
@@ -62,5 +62,8 @@ C code, which is then compiled using a C compiler of your choice.
 `--version`
 : Print the compiler version and exit.
 
+`--prefix`
+: Print the Tomo installation prefix and exit.
+
 `-r`, `--run`
 : Run an installed tomo program from `~/.local/share/tomo_vX.Y/installed`.
diff --git a/man/man1/tomo.1 b/man/man1/tomo.1
index 32b366a6..4b4f16bd 100644
--- a/man/man1/tomo.1
+++ b/man/man1/tomo.1
@@ -60,6 +60,9 @@ Print extra verbose output.
 \f[B]\-\-version\f[R]
 Print the compiler version and exit.
 .TP
+\f[B]\-\-prefix\f[R]
+Print the Tomo installation prefix and exit.
+.TP
 \f[B]\-r\f[R], \f[B]\-\-run\f[R]
 Run an installed tomo program from
 \f[B]\[ti]/.local/share/tomo_vX.Y/installed\f[R].
diff --git a/src/tomo.c b/src/tomo.c
index 24a407a4..a2ccc84a 100644
--- a/src/tomo.c
+++ b/src/tomo.c
@@ -64,6 +64,7 @@ static OptionalList_t files = NONE_LIST,
 static OptionalBool_t verbose = false,
                       quiet = false,
                       show_parse_tree = false,
+                      show_prefix = false,
                       stop_at_transpile = false,
                       stop_at_obj_compilation = false,
                       compile_exe = false,
@@ -189,6 +190,7 @@ int main(int argc, char *argv[])
         {"v", false, &Bool$info, &verbose},
         {"parse", false, &Bool$info, &show_parse_tree},
         {"p", false, &Bool$info, &show_parse_tree},
+        {"prefix", false, &Bool$info, &show_prefix},
         {"quiet", false, &Bool$info, &quiet},
         {"q", false, &Bool$info, &quiet},
         {"transpile", false, &Bool$info, &stop_at_transpile},
@@ -213,6 +215,11 @@ int main(int argc, char *argv[])
         {"m", false, &Bool$info, &source_mapping},
     );
 
+    if (show_prefix) {
+        print(TOMO_PREFIX);
+        return 0;
+    }
+
     bool is_gcc = (system(String(cc, " -v 2>&1 | grep -q 'gcc version'")) == 0);
     if (is_gcc) {
         cflags = Texts(cflags, Text(" -fsanitize=signed-integer-overflow -fno-sanitize-recover"
-- 
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